Brake pedal goes to floor and dosent return.
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Freshman User
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Brake pedal goes to floor and dosent return.
Hello, I have a 1997 f250 HD with a 7.5L and I’ve just experienced the problem where, while the engine is running the brake pedal goes to the floor and dosent return unless pulled up manually. If the engine is off the pedal feels firm doesn’t go to the floor and returns. this happened after I replaced the rear drum brake shoes. Previously I had an abs light on but the pedal worked just fine, but after replacing the brakes shoes the light went off and now the pedal goes to the floor and sticks. I’ve tried bleeding the rear brakes and the abs system. I’ve heard y’all about replacing the abs system, the master cylinder and the brake booster. But I don’t have the money to replace all three as I assume it would be pretty expensive. I would like to just replace what is necessary. What could it be?
Elder User
Joined: Sep 2018
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From: NC
Take a look at the area under your master cylinder,. Is it wet with brake fluid down on the fender well? I had a problem with my truck where the proportioning valve went bad and was leaking. If it is wet underneath there ,start the truck and have someone watch the master cylinder for leaks as you hit the brakes.
Lead Driver
Joined: Oct 2016
Posts: 6,185
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From: Houston/Sugar Land
Hello, I have a 1997 f250 HD with a 7.5L and I’ve just experienced the problem where, while the engine is running the brake pedal goes to the floor and dosent return unless pulled up manually. If the engine is off the pedal feels firm doesn’t go to the floor and returns. this happened after I replaced the rear drum brake shoes. Previously I had an abs light on but the pedal worked just fine, but after replacing the brakes shoes the light went off and now the pedal goes to the floor and sticks. I’ve tried bleeding the rear brakes and the abs system. I’ve heard y’all about replacing the abs system, the master cylinder and the brake booster. But I don’t have the money to replace all three as I assume it would be pretty expensive. I would like to just replace what is necessary. What could it be?
Thread Starter
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Freshman User
Joined: Sep 2018
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Take a look at the area under your master cylinder,. Is it wet with brake fluid down on the fender well? I had a problem with my truck where the proportioning valve went bad and was leaking. If it is wet underneath there ,start the truck and have someone watch the master cylinder for leaks as you hit the brakes.
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
If you didn't disconnect any brake lines, air in the system should not be the problem. The two things that come to mind are the booster or the rear brakes have not been adjusted properly. Did you do proper rear brake adjustment after install? Can you hear any hissing from your brake booster when the pedal is pressed? Sandy
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Oh I have seen this one before, you have a faulty brake booster. You can conform this by disconnecting and plugging the vacuum to the booster while the engine is running, you will see the brake pedal return to the up position.
This problem has nothing to do with potentially improperly adjusted rear brakes, the pedal would not stick to the floor even if that was the case.
This problem has nothing to do with potentially improperly adjusted rear brakes, the pedal would not stick to the floor even if that was the case.
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Thread Starter
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Freshman User
Joined: Sep 2018
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Oh I have seen this one before, you have a faulty brake booster. You can conform this by disconnecting and plugging the vacuum to the booster while the engine is running, you will see the brake pedal return to the up position.
This problem has nothing to do with potentially improperly adjusted rear brakes, the pedal would not stick to the floor even if that was the case.
This problem has nothing to do with potentially improperly adjusted rear brakes, the pedal would not stick to the floor even if that was the case.
Thread Starter
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Freshman User
Joined: Sep 2018
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If you didn't disconnect any brake lines, air in the system should not be the problem. The two things that come to mind are the booster or the rear brakes have not been adjusted properly. Did you do proper rear brake adjustment after install? Can you hear any hissing from your brake booster when the pedal is pressed? Sandy
FTE Legend
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From: Ottawa, Ontario
Thread Starter
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Freshman User
Joined: Sep 2018
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alright, looks like I’m getting a brake booster then. Won’t be too soon though, maybe next weekend. Thanks again! I’ll keep y’all posted if that fixes the problem.
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Freshman User
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well I managed to get a new one sooner than expected, I installed it and it did not fix the problem. What do I do now?