nick0187

So I just picked up a 1975 vette, and the brakes on it are almost non existent. The previous owner said that they were working decent and he heard a loud pop and then they went almost dead. When I press the brake pedal, there is a loud air leaking sound and I have to mash my foot down as hard as I can to get any braking at all. Im just a backyard mechanic, Im assuming its the brake booster that bit the dust, any other ideas? Should I get a new master cylinder as well? just want it safe to drive.

cagotzmann

you can test the booster with a hand vacuum pump. Not worth replacing the master cylinder and this point.

This is how I tested my booster. You can do the same test on the car.

https://www.corvetteforum.com/forums...f-the-car.html

7T1vette

Failed seal in the brake booster is the most likely cause of your problem. As mentioned, you can test it with a hand vacuum pump; and I suggest that you do so before going to all the trouble of a swap-out.