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post #1 of 19 (permalink) Old 06-15-2010, 06:35 PM Thread Starter
 
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e-Brakes Seizing

I have a 2004 F150 4x4 and I am having a problem with my e-Brakes seizing. If I happen to slow down or in some cases just drivng down the road the e-Brakes go on and then I have to pull over so they can release themselves.

My ABS light has been going on and off. I went to a mechanic today and they did a reading and it showed that the rear ABS sensor was faulty and it registered almost nothing. SO the mechanic replaced the sensor. I drove about 22km - slowed down to turn off the hwy and it did it again. This time i don't have any ABS light coming on which is good. I have replaced the e-Brakes, the rotors, the pads, and the calipers.

I am heading into the dealer tomorrow - does anyone have any ideas?
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post #2 of 19 (permalink) Old 06-15-2010, 06:40 PM
 
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Is the cable catching on anything? LR

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post #3 of 19 (permalink) Old 06-15-2010, 06:47 PM Thread Starter
 
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I do not believe so.
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post #4 of 19 (permalink) Old 06-16-2010, 04:29 AM
 
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How do you know it's the parking brake? Seems kind of odd, considering it usually takes a deliberate physical effort to engage them. I really can't see any way for the parking brake to engage all by itself?

Also, it's usually a mechanically seperate system from the hydraulic brakes, so the ABS sensor wouldn't have any effect on the parking brakes. Parking brakes are completely mechanical.

(I'm assuming this is the common type of parking brake on 4-wheel disc vehicles -- ie. the little brake drum within the rear brake discs.)

My guess is you've actually still got something wrong with your ABS system. That CAN activate individual brake calipers/cylinders by itself? Or maybe a flakey master cylinder? Air in the hydraulic system?

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post #5 of 19 (permalink) Old 06-16-2010, 04:51 AM Thread Starter
 
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well there is all kinds of wear on the brand new shoes and lots of dust from them inside the rotor.when i replaced the e pads on the driver side was conpletly wore off so they must of bin wearing at some point before i got the truck.
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post #6 of 19 (permalink) Old 06-16-2010, 04:58 AM
 
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Check the endplay on the axle shafts. It could be an axle shaft bearing. Rear disc brakes require very tight tolerances for brake alignment.

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post #7 of 19 (permalink) Old 06-16-2010, 04:17 PM
 
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Quote:
Originally Posted by Grizzly View Post
well there is all kinds of wear on the brand new shoes and lots of dust from them inside the rotor.when i replaced the e pads on the driver side was conpletly wore off so they must of bin wearing at some point before i got the truck.
Interesting. Ordinarily, you'd think there should be no wear at all on the parking brake shoes, probably for the life of the vehicle.

Forget what I said earlier, it definitely sounds like something is mis-adjusted or sticking with your parking brakes. Check the entire mechanism, including the cable, to make sure the brakes are releasing all the way, when the parking brake pedal is released in the cab. Take the rear drum assembly apart and check for wear, dirt, corrosion. Clean & lube.

I can sort of see why the ABS light might have come on before. When you applied the brakes, the sticking parking brake was setting off the ABS system, because it detected one (or both) of the back wheels were going slower, or locking up when they shouldn't have been, thanks to the grabbing parking brake.

(I love troubleshooting -- too bad I'm not very good at it. )

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post #8 of 19 (permalink) Old 06-16-2010, 04:46 PM
 
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there is a tsb(08-11-1)for this concern,the park brake stays part engauged and heats up untill it expands and self energises untill you stop and let it cool down.


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post #9 of 19 (permalink) Old 06-16-2010, 06:39 PM Thread Starter
 
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thanks but i dont think i will get anything from the dealer about that.good to know.
anyways the dealer told me that the new fords are prone to this.so they will be going over the e brakes thurs and greases and cleaning them.hopefully fixes the problem.
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post #10 of 19 (permalink) Old 06-17-2010, 05:49 PM Thread Starter
 
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got the truck back today so far so good knock on wood.
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