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Why would the brake pedal go to the floor after the brake booster brakes and the brakes have bled still go to the floor?
Wiki User
∙ 13y ago
There is still air in the system. On some GM vehicles the master cylinder sits at an angle. It has to be level to bleed. Jack up the back end. To bleed the brakes, start with the back passenger wheel and work forward. Get a piece of hose that will just fit over the bleeder screw. With the screw open, put one end over the screw and the other end in a container with an inch of brake fluid in it so that the end is covered. Now slowly pump the brake until most of the fluid in the master cylinder is gone. Stop before it is empty. Close the screw and move to the drivers side and repeat. Front passengers then drivers. One fill of the master cylinder for each wheel should be enough to bleed any air. By using the hose method, it is impossible to get air back into the system.-
IF the booster has lost vaccum, and is no longer working because of the loss of vaccum. Or in the more modern models, electricity is not getting to the brake booster. Check your wiring and fuses. (Powered brakes work off of two sources, vaccum or electricity.) Or a bad booster. In a non "powered brake" vehicle (which there are NOT that many on the road...most are collectors cars...) it could be the "Master cylinder" has a bad seal or cracked piston.
Wiki User
∙ 13y ago
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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.
What does a brake booster do?
a brake booster supplies power to the brake system. this takes the hard out of the brake pedal allowing brakes to work harder with less effort or pressure on pedal from the driver
What would cause the brake pedal to be hard and not go to the floor and doesnt engage brakes?
Your power brake booster may be defective. You may have a vacuum leak or the booster itself could need replacing.
What would cause a hissing noise to come from the brake pedal on a 1990 ranger when it is pressed down to the floor and the brakes barely work?
Vacuum brake booster is defective or the hose going to the booster is leaking.
Having brake problems on a 95 ford ranger xlt 2.3l v6 you replaced master cylinder brake booster bled the brakes pedal still goes to the floor?
You need to bleed the brakes.
What are symptoms of a bad power brake booster?
hard brake pedal is the most obvious sign only way i know to test a booster, is to turn engine off. use brakes several times till pedal is hard. then with brake applied,start engine. the brake pedal should then soften.if the pedal stays hard the booster is bad
Why does it sound like air is seeping out when I press my brake pedal on my 1997 Chevy Tahoe.?
The power brakes on most vehicles operate on the engine vacuum. If there is a leak or problems with the power brakes it can make a hissing sound. But then, sometimes power brakes do that when they're working properly. It could be from either a hole in the diaphragm of the brake booster or normal operation. If the sound is new, and was not there before, and your brake pedal is going to the floor, then you should have the power booster replaced.
What are the symptoms of a defective master cylinder?
usually they will leak out the back by the booster, your brake pedal will slowly go to the floor at stops or the brake pedal will go right to the floor when pushed.
The brake pedal goes to the floor and they act as if they're pulsating?
Sounds like a bad booster. If you can't pump up the brakes to get a firm pedal while engine on, you might want to have it checked. If they're ABS brakes and you hold the pedal firmly, it should feel like they're pulsating but the pedal shouldn't just go to the floor. Could be the master cylinder.
Why would Brake pedal on ford zx2 stay up with car off but go to floor when car is turned on?
Vacuum booster is working--When vehicle off there is no vacuum assist (for power brakes) When vehicle is on vacuum is present Brake pedal going to floor is another problem--no fluid in master cylinder? Leak in system? Brakes not adjusted properly?
What could be wrong when the brake pedal gets really hard when aplying brakes?
Power booster is bad or the vacuum supply to booster is cut off.
Why does it sound like air is coming out of your brakes?
brake booster could be bad the seal around the rod that hooks to the brake pedal is leaking
