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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

ABS dead

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Old Nov 12, 2004 | 11:11 AM
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From: Prince George, B.C.
ABS dead

Hey all, The rear ABS died on my '88 F-350 Diesel, tried replaceing the wire harness fron the frame to the rear diff, no luck, what else can I look for? I need help quick because its winter now and this truck is deadly on the ice without it, the rear brakes lock before the front! I assume there is a brainbox under the dash to controll it, should I be looking that that or the pump first?
 
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Old Nov 12, 2004 | 12:44 PM
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This should get you started.

Originally Posted by HardScrabble
Here is a link to the thread where I fixed my RABS. It has a link to a tutorial on RABS by Raybestos. It also tells how to pull the error codes.

antilock brake light

Here is a link to an article about RABS

Troubleshooting RWAL Systems, Bill Williams, Brake & Front End, September 1999

Here is the link to the tutorial at Raybestos

ANTI-LOCK BRAKES | Kelsey-Hayes RWAL Anti-Lock Brakes
 
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Old Nov 13, 2004 | 08:34 PM
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Thanks, I'll go and test the system tomorrow. The freezing rain we got here last night reminded me why these trucks suck without abs.
 
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Old Nov 14, 2004 | 04:37 AM
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Hell,my ABS is really off. Back only locks,front doesnt. Then if you apply a little too much pressure,wheel lock. ABS light doesnt comeon. Front doesnt lock either. Just keeps rollin. It's scarry knowing if I gotta stop hard,only my rear wheels will stop me and this is my only car and daily driver.
 
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Old Nov 14, 2004 | 11:58 AM
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From: Kapaa, Hawaii
the wire harness to the rear diff would not be the cause because the speedo probably would die too. I had a similar problem with my brakes. the back would lock up after being stomped to the floor because brakes would feel as if they were gliding ( while pulsing) then send me into panic braking. found
problem with abs. Here we don't have ice so I disconnected valve harness
that is located inside frame rail under driver side and tested base brake. it was fine so that is all I use. I would recommend starting there I think it is the proportionate valve.
 
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Old Nov 14, 2004 | 02:28 PM
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Originally Posted by Cruiseomatic
Hell,my ABS is really off. Back only locks,front doesnt. Then if you apply a little too much pressure,wheel lock. ABS light doesnt comeon. Front doesnt lock either. Just keeps rollin. It's scarry knowing if I gotta stop hard,only my rear wheels will stop me and this is my only car and daily driver.
Does your ABS light come on when you start your truck?

You should have a red brake warning light and a yellow ABS warning light.
 
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Old Nov 14, 2004 | 03:04 PM
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Yea,they do come on,then when i go to crank,shut off.
 
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Old Nov 14, 2004 | 05:49 PM
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Correctling previous statement:

My E-Brake warning light comes on when I try to crank it,but on the "On" position,Its off. And ABS light lights up on Ignition "On" Position,then shut off as I go to crank.
 
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Old Nov 17, 2004 | 06:51 PM
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From: Prince George, B.C.
I checked into my ABS Wiring and found that the wires are bad between the controller and the firewall, I checked all the wiring, the valves etc. and all seems fine, the only place I get nothing is the plug right at the controller so my guess is it is between the firewall and the controller. Oh, the controller is fine, I hooked it up in another truck and all was well.
 
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Old Nov 21, 2004 | 07:55 PM
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From: Prince George, B.C.
The truck is fixed, the ground to the valves was bad, ran a new one and all is well. Thanks for the help.
 
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