76 f-150 brake problems
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4wd Low
Joined: Feb 2023
Posts: 10
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76 f-150 brake problems
I’ve got a 76 f150 with a 390
front brakes start to drag and eventually lock up after about 10 mins of driving.
I’ve already replaced, front calipers, pads, proportioning valve, booster.
just ordered new lines for the front.
I’ve got good bleed on them already, and they work amazing until they don’t..
any ideas?
front brakes start to drag and eventually lock up after about 10 mins of driving.
I’ve already replaced, front calipers, pads, proportioning valve, booster.
just ordered new lines for the front.
I’ve got good bleed on them already, and they work amazing until they don’t..
any ideas?
Cargo Master
Joined: Jul 2005
Posts: 2,311
Likes: 367
From: Kansas
how did you set the pushrod length when you got the new booster installed? sounds like it may be slightly applying the brakes then they start heating up and eventually get tighter...if replacing the front brake hoses doesn't fix the issue, I would check the pushrod.
Hotshot
Joined: Feb 2004
Posts: 10,808
Likes: 2,604
From: The Shenandoah Valley
Is it a 2wd or 4wd? If 4wd it has three front brake hoses, one to each wheel from a tee on the axle, and the third from tee up to frame. This third hose could develop an internal flaw that would block return of pressure and hold front brakes applied. It could happen to the other two hoses, but often it only does one at a time there.
Laughing Gas
Joined: Aug 2020
Posts: 821
Likes: 292
From: Pelham Alabama
X2 With tbear.
The old rubber hoses collapse on the inside and sometimes act like a check valve.
While they are locked up, remove the rubber hose to see if they release.
I always put a rag around the fitting as fluid will probable be under pressure.
My .02 worth..
The old rubber hoses collapse on the inside and sometimes act like a check valve.
While they are locked up, remove the rubber hose to see if they release.
I always put a rag around the fitting as fluid will probable be under pressure.
My .02 worth..
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4wd Low
Joined: Feb 2023
Posts: 10
Likes: 0
it started after sitting for a couple years, I put the new booster on it before I had an accident in it. Then after I got it back on the road it was fine for a couple months then started doing this
Lead Driver
Joined: Oct 2018
Posts: 7,877
Likes: 2,366
In that case the rod between the master and booster is fine if it used to work. booster and master are probably good, though if they're older and have sat you can't rule them out.
A hose could be the problem , though in all the years with all the rigs I've worked on I've yet to see it. but you could try replacing them.
What releases the brakes when they lock ?
A hose could be the problem , though in all the years with all the rigs I've worked on I've yet to see it. but you could try replacing them.
What releases the brakes when they lock ?
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Moderator
Joined: Apr 2011
Posts: 313
Likes: 93
From: San Antonio, TX
You could do a quick test to check the brake lines by pumping the brakes all the way to the floor while it's running half a dozen times and then try to roll away. If its the lines they will stick or drag.
I had a line collapse on my Ford Class C motorhome. I was in the middle of nowhere. I vise gripped that side and took it easy for the remainder of my trip and fixed it when I got home.
I had a line collapse on my Ford Class C motorhome. I was in the middle of nowhere. I vise gripped that side and took it easy for the remainder of my trip and fixed it when I got home.
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Logistics Pro
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From: East Central Ia
In that case the rod between the master and booster is fine if it used to work. booster and master are probably good, though if they're older and have sat you can't rule them out.
A hose could be the problem , though in all the years with all the rigs I've worked on I've yet to see it. but you could try replacing them.
What releases the brakes when they lock ?
A hose could be the problem , though in all the years with all the rigs I've worked on I've yet to see it. but you could try replacing them.
What releases the brakes when they lock ?
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
Next time you could open the bleeders and see if it frees up.
If so then fluid is not going back to the master and more checking is needed.
If you think it is the push rod you could loosen the master nuts some to add some gap between rod and master.
Dave ----
If so then fluid is not going back to the master and more checking is needed.
If you think it is the push rod you could loosen the master nuts some to add some gap between rod and master.
Dave ----
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Spooky
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Aug 18, 2004 08:16 AM