Re: [MBZ] Brake Light on (was Best Axle Choice)

[MG via Mercedes]

Try taking the switch out. The brake fluid probably won't leak. 
See if the switch will cause the light to light up with it 
connected and grounded to the cylinder or other good ground. If 
so then the switch is bad. If not then the piston is probably not 
centered. Try to get a look into the hole and see if you see a 
groove and try to gently pry it into a centered position without 
buggering it up at the edges.


Mind you this is all conjecture as I have never had one of these 
so I have no idea if this is the way the thing works, just 
thinking that's the way I would engineer such a system and the 
way I would try and figure out the problem if I had one.


Manfred

tyee165 via Mercedes wrote:

Yes. I had the original master cylinder totally apart and if I remember 
correctly there is a 2nd smaller bore with a piston that has a notch that 
causes the switch to move back or forward sort of like a toggle. I ended up 
with a new or rebuilt master cylinder but I think I reused the electric switch. 
That may be the issue. No idea if it is available. When this subject came up I 
wondered if I might also have a switch on the brake pedal too.

Sent from my Galaxy Tab® A
 Original message From: Max Dillon via Mercedes <mercedes@okiebenz.com> Date: 2017-01-18  6:17 PM  (GMT-06:00) To: Mercedes Discussion List <mercedes@okiebenz.com> Cc: Max Dillon <dillonm...@gmail.com> Subject: Re: [MBZ] Brake Light on (was Best Axle Choice) 
If I recall correctly, Randy has brought up this issue before.  His car's master cylinder has an extra sensor for the front-rear circuit's pressure differential, and that is the warning light.  


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Re: [MBZ] Brake Light on (was Best Axle Choice)

[tyee165 via Mercedes]

Yes. I had the original master cylinder totally apart and if I remember 
correctly there is a 2nd smaller bore with a piston that has a notch that 
causes the switch to move back or forward sort of like a toggle. I ended up 
with a new or rebuilt master cylinder but I think I reused the electric switch. 
That may be the issue. No idea if it is available. When this subject came up I 
wondered if I might also have a switch on the brake pedal too.

Sent from my Galaxy Tab® A
 Original message From: Max Dillon via Mercedes 
<mercedes@okiebenz.com> Date: 2017-01-18  6:17 PM  (GMT-06:00) To: Mercedes 
Discussion List <mercedes@okiebenz.com> Cc: Max Dillon <dillonm...@gmail.com> 
Subject: Re: [MBZ] Brake Light on (was Best Axle Choice) 
If I recall correctly, Randy has brought up this issue before.  His car's 
master cylinder has an extra sensor for the front-rear circuit's pressure 
differential, and that is the warning light.  
-- 
Max Dillon
Charleston SC
'87 300TD
'95 E300

On January 18, 2017 4:11:01 PM EST, MG via Mercedes <mercedes@okiebenz.com> 
wrote:
>It is probably connected to the parking brake warning switch, 
>(doesn't need much for the peddle to keep the switch closed. 1/4" 
>or so is enough) and in the 123s at least it also connects to the 
>reservoir level sensor. Pressing on the button on the top of the 
>reservoir will turn on the light. Sometimes the level float or 
>the button test contacts get stuck in the on position. Might 
>check that possibility if yours has that.
>
>Manfred
>
>Randy Bennell via Mercedes wrote:
>> I appear to have triggered it a few years back when I decided to put
>new 
>> brake fluid in and bled the brakes to clear the old fluid out.
>> I could not get the light to go out after and thought that maybe the 
>> trigger to it had become stuck in the master cylinder since opening
>the 
>> bleed screw and applying brake pressure woudl be similar to a failed 
>> line etc.
>> I subsequently ( a couple of years later) suffered a failure of the 
>> master cylinder and replaced it. Still cannot get the brake light to
>go 
>> out despite careful cleaning of the resevoir etc. Figure it is likely
>
>> something that has gone wrong with the switch on the master cylinder
>but 
>> have not chased it. Just unplugged the wire so I do not have to see
>the 
>> red light all the time.
>> When I read that it might relate to the brake pedal mechanism on a
>later 
>> model, I wondered if it might be similar on the earlier model.
>> 
>> RB
>> 
>> On 18/01/2017 11:20 AM, MG via Mercedes wrote:
>>> Not familiar with those but if it is a sensor in the side of the 
>>> Master cylinder bore then it could be trying to tell you that one of
>
>>> your brake circuits isn't working. Probably the rear.
>>>
>>> Randy Bennell via Mercedes wrote:
>>>> Does anyone know if this would apply to a 115? My brake light will 
>>>> not go out either. I have got the light out by pulling the wire on 
>>>> the side of the master cylinder.
>>>>
>>>> RB
>>>>
>>>> On 16/01/2017 9:42 PM, MG via Mercedes wrote:
>>>>> I do believe that red light also lights up when the brake fluid is
>
>>>>> low. So you might want to check that or the sensor there.
>Sometimes 
>>>>> the parking brake doesn't come up all the way if it wasn't oiled
>for 
>>>>> a while. Might want to pull up on the peddle and see if that is
>it.
>>>>>
>>>>> Manfred
>>>>>
>>>>> clay via Mercedes wrote:
>>>>>> OOO  On that note.  Anybody able to point me toward the parking 
>>>>>> brake sensor?   While swapping in LCD cluster lights, I put in a 
>>>>>> working bulb where the parking brake indicator lived.  Now the 
>>>>>> light stays lit and will not go out even when the parking brake
>is 
>>>>>> off.  W126 SDL
>>>>>>
>>>>>> clay
>>>>>>
>>>>>>
>>>>>>
>>>>>>> On Jan 14, 2017, at 5:58 AM, Max Dillon via Mercedes 
>>>>>>> <mercedes@okiebenz.com> wrote:
>>>>>>>
>>>>>>> Don't forget the parking brake pads.  Rear rotor has a small
>drum 
>>>>>>> in center, parking brake assembly inside the drum.
>>>>>>> -- 
>>>>>>> Max Dillon 
>>>>
>>>>
>>>> ___ 
>> 
>> 
>> 

