Brake booster ?'s

[lutronjim]

My 70 C10 with LS gen 3 has disk front / drums rear with, I'm guessing, an 11" booster. If I have to do a quick stop, the brakes hang at around 20%. I can stop remove the vac hose and everything returns to normal. Replace vac hose and good to go.

The rear hose has been replaced. The petal has about 3/8 inches of play.

I am guessing that the rear chamber seal gets wedged or something letting atmospheric pressure leak in. The booster also will not hold - if I have foot on brake and cut engine the petal comes up.

Since the booster is leaking it needs to be replaced which I hope will solve the hang up problem.

I also would like more assist. I was looking to buy one of Captainfabs mounts and get a dual 9" booster like from an S15.

The stock mount looks to loose about 1/2 of the petal force and gain 2 times the travel because of the linkage. I assume its purpose is to move the booster so it wouldn't hit the shift arms.

My questions: Since I would gain quite an advantage with the direct mount, would the dual booster be too much? Would the extra distance needed with the new mount cause the petal to go to low?

Any help would be greatly appreciated.