Rear ABS question
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Mountain Pass
Joined: Apr 2012
Posts: 215
Likes: 1
From: Charlotte, NC
Rear ABS question
1995 F-250 XL 5.8L E4OD. 54K miles (yes, that's all). Had to hit brakes hard yesterday to avoid accident and rear tires locked and slid about 30 feet. Avoided accident though.
Why didn't the Rear ABS work? No CL light. No "Rear ABS Light," except when I engage parking brake. Replace rear ABS sensor? What else should I test/replace? Thanks in advance.
The truck was my great Uncle's farm truck and I acquired it from his estate about 3 months ago. He was meticulous with maintenance.
Why didn't the Rear ABS work? No CL light. No "Rear ABS Light," except when I engage parking brake. Replace rear ABS sensor? What else should I test/replace? Thanks in advance.
The truck was my great Uncle's farm truck and I acquired it from his estate about 3 months ago. He was meticulous with maintenance.
i ain't rite
Joined: Mar 2005
Posts: 65,601
Likes: 5,629
From: Marlboro Mental Hospital.
the RABS on these trucks was marginal at best, and a lot of times it did not work from new.
all of my trucks had it disabled and bypassed before there was 100 miles on the speedometer.
all of my trucks had it disabled and bypassed before there was 100 miles on the speedometer.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
We debate the RABS effectiveness topic about every other month. A quick search will yield the results.
FYI...if there was an issue with the RABS system it will not trigger a Check Engine Light (CEL). There is no connection between the RABS system and the powertrain control computer.
My experience with three OBS trucks was positive for how the RABS reacted under various conditions. My old 1992 F350 never triggered an ABS light, but I knew it was not working. I replaced the RABS hydraulic control module located on the driver side frame rail as I was repairing other issues related to dragging rear brakes and a soft pedal. After replacing that piece the RABS operated just like it did on my two previous 1993 Lightnings.
Another observation per your comment: " No "Rear ABS Light," except when I engage parking brake." When engaging the parking brake you should get the red Brake light, not the yellow ABS light.
FYI...if there was an issue with the RABS system it will not trigger a Check Engine Light (CEL). There is no connection between the RABS system and the powertrain control computer.
My experience with three OBS trucks was positive for how the RABS reacted under various conditions. My old 1992 F350 never triggered an ABS light, but I knew it was not working. I replaced the RABS hydraulic control module located on the driver side frame rail as I was repairing other issues related to dragging rear brakes and a soft pedal. After replacing that piece the RABS operated just like it did on my two previous 1993 Lightnings.
Another observation per your comment: " No "Rear ABS Light," except when I engage parking brake." When engaging the parking brake you should get the red Brake light, not the yellow ABS light.
FTE Chapter Leader
Joined: May 2006
Posts: 12,344
Likes: 1,319
From: Central Mississippi
These drums are not the best after sitting for any length of time.
If not driven on a daily basis, they'll lock in a heartbeat.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Plenty of reasons for why the rear brakes locked up even beyond a component failure like I had. Best bet for any new to you vehicle is to remove the rear drums to inspect the shoes, hardware and axle seals. Highly suggest to give the front calipers, pads and wheel bearings/seals a good inspection as well.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Good question. Since your truck has RABS II you could see if there is a fault code stored. To the best of my knowledge only the red Brake light should be illuminated with the parking brake engaged.
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