Re: [MBZ] Brake Light on (was Best Axle Choice)

[Max Dillon via Mercedes]

If I recall correctly, Randy has brought up this issue before.  His car's 
master cylinder has an extra sensor for the front-rear circuit's pressure 
differential, and that is the warning light.  
-- 
Max Dillon
Charleston SC
'87 300TD
'95 E300

On January 18, 2017 4:11:01 PM EST, MG via Mercedes  
wrote:
>It is probably connected to the parking brake warning switch, 
>(doesn't need much for the peddle to keep the switch closed. 1/4" 
>or so is enough) and in the 123s at least it also connects to the 
>reservoir level sensor. Pressing on the button on the top of the 
>reservoir will turn on the light. Sometimes the level float or 
>the button test contacts get stuck in the on position. Might 
>check that possibility if yours has that.
>
>Manfred
>
>Randy Bennell via Mercedes wrote:
>> I appear to have triggered it a few years back when I decided to put
>new 
>> brake fluid in and bled the brakes to clear the old fluid out.
>> I could not get the light to go out after and thought that maybe the 
>> trigger to it had become stuck in the master cylinder since opening
>the 
>> bleed screw and applying brake pressure woudl be similar to a failed 
>> line etc.
>> I subsequently ( a couple of years later) suffered a failure of the 
>> master cylinder and replaced it. Still cannot get the brake light to
>go 
>> out despite careful cleaning of the resevoir etc. Figure it is likely
>
>> something that has gone wrong with the switch on the master cylinder
>but 
>> have not chased it. Just unplugged the wire so I do not have to see
>the 
>> red light all the time.
>> When I read that it might relate to the brake pedal mechanism on a
>later 
>> model, I wondered if it might be similar on the earlier model.
>> 
>> RB
>> 
>> On 18/01/2017 11:20 AM, MG via Mercedes wrote:
>>> Not familiar with those but if it is a sensor in the side of the 
>>> Master cylinder bore then it could be trying to tell you that one of
>
>>> your brake circuits isn't working. Probably the rear.
>>>
>>> Randy Bennell via Mercedes wrote:
 Does anyone know if this would apply to a 115? My brake light will 
 not go out either. I have got the light out by pulling the wire on 
 the side of the master cylinder.

 RB

 On 16/01/2017 9:42 PM, MG via Mercedes wrote:
> I do believe that red light also lights up when the brake fluid is
>
> low. So you might want to check that or the sensor there.
>Sometimes 
> the parking brake doesn't come up all the way if it wasn't oiled
>for 
> a while. Might want to pull up on the peddle and see if that is
>it.
>
> Manfred
>
> clay via Mercedes wrote:
>> OOO  On that note.  Anybody able to point me toward the parking 
>> brake sensor?   While swapping in LCD cluster lights, I put in a 
>> working bulb where the parking brake indicator lived.  Now the 
>> light stays lit and will not go out even when the parking brake
>is 
>> off.  W126 SDL
>>
>> clay
>>
>>
>>
>>> On Jan 14, 2017, at 5:58 AM, Max Dillon via Mercedes 
>>>  wrote:
>>>
>>> Don't forget the parking brake pads.  Rear rotor has a small
>drum 
>>> in center, parking brake assembly inside the drum.
>>> -- 
>>> Max Dillon 


 ___ 
>> 
>> 
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>> 
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>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
>> 
>> 
>
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Re: [MBZ] Brake Light on (was Best Axle Choice)

[Randy Bennell via Mercedes]

As in, the main rod that comes through the booster into the master cylinder?

