brakes locking up? - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 01-22-2012, 01:02 PM Thread Starter
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brakes locking up?

my brakes have always locked up as soon as I hit them when wet in the morning or after sitting for a while. Once warmed up and dried out they were fine. This time it basically never went away. Anything around 50% braking and the front end completely locks up and the truck just slides. I thought it was passenger side so i replaced that caliper but it didnt help. Any ideas? These trucks dont have a proportioning valve right?

1997 CC SB. Stage 1s, 17*hpop, S&B CAI. 4" straight pipe, TW tunes, zf5 swap
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post #2 of 13 Old 01-22-2012, 01:59 PM
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Yes they have a proportioning valve, straight below the master cylinder in the frame rail. Are you sure your rear brakes are working at all? Maybe the rears aren't adjusted properly causing the front to do all the work.

Jack
97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
1.0 housing w/ wwII, 203* t-stat, diy 6637, 4" exhaust
Diy intercooled, 6.0 fan, Diy 140v Idm, Isspro Ev gauges
On board air, E-fuel, 6" lift on 35's
322000 miles
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post #3 of 13 Old 01-22-2012, 02:19 PM Thread Starter
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I haven't checked yet. Even if they are way out of adjustment I didn't think it would make the fronts totally lock up. I'll check thanks for the info

1997 CC SB. Stage 1s, 17*hpop, S&B CAI. 4" straight pipe, TW tunes, zf5 swap
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post #4 of 13 Old 01-22-2012, 02:31 PM
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Other thing that comes to mind is what kind of front pads are you using and are the rotors smooth?

Jack
97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
1.0 housing w/ wwII, 203* t-stat, diy 6637, 4" exhaust
Diy intercooled, 6.0 fan, Diy 140v Idm, Isspro Ev gauges
On board air, E-fuel, 6" lift on 35's
322000 miles
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post #5 of 13 Old 01-22-2012, 04:36 PM Thread Starter
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ya rotors are smooth. Pads are just the advanced auto golds

1997 CC SB. Stage 1s, 17*hpop, S&B CAI. 4" straight pipe, TW tunes, zf5 swap
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post #6 of 13 Old 01-22-2012, 04:44 PM
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I'm not familiar with advance pads, is that organic, semi metallic, metallic, or ceramic?

Jack
97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
1.0 housing w/ wwII, 203* t-stat, diy 6637, 4" exhaust
Diy intercooled, 6.0 fan, Diy 140v Idm, Isspro Ev gauges
On board air, E-fuel, 6" lift on 35's
322000 miles
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post #7 of 13 Old 01-23-2012, 01:18 PM Thread Starter
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im almost positive they are ceramic. Do you recommend one over the other?

1997 CC SB. Stage 1s, 17*hpop, S&B CAI. 4" straight pipe, TW tunes, zf5 swap
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post #8 of 13 Old 01-23-2012, 01:59 PM
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I almost always use semi metallic. The metallic and ceramic pads can be really finicky if not seat exactly like the manufacture recommends. I feel that the ceramic pads should be for high speed applications.

Jack
97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
1.0 housing w/ wwII, 203* t-stat, diy 6637, 4" exhaust
Diy intercooled, 6.0 fan, Diy 140v Idm, Isspro Ev gauges
On board air, E-fuel, 6" lift on 35's
322000 miles
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post #9 of 13 Old 01-25-2012, 07:33 AM Thread Starter
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ok, rear brakes are adjusted right. I replaced the master cylinder, both calipers, pads, the rubber lines from frame rail to caliper and the ABS/speed sensor on the rear pumpkin. Brakes still locking up and getting worse. Only thing thats left is the proportioning valve right? Ford wants $480 for one. Know of anywhere else to find one?

1997 CC SB. Stage 1s, 17*hpop, S&B CAI. 4" straight pipe, TW tunes, zf5 swap
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post #10 of 13 Old 01-25-2012, 02:17 PM
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Holy cr*p, that's expensive. You could try a used one from ebay or car-part.com. This isn't the first time that I've heard of one being a problem but its pretty rare. Here's Napa's NAPA AUTO PARTS

Jack
97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
1.0 housing w/ wwII, 203* t-stat, diy 6637, 4" exhaust
Diy intercooled, 6.0 fan, Diy 140v Idm, Isspro Ev gauges
On board air, E-fuel, 6" lift on 35's
322000 miles
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