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Old February 7th, 2007, 03:04 PM   #1
mudrunner456
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Default Need help with brakes 93 F-150

I am using a 93 F-150 with a 351 for a tow rig this year. The miles are low and its still a good truck. But the rear brakes have been giving me headaches. They keep on locking up, I've had the brakes changed twice and that didn't do anything. I tryed pulling the abs senser and that did nothing. When it happens it ussually in a hard braking situation and then the abs light and e-brake in place ight come on and stay on. I've been told to check the porportioning valve or master cylinder. Also see if it isn't the e-brake for some reason. I've had it in a few shops and they cant figure it out. Tomarrow (Thursday) im goin to pull off the drums and see if i cant disconnect the e-brake and maybe thats it. Any other ideas would be greatly appreciated.
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Old February 7th, 2007, 03:17 PM   #2
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1) When do they lock up?? Only when towing?? (I know you posted - but is it loaded or unloaded)

2) If it were my vehicle, the first thing I would do is check the wheel cylinders. I have seen wheel cylinders cause this - but it was on a dodge caravan. Make sure when you check them, you check them by having someone push the brake pedal while you've got a prybar preventing the movement of one shoe on one side - and make damn sure the drum on the other side is on before the person in the cab pushes the pedal.....movement of the shoe your not prying on should be smooth and it should come back nice and easy when the pedal is released......

Secondly, how are the pins holding the shoes to the backing plates? I've seen them bend occasionally which will cause the shoes to hit the drums in a cocked position and cause them to lock up.......

Are the brakes adjusted up right?? If it only happens when your towing, its possible the proportioning valve is screwed up........
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Old February 7th, 2007, 06:25 PM   #3
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thanks for the tips, it happens all the time, not only when towning. Just whenever you press the brake pedal hard. The were just redone last week with new hardware. Im goin to check if the wheel cylinders were changed also. Do you think it could have anything to do with the e-brake?
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Old February 7th, 2007, 06:48 PM   #4
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I guess I would ask if the drums have been replaced yet? the reason I ask is how well do the shoes fit the dia. of the drum? if they lay tight to the radious of the drum its most liekly the problem. if they don't have a proper arc then the shoes will grab hard like you discribe. remove the shoes from the side that grabs the most and set them in the drum and see how they fit. if the they don't rock from one end to the other by at least of 1/4" then they are not arced enough. one cure is to just back off the brake adjusters and see how it stops. ussally about 5-8 complete turns will do the trick. it will lower your brake pedal height so don't be alarmed. try it and see if the grabbing stops. by backing the adjusters off you force the shoe to use one end rather then the whole face.
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Old February 7th, 2007, 07:14 PM   #5
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If the ABS and the red BRAKE light are coming on then you may have an issue with the switch on the proportioning valve.

How do you get the lights to go off?
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Old February 7th, 2007, 08:34 PM   #6
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Quote:
Originally Posted by Jeeperz Creeperz View Post
If the ABS and the red BRAKE light are coming on then you may have an issue with the switch on the proportioning valve.

How do you get the lights to go off?
That's what's throwing me for a loop as well - the fact that both the ABS and red brake light are comming on


But personally, I doubt it's an E-brake issue - unless the E-brake is stuck on (but even then the shoes should heat/glaze over and not work.....)
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Old February 7th, 2007, 09:17 PM   #7
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to get them to come off i have to shut the truck off and then turn it back on. But even then the brakes are still stuck. To get the brakes unstuck i have to let it sit for a while and then everything goes back to normal. Thanks for the help because i am totally lost. Is there a switch on the porportioning valve on this truck, and were on the truck can i find it? Under the hood, near the rear?
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Old February 7th, 2007, 10:45 PM   #8
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Sounds like the height sensing proportioning valve. Located in the rear of the vehicle over the rear diff. on a crossmember.

Is the vehicle lifted AT ALL? If so, this valve will not work right.

If not, it could be bad.
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Old February 8th, 2007, 09:58 AM   #9
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Bring the truck over sometime i'll help you figure it out.
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Old February 8th, 2007, 10:05 AM   #10
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Rear brake hose could be acting up also. Also could have grooves on the backing plate where the shoes ride.



Just put rear disc on it!!!!



Yeah what he said just bring it over and let him help you.
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Old February 8th, 2007, 10:48 AM   #11
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Originally Posted by chris1044 View Post
But personally, I doubt it's an E-brake issue - unless the E-brake is stuck on (but even then the shoes should heat/glaze over and not work.....)
Nothing in the e-brake setup, other than the e-brake pedal, will turn on the red brake light. The red brake light will only come on if you apply the e-brake (push the e-brake pedal down) or you have a base brake system fault.
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Old February 8th, 2007, 10:49 AM   #12
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Quote:
Originally Posted by MuddyPaws View Post
Sounds like the height sensing proportioning valve. Located in the rear of the vehicle over the rear diff. on a crossmember.

Is the vehicle lifted AT ALL? If so, this valve will not work right.

If not, it could be bad.
I've never seen an F-150 with a height sensing proportioning valve...
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Old February 8th, 2007, 10:50 AM   #13
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Originally Posted by mudrunner456 View Post
to get them to come off i have to shut the truck off and then turn it back on. But even then the brakes are still stuck. To get the brakes unstuck i have to let it sit for a while and then everything goes back to normal. Thanks for the help because i am totally lost. Is there a switch on the porportioning valve on this truck, and were on the truck can i find it? Under the hood, near the rear?
If I remember correctly, it should be on the drivers frame rail below the master cylinder (or in that vicinity).
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Old February 8th, 2007, 02:19 PM   #14
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thanks for the help i'll check those things today.
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