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post #1 of 9 (permalink) Old 11-29-2010, 07:37 PM Thread Starter
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Rear brakes locking up

I have had a problem with the brakes for a little while and have been replacing parts trying to get the problems fixed since I got the truck. The pedal was low, and the right rear wheel was locking up when cold, so I replaced shoes, drums, spring kit and wheel cylinders. Still didn't bring my pedal up so I replaced the master cylinder, still no change, so I did front calipers, rotors and pads. Still didn't work so tried to bleed all four wheels again, found air in right rear wheel again so I replaced again that wheel cylinder, pedal came up felt good for two weeks and I am loosing pedal and both rear wheels are locking up. Any ideas? Really getting frustrated!!!!

Last edited by myf150s; 11-29-2010 at 08:16 PM.
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post #2 of 9 (permalink) Old 11-30-2010, 02:36 PM
 
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pin hole(rust)in brake line?


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post #3 of 9 (permalink) Old 11-30-2010, 04:32 PM Thread Starter
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I was thinking rear flex line, but there is nothing wet that I can see.
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post #4 of 9 (permalink) Old 11-30-2010, 07:06 PM
 
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Do those trucks have equalizer valves for the rear brakes? Something to do with that, maybe?

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post #5 of 9 (permalink) Old 12-01-2010, 12:35 AM
 
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Have you checked the ABS sensor on the rear diff. I had an issue when the truck has been sitting over night and if it was damp when I tried to drive, the rears would lock up at very low speed, < 5kph. Turns out there was a crack in the ABS sensor and the moisture messed it up. Replaces it and no worries since.


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post #6 of 9 (permalink) Old 12-01-2010, 04:35 PM Thread Starter
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I don't think that there is an equalizer, but there is a block up under the master cylinder with a bunch of wires coming from it, I think that it has something to do with the rear ABS. But it seem to lock up wether it's wet or dry, Almost feels like the rear brakes are too sensitive. The other parts that I have replaced were causing problems themselves, I am wondering if having everything else fixed caused something that was weak to fail, but I don't know what else to replace that would cause that problem. Going to replace rear shoes and rear flexline this weekend.
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post #7 of 9 (permalink) Old 12-01-2010, 09:25 PM
 
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The equalizer/proportioning valve on my old Nissan was attached to the frame between the cab and rear wheel. Got a manual?

Why are you replacing the rear shoes again? Didn't you just do that?

If it has no proportioning valve, then I think shelbyx1 has got to be right. Could be a loose piece of rust or crap in the brake line, causing a restriction.

Also check all the lines to see if it got crimped somehow. Flush out the lines, end-to-end, and blow them out with compressed air, and replace the fluid with fresh stuff of the correct type.

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post #8 of 9 (permalink) Old 12-02-2010, 12:43 AM
 
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There is a proportioning valve, at least there is on mine. The dealer I got the truck from had to replace it because the ABS light would not turn off.


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post #9 of 9 (permalink) Old 12-03-2010, 07:34 PM Thread Starter
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So, funny thing, my neighbour told me that his Dad screwed up putting his rear shoes on backwards (front shoe to the back....) and said that his wheel started locking up. So I went and took a closer look and sure enough the pasenger side shoes were mixed up. I changed them back to the right way, and now all is good!!! It was something that even the mechanic who changed the Shoes the first time did't notice. They should make it more obvious whitch shoe goes where.The only difference is just where the shoe sits on the backing. Thanks everyone for the suggestions, P.S there is supposed to be an equalizer just ahead of the fuel tank.
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