RB

On 18/01/2017 4:38 PM, Curley McLain via Mercedes wrote:

Or, the pushrod is not adjusted right.


MG via Mercedes 
January 18, 2017 at 11:20 AM
Not familiar with those but if it is a sensor in the side of the 
Master cylinder bore then it could be trying to tell you that one of 
your brake circuits isn't working. Probably the rear.









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Re: [MBZ] Brake Light on (was Best Axle Choice)

[Curley McLain via Mercedes]

Or, the pushrod is not adjusted right.


MG via Mercedes 
January 18, 2017 at 11:20 AM
Not familiar with those but if it is a sensor in the side of the 
Master cylinder bore then it could be trying to tell you that one of 
your brake circuits isn't working. Probably the rear.





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Re: [MBZ] Brake Light on (was Best Axle Choice)

[MG via Mercedes]

It is probably connected to the parking brake warning switch, 
(doesn't need much for the peddle to keep the switch closed. 1/4" 
or so is enough) and in the 123s at least it also connects to the 
reservoir level sensor. Pressing on the button on the top of the 
reservoir will turn on the light. Sometimes the level float or 
the button test contacts get stuck in the on position. Might 
check that possibility if yours has that.


Manfred

Randy Bennell via Mercedes wrote:
I appear to have triggered it a few years back when I decided to put new 
brake fluid in and bled the brakes to clear the old fluid out.
I could not get the light to go out after and thought that maybe the 
trigger to it had become stuck in the master cylinder since opening the 
bleed screw and applying brake pressure woudl be similar to a failed 
line etc.
I subsequently ( a couple of years later) suffered a failure of the 
master cylinder and replaced it. Still cannot get the brake light to go 
out despite careful cleaning of the resevoir etc. Figure it is likely 
something that has gone wrong with the switch on the master cylinder but 
have not chased it. Just unplugged the wire so I do not have to see the 
red light all the time.
When I read that it might relate to the brake pedal mechanism on a later 
model, I wondered if it might be similar on the earlier model.


RB

On 18/01/2017 11:20 AM, MG via Mercedes wrote:
Not familiar with those but if it is a sensor in the side of the 
Master cylinder bore then it could be trying to tell you that one of 
your brake circuits isn't working. Probably the rear.


Randy Bennell via Mercedes wrote:
Does anyone know if this would apply to a 115? My brake light will 
not go out either. I have got the light out by pulling the wire on 
the side of the master cylinder.


RB

On 16/01/2017 9:42 PM, MG via Mercedes wrote:
I do believe that red light also lights up when the brake fluid is 
low. So you might want to check that or the sensor there. Sometimes 
the parking brake doesn't come up all the way if it wasn't oiled for 
a while. Might want to pull up on the peddle and see if that is it.


Manfred

clay via Mercedes wrote:
OOO  On that note.  Anybody able to point me toward the parking 
brake sensor?   While swapping in LCD cluster lights, I put in a 
working bulb where the parking brake indicator lived.  Now the 
light stays lit and will not go out even when the parking brake is 
off.  W126 SDL


clay



On Jan 14, 2017, at 5:58 AM, Max Dillon via Mercedes 
 wrote:


Don't forget the parking brake pads.  Rear rotor has a small drum 
in center, parking brake assembly inside the drum.

--
Max Dillon 



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Re: [MBZ] Brake Light on (was Best Axle Choice)

[Randy Bennell via Mercedes]

On 18/01/2017 12:03 PM, Dan--- via Mercedes wrote:

You've got a stuck float switch in the brake fluid reservoir.

Those one or two little black rubber caps on top of the reservoir cover float 
switches that trigger the brake warning switch in the instrument cluster. If 
one gets hung up the light will remain on.

One way to tell for sure is to just unplug it and see if the light goes out.

D-


But how do I unstick the silly thing?

RB

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Re: [MBZ] Brake Light on (was Best Axle Choice)

[Dan--- via Mercedes]

You've got a stuck float switch in the brake fluid reservoir.

