Thread: Proportioning valve question.

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Here's a look at the master....no magic here. The front half of
the cylinder juices the rear brakes, and the rear part does the
front binders. Is this correct ?

Somewhere in what's left of my brain....I think the "double
master cylinder" already has a built in proportioning system....
which should send more power to the front brakes. This by the
way, is supposed to be a Corvette m/cyl.

For what it's worth....the pedal will stick down, whether the brake
is applied going frontwards, or backwards.

I will, of course, put some type of a return spring on it should the
need arise....but there is something rotten in Denmark.

Daver.

Originally posted by Daver
Here's a look at the master....no magic here. The front half of
the cylinder juices the rear brakes, and the rear part does the
front binders. Is this correct ?

Somewhere in what's left of my brain....I think the "double
master cylinder" already has a built in proportioning system....
which should send more power to the front brakes. This by the
way, is supposed to be a Corvette m/cyl.

For what it's worth....the pedal will stick down, whether the brake
is applied going frontwards, or backwards.

I will, of course, put some type of a return spring on it should the
need arise....but there is something rotten in Denmark.

Daver.

try the vac. deal and let me know

I'll put my 2 cents in, to me it sounds like a vacuum problem.
about the residual valve, the blue valve is 2lbs and the red are 10 lbs. in saying that, if your running disc's front and drums rear you would want 2 lbs running to the front and 10 lbs to the rear.
your running disc's on all fours, some companies say run 2 lbs front and rear for four wheel disc's.

I yanked the vacuum line off the carb to the booster....

....no joy.

Out of desperation, I called TCI tech support. The nice man
said I "must fit a return spring to the brake pedal".That was
special....however they do not offer a spring. Not a problem,
a trip to the hardware store....netted a nice spring.

He said I needed two red brake valves (the 10 pounders) for
the drums brakes....fore and aft.

He also informed me that.....on the proportioning valve....

....all the way in....is all the way open.

Daver.

Originally posted by Daver
I yanked the vacuum line off the carb to the booster....

....no joy.

Out of desperation, I called TCI tech support. The nice man
said I "must fit a return spring to the brake pedal".That was
special....however they do not offer a spring. Not a problem,
a trip to the hardware store....netted a nice spring.

He said I needed two red brake valves (the 10 pounders) for
the drums brakes....fore and aft.

He also informed me that.....on the proportioning valve....

....all the way in....is all the way open.

Daver.

you're telling me the tci man said fore your brakes to work properley you have to rig up a way to put a return spring on the padel, but they didnt provide a way from the factory. just think about that for a mim. they are saleing these brakes to ea. and every one and the people are suppose to know that they are suppose to fab. a spring to it. this would be a safety problem so i thnk it should rase red flags all over the place. i usad wilwod a few times with no spring. the weight of the brake padel is not going to lockup your brakes. you might need it for a anti-raddle spring but not to keep your brakes from locking up.

I rigged up a brake pedal return spring, and it's working properly
now. I still don't know what the little valves do, but I need to
get another red one, and take off the blue one (the front).

I cranked the proportioning valve all the way in. I have some
other "brake issues" as well, but I'm working on it.

Daver.

Originally posted by Daver
I rigged up a brake pedal return spring, and it's working properly
now. I still don't know what the little valves do, but I need to
get another red one, and take off the blue one (the front).

I cranked the proportioning valve all the way in. I have some
other "brake issues" as well, but I'm working on it.

Daver.

daver i dont know how i can make you understand about these brakes, but if you have had to rig a spring to your pedal so your brakes will release, then thats what youve got, some rigged up brakes. you still have a brake problem. the rod
(that goes to the padal) is part of the booster, it not suppose to pull out out of the booster and the booster pushes it back (untill it bottoms out) when you let off of the padal. if the booster is not pushing the rod out all of the way, then you have a booster problem. the spring in the booster is going to be a lot stiffer than any spring you bought at the parts store. you can put a spring on it if you wont to, it wont heart anything, but if you are doing it to release your brakes,you are doing it for the wrong reason. youve got another problem. you still might need it use the porportioning valve to adj. front to rear brake balance before you get them like you wont them. the brake padel is tied to the booster by the brake rod. where ever the brake booster goes so goes the padel.