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Did you bench bleed the master cylinder? If not you may have to continue the bleeding process Try opening the RR bleeder screw-let fluid gravity feed into a container filled with fluid and depress brake pedal about 3/4 of the way probably 3-4 times closing bleeder between pumps and continue with other wheels LR-RF-LF

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Q: 94 thunderbird ive put a master cylinderbrake booster on it bled brakes still have only half pedel with lots of air?
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Is it possible to convert abs to standard hydraulic brakes on a 1990 Jeep Laredo?

Yes, replace the brake booster and master cylinder.Yes, replace the brake booster and master cylinder.


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1991 Thunderbird you hear a hissing sound under the dash. Brakes are hard when you try to stop Is this related?

Hello you need to change your master cylinder.


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You need to bleed the brakes.


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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.


Why would a Chevy Beretta idle high in park and neutral and in drive or reverse stutter badly and when stuttering the brakes are weak?

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Older cars had integral brakes, meaning that a proportional valve, which is the redundant part of a brake system that prevents total failure of brakes, if a brake line broke you will still have brakes on two wheels, and a master cylinder were all combined in one unit. A nonintegral brake unit typically uses a vacuum booster for power assist. The booster, the master cylinder, hydraulic modulator, and proportional valve are all separate units