Brake problem

[are_one]

I did a search and no one else has had the same problem Im having. I didn't realize it till I had to slam on the brakes and the car gradually slowed and pedal just got hard. The car has had the vacuum conversion done to it. I went ahead and added a vacuum resevoir and I still have the problem. At slow speeds it seems to do OK, but if I have to jam the brakes, the pedal just gets hard. Any ideas?

 

[TurboBuickSix]

If you are not running a stock cam that could be the problem.

 

[Hawaiian Turbo]

How's the check valve on the booster?

 

[Glen]

In a nutshell, low vacuum . If the check valve is proper for the system, and they do make a difference, I would suspect the booster. The problem also shows up on the Monte Carlo's with the Dual Diaghram booster. Why don't know. Have seen sucksses by installing a factory valve as oppossed to a parts store part, but sometimes have had to change out the booster. I am not famaliar with the conversion, does it have an electric vacuum pump? They are availible from many source's, and is another option.

 

[dadmomcat]

part numbers

What part numbers for booster and check valve and master cylinder for a vacuum conversion should i ask for at Pep boys or ???

Thanks

 

[Roger]

Got tired of the vacuum conversion problems.

Advance Auto Parts lifetime warranty PM was $199 & I have read later posts as low as $150. Other parts houses have similar warranties & prices.