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Brakes locking up

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Old Feb 10, 2015 | 08:45 AM
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Default Brakes locking up

1992 Ford F-150 5.0L automatic

first incident happened around the fall of last year, the brake light and the ABS light came on, I pulled it over and the back brakes were smoking. I shut it off, turned it back on, lights were off and stayed off, vehicle drove ok.

The brake light and the ABS will still come on now and then, but not every day, not every drive, just seems to do it when it's warm or been driven for a while, and not every time does the brakes seem to partially seize.

Coming down the interstate the other day, I noticed a shutter, kinda felt like maybe my front end was out, no brake lights or anything.
Next day, driving across town, vehicle is shuttering really bad, Brake light and ABS light came on, I pull it over, can smell the rear brakes, shut it off, leave it, turn it back on, get going, same thing over and over for a few times. Finally got it to a location out of traffic, left it for a while, came back, started up, no codes, drove it home, no shutter.

The shutter just started and isn't present all the time, for example, I drove it today, no problems, no brake light, no ABS light, no smell coming from the brakes, no shutter.

This is a secondary vehicle but being used as a daily driver right now until primary vehicle is fixed.

Where would be a good place to start looking?
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Old Feb 12, 2015 | 02:33 PM
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Bleed your brakes and take a look at the wheel cylinders (rear). Then possibly consider replacing the Rear ABS valve.
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Old Feb 12, 2015 | 07:21 PM
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Sounds like your back brakes might be toast. When was the last time you had them serviced ?
There may also be some issues with your emergency brake cables or on rare occasions, the rubber flex line can partially collapse - you can force fluid through to apply the brakes but they can't push the pressure back to release.
All in all, time for a brake job.
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Old Feb 22, 2015 | 10:40 AM
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Check your drum diameter.

If they get larger than spec, it can cause a shoe to hang/drag.
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Old Feb 23, 2015 | 12:24 AM
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It's possible that the rear brake hose going from the body to the differential is clogged and causing the rear brakes to stay applied when you let off the brakes.
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Old Feb 24, 2015 | 10:41 PM
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You likely need a new ABS hydraulic unit.

Last edited by Sam F; Feb 24, 2015 at 10:44 PM.
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Old Feb 25, 2015 | 06:53 PM
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Thanks everyone for the replys, I'll check these things once the weather gets better and report back on my findings.
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Old Feb 25, 2015 | 08:30 PM
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Originally Posted by miataman
Check your drum diameter.

If they get larger than spec, it can cause a shoe to hang/drag.
^^^ this is a good thought. Drums expand as they get hot, and if they're already oversize, then heat up and expand, that could cause issues. A new set of drums can be had for about $50 a drum these days.
I changed mine just because the old ones were rusty looking (but I do stuff like that).
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