JacobK

iTrader: (10)

Im having some problems guys, i thought my master cylinder was out on my car, cause when i go to brakes hard, the pedal would get hard and it wouldnt stop, so i had the master cylinder changed and its still doing it..Now im thinking maybe im not pulling enough vaccuum and thats why its causing it to do that...what do you guys think?

oange ss

iTrader: (50)

check MAP sensor,brake booster line and manifold for leaks

JacobK

iTrader: (10)

i was thinking of putting a vaccuum canister on the car..do you guys think that would be something to try?

DaddySS

Start by checking the vacuum at the booster, and check the booster for leaks. Did it start doing it immediately after your cam swap?

JacobK

iTrader: (10)

it does seem like after my swap it started doing it..

muncie21

iTrader: (14)

Put a gauge on it. Stock cars should run 15-18" at idle. As the cams get bigger it gets worse from there.

oange ss

iTrader: (50)

i suspect that cam isnt very big from your dyno numbers, so there is no reason you shouldnt have enugh vacuum for brakes, ect...check for a vacuum leak or possible leaking booster

JacobK

iTrader: (10)

my cam is a 233/239 .595/.605 on a 112..i do have 126K miles if that makes a difference..

oange ss

iTrader: (50)

mileage maybe a factor, but you would be hard pressed to put those numbers down if the motor was hurt

JacobK

iTrader: (10)

thats what i mean..soo i dont know..im gonna borrow a buddies vaccuum guage this weekend and see what happens..