Those one or two little black rubber caps on top of the reservoir cover float 
switches that trigger the brake warning switch in the instrument cluster. If 
one gets hung up the light will remain on.

One way to tell for sure is to just unplug it and see if the light goes out.

D-

Sent from my iPad

> On Jan 18, 2017, at 12:34 PM, Randy Bennell via Mercedes 
>  wrote:
> 
> I appear to have triggered it a few years back when I decided to put new 
> brake fluid in and bled the brakes to clear the old fluid out.
> I could not get the light to go out after and thought that maybe the trigger 
> to it had become stuck in the master cylinder since opening the bleed screw 
> and applying brake pressure woudl be similar to a failed line etc.
> I subsequently ( a couple of years later) suffered a failure of the master 
> cylinder and replaced it. Still cannot get the brake light to go out despite 
> careful cleaning of the resevoir etc. Figure it is likely something that has 
> gone wrong with the switch on the master cylinder but have not chased it. 
> Just unplugged the wire so I do not have to see the red light all the time.
> When I read that it might relate to the brake pedal mechanism on a later 
> model, I wondered if it might be similar on the earlier model.
> 
> RB
> 
>> On 18/01/2017 11:20 AM, MG via Mercedes wrote:
>> Not familiar with those but if it is a sensor in the side of the Master 
>> cylinder bore then it could be trying to tell you that one of your brake 
>> circuits isn't working. Probably the rear.
>> 
>> Randy Bennell via Mercedes wrote:
>>> Does anyone know if this would apply to a 115? My brake light will not go 
>>> out either. I have got the light out by pulling the wire on the side of the 
>>> master cylinder.
>>> 
>>> RB
>>> 
 On 16/01/2017 9:42 PM, MG via Mercedes wrote:
 I do believe that red light also lights up when the brake fluid is low. So 
 you might want to check that or the sensor there. Sometimes the parking 
 brake doesn't come up all the way if it wasn't oiled for a while. Might 
 want to pull up on the peddle and see if that is it.
 
 Manfred
 
 clay via Mercedes wrote:
> OOO  On that note.  Anybody able to point me toward the parking brake 
> sensor?   While swapping in LCD cluster lights, I put in a working bulb 
> where the parking brake indicator lived.  Now the light stays lit and 
> will not go out even when the parking brake is off.  W126 SDL
> 
> clay
> 
> 
> 
>> On Jan 14, 2017, at 5:58 AM, Max Dillon via Mercedes 
>>  wrote:
>> 
>> Don't forget the parking brake pads.  Rear rotor has a small drum in 
>> center, parking brake assembly inside the drum.
>> -- 
>> Max Dillon 
>>> 
>>> 
>>> ___ 
> 
> 
> ___
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> 
> To search list archives http://www.okiebenz.com/archive/
> 
> To Unsubscribe or change delivery options go to:
> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
> 
> 


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Re: [MBZ] Brake Light on (was Best Axle Choice)

[Randy Bennell via Mercedes]

I appear to have triggered it a few years back when I decided to put new 
brake fluid in and bled the brakes to clear the old fluid out.
I could not get the light to go out after and thought that maybe the 
trigger to it had become stuck in the master cylinder since opening the 
bleed screw and applying brake pressure woudl be similar to a failed 
line etc.
I subsequently ( a couple of years later) suffered a failure of the 
master cylinder and replaced it. Still cannot get the brake light to go 
out despite careful cleaning of the resevoir etc. Figure it is likely 
something that has gone wrong with the switch on the master cylinder but 
have not chased it. Just unplugged the wire so I do not have to see the 
red light all the time.
When I read that it might relate to the brake pedal mechanism on a later 
model, I wondered if it might be similar on the earlier model.


RB

On 18/01/2017 11:20 AM, MG via Mercedes wrote:
Not familiar with those but if it is a sensor in the side of the 
Master cylinder bore then it could be trying to tell you that one of 
your brake circuits isn't working. Probably the rear.


Randy Bennell via Mercedes wrote:
Does anyone know if this would apply to a 115? My brake light will 
not go out either. I have got the light out by pulling the wire on 
the side of the master cylinder.


RB

On 16/01/2017 9:42 PM, MG via Mercedes wrote:
I do believe that red light also lights up when the brake fluid is 
low. So you might want to check that or the sensor there. Sometimes 
the parking brake doesn't come up all the way if it wasn't oiled for 
a while. Might want to pull up on the peddle and see if that is it.


