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Generation 7 1980-1986 F150, F250, F350

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  #1  
Old 10-31-2019, 11:19 PM
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Advice f350 drw front brakes

What are typical problems with these old bullnose for the front calipers to drag and get excessively hot?

I just did calipers and pads last night because they were sticking so bad the truck would come to a stop when you pushed in the clutch or coasted in neutral. It's still dragging and getting very hot but not causing it to slow down like it was.

Also, this is the new tow pig since my 2wd short bed isn't much of a work truck.
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Old 10-31-2019, 11:52 PM
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Nice truck. I've seen it happen when the master cylinder wasn't returning all the way. Either because the rod from the pedal to the booster was too long, the link from the booster to the master was too long, or the piston was sticking in the bore.

Loosen the nuts holding the master to the booster an 1/8 of an inch or so, and see if it frees up.

Not the only possible problem, but where I'd start if it was mine. Good luck!

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Old 11-01-2019, 01:12 AM
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The master was recently changed because they noticed the pedal being weird which was due to the entire pad being gone with just a metal plate left so the master could easily be a possibly.
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Old 11-01-2019, 05:40 AM
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Nice truck, and what Blue said. I've also had the rubber brake lines swell, or shrink on the inside not allowing the fluid to return from the caliper to relieve the brake pressure.
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Old 11-01-2019, 06:58 AM
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Brake hose is my first suspect in such cases. The inner lining will break down, then start to break loose. It then allows the fluid to pass, then shuts the door and won't let it return.
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Old 11-01-2019, 06:03 PM
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The only thing with it being a rubber line is both calipers drag and get just as hot. Last time this happened was on a jeep and both calipers had seized from sitting. Swapped those and never had the issue again. I bought brake lines last night as well as enough fluid to flush the system.

Is there anyway the metering valve in the prop valve could cause this issue?
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Old 11-01-2019, 06:24 PM
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Not to my knowledge, but anything is possible.
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Old 11-01-2019, 08:26 PM
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There is no metering valve. That is an abs modal for the rear brakes.
Front brakes come from the master, right to the calipers on these trucks.

My 90 f 250 had the big can booster on it, it went bad 2 times, holding the brakes on so hard it caught fire second time.
It was somehow leaking vacuum back into the master cylinder, putting pressure aginst it from the back side.
I put the smaller booster on, never had another problem

Truck still stops great.
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Old 11-01-2019, 09:40 PM
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The exploded view for the prop valve for this truck shows a metering valve inside the prop valve... the valve was listed for 80-86 trucks and looks the same as the one in mine.
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Old 11-01-2019, 10:10 PM
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As a rule they never go bad. The job is to center if a line leaks to keep from losing all your fluid.
I was mistaken. From The picture it looks like your front end is from a 92-97 f 350
When bleeding the brakes you need to pull the plunger back to center, and hold it there with vice grips while bleeding, or you won't be able to properly get the air out of the system

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