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Brake issues
December 13, 2014 - 9:53 pm

My cousin drives a Chev impala with a 305 motor, P.S., P.B. I had the right front hose break and after I changed it , I bled the master cyl and then the brakes, starting at the right rear. couldn't get much fluid at the rears. I think it may be the booster, any thoughts?

December 15, 2014 - 3:29 pm

The brake booster is designed to create a greater braking force from minimum pedal effort, using a difference in atmospheric pressure and the engine's manifold vacuum. It increases the pedal force 2 to 4 times depending on the size of the diaphragm. The brake booster is located between the brake pedal and the master cylinder.

When pressure is applied to the brake pedal, pressure is exerted on the booster air valve. With pressure created by the booster the master cylinder is applied. Should the booster malfunction, the normal mechanical force of the master cylinder is maintained.

This being said I feel that it very well could be the booster.

December 17, 2014 - 12:27 pm

Right. A brake booster needs the right amount of vacuum to operate correctly. This is typically engine manifold vacuum (17-21Hg) and on some engines, particularly diesels, an auxiliary pump is used to create vacuum. This vacuum is applied to both sides of the booster. Both the pedal side and the master cylinder side.

December 17, 2014 - 6:41 pm

However, my bet would be on Master cylinder. Sometimes they will leak very slowly out the back, and not be able to effectively seal. Brake boosters rarely go bad.

Go over every inch of your lines. If your fluid is going down, find where it is going.

Sane Watson
July 5, 2016 - 9:33 am

Issues with brake are extremely dangerous, so I always get it check once in a month, at least. I believe it’s not just about our own safety, but it’s for people around us and most importantly, it’s for our family!

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