Question about 1992 Ford F250

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1992 F250 460 engine AOD with 83000, miles.....Brakes seem to work fine for stopping but while at a stop light for a few seconds, the pedal slowly sinks down to just above the floor. Checked my fluid level, it seems to be ok. Any ideas what can cause this?

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Poss an air leak in the vacuum colector.

Posted on Oct 01, 2010

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  • Master
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Sounds like master cylinder

Posted on Oct 01, 2010

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1 Answer

Is there air in my ABS of my '92 thunderbird lx?


ABS isn't so much a thing as a system, but if you want to know how to bleed your brake system you place a tranparent tube on one of the brake cylinder valves/nipples, then imerse the end of the tube in a small bottle with some brake fluid in. Then you get someone to press the pedal down slowly as you open the valve/nipple. They should pump a few times slowly, then with the pedal down close the valve/nipple. Check to see if the pedal is harder. You should do this with both front and rear brakes, as they are seperate lines. The ABS is a system that ballances the brakes to stop slewing across the road when you apply the pedal too hard. The part attached to the master cylinder is actually a servo, which should have a tube go from it to the inlet manifold of the engine. This causes a vacuum in the servo, which when applying the brakes helps the brakes by taking away some of the pressure needed. If this pipe is broken or not connected, then your sevo won't work. There is an easy way to check your servo. Press the pedal down, then start the engine, you should feel the pedal go down a bit more. If it does not, check the servo tube.

May 20, 2012 | 1992 Ford Thunderbird

1 Answer

When coming to a stop, the brakes work fine until I get almost stopped, then the pedal will push down further and brakes will come on hard, and stop vehicle hard, what could be the problem?


Sounds like your master cylinder is bad on your brake system. If you are stopped in your driveway(not on the street) leave the vehicle in park. Start the car and place your foot on the brake with light pressure and keep this pressure on the pedal. If the pedal continues to drop slowly to the floorboard your master cylinder is leaking past the primary piston in the master cylinder. If this is the case have this repaired immediately. Your brakes could just all of a sudden not be there the next time you apply them when you need to stop.

Apr 05, 2012 | 1995 Buick LeSabre

1 Answer

Had a defective brake light switch replaced on a 1999 Escort SE. A friend managed to removed the old one ( had to kind of twist it out) but was too fat to fit under the dash to install new one. I had a...


WEll, if the switch were to be too far down, essentially pressing on the brakes, this can happen, release the brake light switch and allow the pedal to come to it's normal stop, then adjust the switch for that position.

Aside from heat of brakes, other damage very unlikely.

Sep 06, 2010 | 1997 Ford Escort

1 Answer

Brake pedal went out on me going about 65 on the highway, was able to pump enough to get it under control. Brake company said brakes and diaphragn were fine, needed new master cylinder. Brakes went out...


it sounds like you've got an issue with the engine vacume line going to the booster. there's an in line one way check valve that keeps vacume in the booster in case of a loss of vacume, like if your truck stalled while driving. but there should always be vacume with the engine running. so check the vacume line going to the brake booster for kinks obstructions, and leaks.

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1 Answer

While in stop and go traffic my brake pedal went


check the brake fluid level, if its low, there may be a leak, if the level is good, the master cylinder is bad.

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1 Answer

93 dodge dynasty brake pedal stiff wont apply brakes


your power brake booster needs replaced ,it work off engine vacuum and when the seal inside leak there is no power assist for the brakes

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2 Answers

Rear brakes wont apply consistantly


1- brake system low on fluid,
2- improperly bled (air in lines).
3- Master cylinder (applies equal pressure to all 4 cylinders) is bad.

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