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Aug 23, 2012 | 09:40 PM

silver79

Thread Starter

Racer

Joined: Jul 2001

Posts: 483

Likes: 3

From: d.d.o quebec

Spin Doctors

I have a 268EX comp cam in my 1979 corvette L-82 automatic. My brakes a very week, the pedal get very hard , when press. I had the vacuum system checked and they are telling me I am pulling about 10 " of vacuum the cam can be the cause, it isn't producing enough vacuum..... This cam has been in my Vette for at least 7 years, what do you guys think the problem is?

Thanks

Aug 23, 2012 | 11:37 PM

Shark Racer

Race Director

Joined: Jan 2000

Posts: 12,399

Likes: 247

From: San Jose CA

If it just started happening... the booster is going south. I'm assuming it didn't start happening 7 years ago.

Make sure, of course, that there aren't any other vacuum leaks in the system that could be disrupting the booster.

Aug 24, 2012 | 12:03 AM

George Ries

Instructor

Joined: Mar 2012

Posts: 184

Likes: 0

From: Lancaster Pa

cam

i have run the same cam in my 76 and went to the next one bigger and my power brakes have had no problems its your booster

Aug 24, 2012 | 08:03 AM

silver79

Thread Starter

Racer

Joined: Jul 2001

Posts: 483

Likes: 3

From: d.d.o quebec

No it was fine 7 years ago, I will Chang the booster

Aug 24, 2012 | 10:25 AM

1yy07

Racer

Joined: Dec 2000

Posts: 336

Likes: 0

From: Nashville Tn. U.S.A. Tn.

booster repaier

send your booster to booster dewey 503-238-8882. time and $ well spent

Aug 24, 2012 | 01:49 PM

silver79

Thread Starter

Racer

Joined: Jul 2001

Posts: 483

Likes: 3

From: d.d.o quebec

The vucumm reading at the carb is between 5 and 10" my mecanic says that the engine is not producing enough vacuum....

I that vacuum normal?

Aug 24, 2012 | 03:13 PM

scottyp99

Le Mans Master

Joined: Mar 2008

Posts: 5,948

Likes: 72

From: Oxford MA-----You just lost the game!!!!

Quote:

Originally Posted by silver79

The vucumm reading at the carb is between 5 and 10" my mecanic says that the engine is not producing enough vacuum....

I that vacuum normal?

If the brake booster has a leak, she bleeds off the vacuum, like a vacuum leak. Fix the leak, and the engine, she will produce more vacuum! C'est bon!!!

Keep the shiny side up!