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Old 04-22-2014, 12:35 PM
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Brakes locking up

Ive researched this topic and cant find anything close, so here I am.....

I have a 96 F250 ECSB 4x4 5speed. Problem I am having is when i mash on the brakes, one or both of the rears lock up. No ABS or Brake light on dash. I have bled the brakes countless times. All new brake lines, MC, Vacuum pump, Proportioning valve, shoes, and hardware just did the proportioning valve today with no change. I am at my wit's end. Any ideas?


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Old 04-22-2014, 12:36 PM
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Also when brakes lock up the pedal goes soft. And then returns to normal.


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Old 04-23-2014, 02:09 PM
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Does the pedal seem to suck to the floor and maybe not return as quickly as you think it should? If so, check the booster. Also when the shoes were replaced are the shoes with the longer friction material surface to the rear on each wheel? Are the ABS and Brake lights functioning on startup? Cheers!
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Old 04-24-2014, 01:44 PM
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As far as the pedal goes, it feels as if the ABS is sensing the lock up and reducing pressure to free em. There are no lights on, only at startup an then immediately they go out.

Im going to open it up tomorrow and reassess. Ill post results.


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Old 04-25-2014, 10:25 AM
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New shoes today. Longer shoes to the rear. No leaking inside drum. Cleaned everything up. Disconnected PB cable just in case. Everything back together and still locking rear up. Wont do it in reverse, but forwards it does. :/


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Old 04-25-2014, 12:50 PM
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On the advice of a professional mechanic, I ordered a rear brake hose. Speaking with another friend he does not believe that could be the cause. So....any possibility it could be the hose? Friend thinks it is just an axle vent hose and had nothing to do with brakes. But from what the threads i have read, people keep mentioning it.


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Old 04-25-2014, 08:54 PM
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Sometimes old hoses can collapse internally which can cause pressure not to release when the pedal is released. Not sure that would cause your lockup problem. Cheers!
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Old 04-27-2014, 06:41 PM
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New brake hose and bleeding of the brakes did not help. Tomorrow I will try a VSS. Got my Snap On K-20 key for my Modis coming tomorrow so I shall be able to scan for ABS codes too.


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Old 04-28-2014, 02:16 PM
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Well, speed sensor didnt make a lick of difference.

Im about ready to say the heck with it and sell this thing.


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Old 04-28-2014, 06:49 PM
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Bled and bled and bled brakes again this evening. Still happening.


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