I have a 71 chevelle that i have switched over to disc brakes. The problem is that the power booster that i have will not match up with the master cylinder that i have for the disc brakes. the master cylinder is the right one, but i don't know if i have the right booster, how can you tell? the problem is when you hook up the booster and the master cylinder to the pedal the pedal will not move
foward like there is to much lenthg in the plunger, so i tried settingit up manually but the old plunger for manual brakes is too long also. if anyone can reply to help me out i would appreciate it. thanks

Mike
I'm not sure I understand your problem completely but I can offer this.

The push rod that connects your pedal to the booster might be connected wrong. On a drum brake car the rod is connected to the upper hole on the pedal, on a disk car it is connected to the lower hole. Also the original rod is adjustable and you might be able to reuse it. (it depends on which power booster you are using, several different ones will work) Generally you must replace the push rod with a slightly longer one.

If I'm way off base, tell us more.

Clark

It seem likes the the connecting rod is too long to begin with when i set the booster uo on the fire wall and put the master cynlinder on, and connect every thing to the pedal, the pedal is stuck in the middle. It will not come back to the rubber stopper or it will not move forward because ti feels like the brakes are already engaged, becausse when you put the cylinder on the booster the rod does not move back but the cylinder is engaged at that time, maybe something is froze up inside , i don't know

Mike

I hate to say it but it looks like you should pull it all apart again and make sure nothing is binding. the master cylinder and booster should move freely and after pushing booster input rod all the way in it should return to the fully extended position. Also while your at it, make sure your pedal isn't caught on something. By the way where did you get the brakes?

Good Luck

Clark

Ps. It takes a fair bit more effort to press the pedal with power brakes than non power. once the engine is running and a good vacumn going then the pedal effort will become very light.