Sorry for the basic question, but I'm still learning what all was done too this car since I bought her earlier this month. I asked my dad what cam he had put in the motor when it was yanked and rebuilt lastyear. He said it had a Crane 282-H08 Energizer 3/4 Race (lol why they STILL use the ol skool moniker?) installed in it. The master cylinder was also replaced with a new/reman unit, but it takes quite a bit of "leg pushin" to stop things and keep them stopped at idle. I don't consider that cam anywhere near big enough to cause vacuum problems, but would it be big enough to create the brake problem I mentioned?

My dad said the brakes never were too his liking but the guy who has done all the work said everything checks out and is ok. (The car runs and stops fine, just takes considerably more force on the pedal than compared too most power brake cars.)

Curious,
RA

How much vacuum do you have?
Check this thread out http://www.chevelles.com/forums/showthread.php?t=252076&highlight=low+vacuum

I dont know how much vac I got, will hafta check I reckon. Troposcuba described it though, low pressure makes pedal HARD AS A ROCK. Right now it's hard enough I wouldn't want my wife driving it.

Saaaaaaaaay is that ALL bad? I might just hafta leave it as is, "Honey from a purely safety aspect, you cannot drive this car!" :yes: :hurray: :D

THANKS GUYS, :thumbsup:
RA

it is possible that a camshaft may cause an engine to NOT produce enough vacuum (negative pressure) at idle or low rpm. I used to run an extra vacuum canister to store vacuum for a few extras stops and/or more power assist. basically, the canister just gives you an extra reserve of assist.

also, make sure the check valve on the booster is working properly. as funny as it sounds, you can use your mouth for this one. it should prevent vacuum from returning to the intake.

15 inches of Mg is enough to operate the power boster. If you have less then that you either need hydrobost or a vaccum pump