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Proportioning valve

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Guest
Anonymous Poster
willyb236@verizon.net

Sep 23, 2006, 9:49 AM

Post #1 of 4 (3848 views)
Proportioning valve Sign In
I posted about a week ago, about an 89 acclaim that has been sitting for 9 months. I have no brake pedal after starting the engine. I have replaced two lines that were leaking at the left front wheel and bled the entire system. When bleeding the brakes, the fluid level in the front resevoir of the master cylinder drops whether I am bleeding the front or the rear brakes. I was told that I need a new proportioning valve. Is this the problem, or is there another valve in the system?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 23, 2006, 2:17 PM

Post #2 of 4 (3846 views)
Re: Proportioning valve Sign In
In decades I've never seen a bad proportioning valve or if it has a wire called a combination valve which makes your brake light come on.

If the system bled out and you still have a low pedal I think the master cylinder is probably at fault. Sitting for nine months isn't great for a car but it's not all that long.

I would think if that part was bad you wouldn't be able to bleed either of front or rear system -- some are cris crossed but even if stuck you would get a firm pedal.

Sometimes what happens is the master cylinder gets some crust in the path of travel it never went to and in just bleeding the system the seals get torn.

My vote is the master cylinder is the problem, T



Guest
Anonymous Poster
willyb236@verizon.net

Sep 23, 2006, 3:23 PM

Post #3 of 4 (3844 views)
Re: Proportioning valve Sign In
That was my first assumption, but is it possible for the master cylinder to feed both the rear and front brakes from the front resevoir?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 24, 2006, 7:24 AM

Post #4 of 4 (3840 views)
Re: Proportioning valve Sign In
Many master cylinders will "share" fluid but only to a point. That does not explain your situation but it is the common denomitor for the problem, T






 
 
 






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