LS6 Intake - Brake Booster Vacuum
Maybe the way I'm wording this is incorrect. I can tell you that if your master cylinder is removed from the booster and you inadvertently press in the brake pedal your going to hear a loud pop and the rod that depresses into the piston on the master cylinder is going to shoot out of the brake booster. Didn't think nothing of it when I saw the rod laying in the engine bay but after swapping the engine over and bleeding the brake system I noticed that my car had a really hard brake pedal and did not want to stop the car very well. Had plenty of vacuum from the intake manifold to function the booster and when I hooked the Mighty-Vac to the booster it would not hold a vacuum. I went home and checked the booster on my other car and it did hold a vacuum. Someone told me I had ruptured the diaphragm in the booster so that's why I used that term. I did not hear any hissing either when driving the car which is what you normally would expect to hear with a bad booster.
Had to 
brake booster diaphragm and this is what I came up with.
What is a brake diaphragm?
The diaphragm creates two chambers inside the brake booster, separating an environment with air pressure from another under vacuum. As the pedal is pressed, the diaphragm moves, and more air at atmospheric pressure is added, increasing the braking force.
What is the difference between a single and dual diaphragm brake booster?
Single vs Dual Diaphragm Brake Booster. SINGLE DIAPHRAGM BOOSTERS work well with four wheel drum systems or front disc brakes and rear drum applications. DUAL DIAPHRAGM BOOSTERS are needed for four wheel disc systems because they can produce a higher level of brake assist even if their physical size is smaller
In an effort to clear up any confusion with regards to the check valve I did remove those posts but if that valve is not working correctly then OP will not be able to pull vacuum on the booster. I agree with you Scott and feel the issue is either the master cylinder or the brake booster itself.
brake booster diaphragm and this is what I came up with.What is a brake diaphragm?
The diaphragm creates two chambers inside the brake booster, separating an environment with air pressure from another under vacuum. As the pedal is pressed, the diaphragm moves, and more air at atmospheric pressure is added, increasing the braking force.
What is the difference between a single and dual diaphragm brake booster?
Single vs Dual Diaphragm Brake Booster. SINGLE DIAPHRAGM BOOSTERS work well with four wheel drum systems or front disc brakes and rear drum applications. DUAL DIAPHRAGM BOOSTERS are needed for four wheel disc systems because they can produce a higher level of brake assist even if their physical size is smaller
In an effort to clear up any confusion with regards to the check valve I did remove those posts but if that valve is not working correctly then OP will not be able to pull vacuum on the booster. I agree with you Scott and feel the issue is either the master cylinder or the brake booster itself.
Last edited by 01CamaroSSTx; May 29, 2021 at 09:20 AM.
