Re: Brake problems

Sat, 17 Dec 2005 04:08:48 -0800

Title: Message
where is the resiuual valve located? do all cars with drums have them? 
----- Original Message -----
Sent: Saturday, December 17, 2005 10:52 PM
Subject: Re: Brake problems

the master is fully depressed, ie i can move the pedal a couple of mm
before it takes pressure, how do i overcome this?
 
If the travel is not sufficient for the piston to open the transfer port of the cylinder you will not get a pressure drop in the line so thew pedal is hard from the strat of application.
this sounds right?,
i had slightly more pressure on the fronts than the rears.
 
i was braking quite hard earlier when it did it, looks like the pressure is slowly realised over the day, can heat somehow have anything to do with this?
 
looks like i need a ignition module as well, not firing on no.4 (bugger)
 
 
thanks Errol
Heath
----- Original Message -----
Sent: Saturday, December 17, 2005 9:19 PM
Subject: RE: Brake problems

Heath,
The check valve is fitted to the master cylinder to keep a 2-3 psi residual pressure in the rear drum brake line so the shoes do retract fully after operation.
With a disc brake this means the pads may not fully release,
Another item to check is thaaat the pedal is allowing the piston to fully open the bypass port so residual pressure is being released from all line.
If the travel is not sufficient for the piston to open the transfer port of the cylinder you will not get a pressure drop in the line so thew pedal is hard from the strat of application.
Cheers
Feral Errol
www.datrats.com.au
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of The Cleary's
Sent: Saturday, December 17, 2005 4:12 PM
To: [email protected]
Subject: Re: Brake problems

?? Errol what is the check valve?
i have driven the car approx a total of 30 k's (not 30,000)
over a period of a year, it seemed a little better when the car cooled
 
thanks
Heath
----- Original Message -----
Sent: Saturday, December 17, 2005 1:13 PM
Subject: RE: Brake problems

The master probably still has the check valve fitted to the rear lines..
 
 
 
Cheers
Feral Errol
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of The Cleary's
Sent: Saturday, December 17, 2005 11:46 AM
To: [email protected]
Subject: Brake problems

Hi Guys
my datto brake master is playing up, the pedal is hard straight away
the pedal  used to move down about an inch then be hard, now it's hard straight away
and all the brakes have some pressure on them, it is a sunny master(i think 13/16) it was brand new but is probably 2yrs old. i have no booster
twin sumi front, R31 rear
Heath

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