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A vacuum leak in the vacuum assist for the brakes. It is the big round thing that is behind the brake mastercylinder. Check the vacuum connections to this.

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Q: What would make a busted air noise while holding the brake pedal to the floor in a 1994 gmc sierra 1500 pick up truck?
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What is the term for blocking a bill for holding the floor?

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Can the brake booster cause your brake pedal to go to the floor?

No, a busted brake booster will not cause the brake pedal to go to the floor. It will however cause the brake pedal to be extremely hard to push. A defective master cylinder will cause what you describe. Replace the master cylinder and bleed the brakes. It can because it happened to me. The booster lost vaccum and the pedal went to the floor. Sorry, you are wrong. The only reason the pedal went to the floor was because the master cylinder failed. The brake booster only boosts the pressure on the master cylinder and allows you to not have to push so hard on the brake pedal. Cars of yesteryear did not even have a brake booster and they stopped just fine albeit you had to push the pedal allot harder than with power brakes. A failing brake booster will not cause your pedal to go to the floor although it might cause it to go lower than normal before the brakes apply. As long as the master cylinder is good you will still have brakes, but you will have to really push hard and might even have to pump them up in order for them to stop the car.


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