Manfred

clay via Mercedes wrote:
OOO  On that note.  Anybody able to point me toward the parking 
brake sensor?   While swapping in LCD cluster lights, I put in a 
working bulb where the parking brake indicator lived.  Now the 
light stays lit and will not go out even when the parking brake is 
off.  W126 SDL


clay



On Jan 14, 2017, at 5:58 AM, Max Dillon via Mercedes 
 wrote:


Don't forget the parking brake pads.  Rear rotor has a small drum 
in center, parking brake assembly inside the drum.

--
Max Dillon 



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Re: [MBZ] Brake Light on (was Best Axle Choice)

[MG via Mercedes]

Not familiar with those but if it is a sensor in the side of the 
Master cylinder bore then it could be trying to tell you that one 
of your brake circuits isn't working. Probably the rear.


Randy Bennell via Mercedes wrote:
Does anyone know if this would apply to a 115? My brake light will not 
go out either. I have got the light out by pulling the wire on the side 
of the master cylinder.


RB

On 16/01/2017 9:42 PM, MG via Mercedes wrote:
I do believe that red light also lights up when the brake fluid is 
low. So you might want to check that or the sensor there. Sometimes 
the parking brake doesn't come up all the way if it wasn't oiled for a 
while. Might want to pull up on the peddle and see if that is it.


Manfred

clay via Mercedes wrote:
OOO  On that note.  Anybody able to point me toward the parking brake 
sensor?   While swapping in LCD cluster lights, I put in a working 
bulb where the parking brake indicator lived.  Now the light stays 
lit and will not go out even when the parking brake is off.  W126 SDL


clay



On Jan 14, 2017, at 5:58 AM, Max Dillon via Mercedes 
 wrote:


Don't forget the parking brake pads.  Rear rotor has a small drum in 
center, parking brake assembly inside the drum.

--
Max Dillon 



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Re: [MBZ] Brake Light on (was Best Axle Choice)

[Curt Raymond via Mercedes]

Bad sensor?
-Curt

  From: Randy Bennell via Mercedes <mercedes@okiebenz.com>
 To: Mercedes Discussion List <mercedes@okiebenz.com> 
Cc: Randy Bennell <rbenn...@bennell.ca>
 Sent: Wednesday, January 18, 2017 11:36 AM
 Subject: Re: [MBZ] Brake Light on (was Best Axle Choice)
   
Does anyone know if this would apply to a 115? My brake light will not 
go out either. I have got the light out by pulling the wire on the side 
of the master cylinder.

RB

On 16/01/2017 9:42 PM, MG via Mercedes wrote:
> I do believe that red light also lights up when the brake fluid is 
> low. So you might want to check that or the sensor there. Sometimes 
> the parking brake doesn't come up all the way if it wasn't oiled for a 
> while. Might want to pull up on the peddle and see if that is it.
>
> Manfred
>
> clay via Mercedes wrote:
>> OOO  On that note.  Anybody able to point me toward the parking brake 
>> sensor?  While swapping in LCD cluster lights, I put in a working 
>> bulb where the parking brake indicator lived.  Now the light stays 
>> lit and will not go out even when the parking brake is off.  W126 SDL
>>
>> clay
>>
>>
>>
>>> On Jan 14, 2017, at 5:58 AM, Max Dillon via Mercedes 
>>> <mercedes@okiebenz.com> wrote:
>>>
>>> Don't forget the parking brake pads.  Rear rotor has a small drum in 
>>> center, parking brake assembly inside the drum.
>>> -- 
>>> Max Dillon 


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Re: [MBZ] Brake Light on (was Best Axle Choice)

[Randy Bennell via Mercedes]

Does anyone know if this would apply to a 115? My brake light will not 
go out either. I have got the light out by pulling the wire on the side 
of the master cylinder.


RB

On 16/01/2017 9:42 PM, MG via Mercedes wrote:
I do believe that red light also lights up when the brake fluid is 
low. So you might want to check that or the sensor there. Sometimes 
the parking brake doesn't come up all the way if it wasn't oiled for a 
while. Might want to pull up on the peddle and see if that is it.


Manfred

clay via Mercedes wrote:
OOO  On that note.  Anybody able to point me toward the parking brake 
sensor?   While swapping in LCD cluster lights, I put in a working 
bulb where the parking brake indicator lived.  Now the light stays 
lit and will not go out even when the parking brake is off.  W126 SDL


clay



On Jan 14, 2017, at 5:58 AM, Max Dillon via Mercedes 
 wrote:


Don't forget the parking brake pads.  Rear rotor has a small drum in 
center, parking brake assembly inside the drum.

--
Max Dillon 



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