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
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