antilock brakes
Thread Starter
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New User
Joined: Dec 2004
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Rear Antilock Indicator ON
Hi !!
I have a very odd behavior on my Ranger'90. Turn on engine (Rear Antilock indicator off) start driving (indicator off) once I reach 35MPH the Rear Antilock indicator turns on. Stop, park, turn engine off, turn engine on, indicator off, start driving and again, when I reach 35MPH the indicator comes back on.
Is this serious ? what should I do to fix the problem ?
The truck works 100% OK before and after the indicator started to turn on.
One more thing. It seems like the problem started after I took the truck to a body shop to fix a problem with the rear bumper because of a minor crash. The bumber had to be removed, fixed and reinstalled. The crash did not affect other than the rear bumper.
Thanks,
Ed.
I have a very odd behavior on my Ranger'90. Turn on engine (Rear Antilock indicator off) start driving (indicator off) once I reach 35MPH the Rear Antilock indicator turns on. Stop, park, turn engine off, turn engine on, indicator off, start driving and again, when I reach 35MPH the indicator comes back on.
Is this serious ? what should I do to fix the problem ?
The truck works 100% OK before and after the indicator started to turn on.
One more thing. It seems like the problem started after I took the truck to a body shop to fix a problem with the rear bumper because of a minor crash. The bumber had to be removed, fixed and reinstalled. The crash did not affect other than the rear bumper.
Thanks,
Ed.
Junior User
Joined: May 2004
Posts: 60
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From: Raleigh NC
Were you braked when you got hit? Or was the truck parked when you got hit, with parking brake on? initially I would agree with Ken00, he usually knows what he's talking about! But as a side thought, is it possible that the rear brakes were engaged during the accident? My thought is that the ABS sensors are now picking up a low spot due to uneven wear on the brakes, kinda like a flat spot on tires when you lock 'em up. I have nothing to base this on, but its an idea! good luck!
Post Fiend
Joined: Feb 2003
Posts: 6,940
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From: Eastern WA
Um, if I'm not mistaking, on trucks with RABS the VSS (vehicle speed sensor) located on the top of the rear end is the only sensor used to determine wheel lockup. Abnormal deleceration (ie, attempting to lockup) of the rear tires is detected by the VSS, and the system is designed to recognize this and respond by releasing some hydraulic pressure to the rear wheel cylinders.
Senior User
Joined: Nov 2003
Posts: 478
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From: ut
Cowboybilly is correct. The VSS sends axle speed info to a controller (I think under the dash) which in turn, controls the RABS module, located on the inboard frame rail just forward of the fuel filter. The module then will relieve brake pressure in a skid situation, as monitored by the VSS. The majority of the posts on FTE about this seem to point to the VSS as the culprit, but my own experience is with a bad module due to moisture contaminated brake fluid. In your case, I would look at the wiring very carefully, especially at the VSS.
As the name implies, RABS is for "Rear Anti-Lock Brake System" only.
As the name implies, RABS is for "Rear Anti-Lock Brake System" only.
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Joined: Dec 2004
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Thank you ALL for your advice !!!
Ken, I'll read about how to pull RABS codes.
G-Mann, yes, the truck was braked when got the hit. It was waiting for a green light. I'll check rear brakes wearing. My guess is this might not be the problem. I'll check.
Bill, thanks for your comment; I recognize that I am learning here, a lot.
Sjwoody, I have already checked the wiring and everything seems ok and normal. I'll change the brake fluid just to make sure.
Happy 2005 !!!!
Ken, I'll read about how to pull RABS codes.
G-Mann, yes, the truck was braked when got the hit. It was waiting for a green light. I'll check rear brakes wearing. My guess is this might not be the problem. I'll check.
Bill, thanks for your comment; I recognize that I am learning here, a lot.
Sjwoody, I have already checked the wiring and everything seems ok and normal. I'll change the brake fluid just to make sure.
Happy 2005 !!!!
Senior User
Joined: Nov 2003
Posts: 478
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From: ut
Just another 2 cents worth...
When I tried to flush my fluid, I couldn't get any out of the rear bleeders, even with someone pushing on the brake pedal. My conclusion was the RABS module was stuck, and I verified this by tearing it apart and seeing the rust.
I believe the VSS is just a magnetic pick-up type of sensor. It's probably fairly fragile. I don't know what they cost, but it may be worth throwing a part at it if the cost isn't prohibitive. Looking at the Haynes manual, it looks like an easy part to change. The impact of your collision may have damaged the sensor.
Hope this helps
When I tried to flush my fluid, I couldn't get any out of the rear bleeders, even with someone pushing on the brake pedal. My conclusion was the RABS module was stuck, and I verified this by tearing it apart and seeing the rust.
I believe the VSS is just a magnetic pick-up type of sensor. It's probably fairly fragile. I don't know what they cost, but it may be worth throwing a part at it if the cost isn't prohibitive. Looking at the Haynes manual, it looks like an easy part to change. The impact of your collision may have damaged the sensor.
Hope this helps
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New User
Joined: Dec 2004
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Thank You Sjwoody, I'll take your advice and let you all know how I finally fixed it.
It is going to take me some time to do this because I have to locate the parts first, make basic checks you and others have suggested.
Thank you again,
Ed.
It is going to take me some time to do this because I have to locate the parts first, make basic checks you and others have suggested.
Thank you again,
Ed.
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