vettist 10 Report post Posted November 18, 2010 i have problems that my rear breakes locks up in hard braking and the front seems to have very little effect, the car has now power discs but came with power drums.the pedal only need a feathers touch to react and the brake light only works on much higher pedal force.anyone been there?:helpsmilie: Quote Share this post Link to post Share on other sites
StephenC 10 Report post Posted November 18, 2010 Sounds like it could be something with the proportioning valve? Try adjusting it and/or replacing it. Thats were I would start at least. Proportioning valve is on the driver side inside fender right next to the master cylinder. Also does it have a brake booster? Quote Share this post Link to post Share on other sites
vettist 10 Report post Posted November 19, 2010 Sounds like it could be something with the proportioning valve? Try adjusting it and/or replacing it. Thats were I would start at least. Proportioning valve is on the driver side inside fender right next to the master cylinder. Also does it have a brake booster? how do i adjust the valve and yes i do have a booster Quote Share this post Link to post Share on other sites
mikem 13 Report post Posted November 21, 2010 If you have a stock distribution block with proportioning valve, then there is no adjustment. If you have an aftermarket one, then its simply a matter of twisting the knob until you get even braking. Quote Share this post Link to post Share on other sites
StephenC 10 Report post Posted November 21, 2010 If you have a stock distribution block with proportioning valve, then there is no adjustment. If you have an aftermarket one, then its simply a matter of twisting the knob until you get even braking. +1 on that. I put an SSBC proportioning valve on when I did my brakes. Quote Share this post Link to post Share on other sites
vettist 10 Report post Posted November 23, 2010 the p-valve is stock,maybe i need bigger dia rear cylinders.or the booster is wrong its a bendix type .whats the difference between a drum vs disc booster? Quote Share this post Link to post Share on other sites
buening 63 Report post Posted November 23, 2010 What master cylinder are you using? Quote Share this post Link to post Share on other sites
vettist 10 Report post Posted November 24, 2010 i swapped the discs,spindels,booster,etc from a 70 sr and that car got my drums etc.the m/c is a 1 inch bore . Quote Share this post Link to post Share on other sites
buening 63 Report post Posted November 24, 2010 Is it a m/c made for disc/drum? Just making sure you don't have the old drum/drum master cylinder in there. Quote Share this post Link to post Share on other sites
vettist 10 Report post Posted November 25, 2010 the m/c was bought for a disc car Quote Share this post Link to post Share on other sites
MikeStang 247 Report post Posted November 26, 2010 Maybe the valve needs to be centered? I have read that some times you get the compalint your describing when the valve needs to be centered? have some one pump the brakes, then crack a line at the master Cyl, i think that is the description of how to center it....Some one else chime in plz :LOL Quote Share this post Link to post Share on other sites
