ANTI LOCK LIGHT "ON"

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Author Message   Al A Dolandolan (Ald2x_98) Posted on Monday, May 20, 2002 - 04:04 pm:    Hey guys, I was driving to work this morning when my Anti Lock light came on. When I stopped, I tried re-starting but the light is still on. has anybody experienced this before?   Blue (Bluegill) Posted on Monday, May 20, 2002 - 04:28 pm:    as you probably know, the light comes on when you start ignition, then should go off after a you travel a hundred feet or so. Occasionally my ABS light stays on for many miles, then shuts off. Don't know why - sensor(s) going bad maybe? ABS works fine, though....   niall forbes (Forbesn) Posted on Monday, May 20, 2002 - 05:16 pm:    I've been told that often when the ABS light comes on it means a wheel bearing is on the way out.   alyssa Posted on Monday, May 20, 2002 - 06:01 pm:    The ABS light stays on until you hit 5mph, not once you have travelled a certain distance.   Blue (Bluegill) Posted on Monday, May 20, 2002 - 06:25 pm:    that makes sense: zero to 5 mph in 100 feet!   Cooper Posted on Monday, May 20, 2002 - 06:33 pm:    what if your ABS activates during normal driving conditions while braking. What causes this?   Axel Haakonsen (Axel) Posted on Monday, May 20, 2002 - 07:25 pm:    "I've been told that often when the ABS light comes on it means a wheel bearing is on the way out. " I don't see the relation. If the ABS light stays on, it just means that the ABS computer was not able to initialize itself, because it did not get a good signal from all the sensors once you hit 5mph. That's caused by either a bad, dirty or loose sensor, a short or a broken wire. Bad, dirty or loose sensor is the most likely culprit.   Chuckster Posted on Monday, May 20, 2002 - 07:34 pm:    Mine's been on since I bought the truck, but my brakes are fine. Question is, how do I know which sensor and how much do they cost?? Ride On, Chuckster   jay martin Posted on Monday, May 20, 2002 - 08:19 pm:    Ok Mine ('95 Disco) started this weekend. When it's happened before it was after changing the tire and a sensor popped off. Now it's not going off, then it goes off after 5-10 miles. Then it goes off the next time you start it. Then it stays on for a few miles etc. etc. Totally random, but mostly on rather than off. Any thoughts? I recently changed a tire but that was a few hundred miles ago.   ken knebusch (Charlotterover) Posted on Tuesday, May 21, 2002 - 10:07 am:    Yeah Chuck, My '96 has been on for the past 3years. No problems.....yet!   Paul T. Schram (Paulschram) Posted on Tuesday, May 21, 2002 - 10:18 am:    It is unlikely a wheel bearing would cause the ABS system to malfunction as the ABS components are inside the swivel housing and completely free of any influence by the wheel bearings. The shafts upon which the rotating ABS components ride are supported by the differential and the stub shaft bearings. If the wheel bearings were so badly worn that the drive flange was wobbling about so badly as to cause alignment issues inside the swivel ball, I strongly suspect that the driver would have been aware of impending disaster long before the ABS light alerted him or her to the condition. I recently rebuilt the entire front end on my brother in law's rangie where the CV joint (where the speed sensor ring is located) had been ground down by the cage and bearings flopping about. Even though the teeth on the speed sensor gear had been cut down to a fraction of their original profile, he never had any indication from the ABS system that anything was amiss. That said, there any of a number of things that can cause malfunctions of the ABS system. I personally would invcestigate the potential of an electrical problem as this could be a harbinger of a failing alternator which can take much circuitry with it when it fails. Depending upon which year this vehicle is, one might be able to flash-read the codes to determine if something is out of alignment. If unable to flash the codes (like me), it indicates an inability to communicate with the brake ECU, which is apparently a common failure mode for this component. The good news is that there are many of us who run these trucks everyday, long distances and at elevated speeds with no apparent diminution of braking ability or safety. Paul   Brad Posted on Tuesday, May 21, 2002 - 01:16 pm:    I have been dealing with my light for over a year and have realized if it comes on and goes off randomly the sensor is loose,when ever I push the sensors down in the front the light doesn't come on for another day or two   justin Posted on Thursday, June 13, 2002 - 04:51 pm:    This might be a rather old thread but just out of curiousity where would one find the ABS sensor to check.... thanks, justin   Anonymous Posted on Saturday, June 22, 2002 - 11:01 am:    check the ABS relay.....   John Averett Posted on Saturday, June 22, 2002 - 01:24 pm:    Has anyone disconnected there abs system totally? I mean get rid of the relay and everything on a D1. Does it have any effect other than non abs? Will it trip the "check engine light", can you tell me what is involved in disconnecting the system? Thanks, John   Roger Fastring Posted on Saturday, June 22, 2002 - 01:28 pm:    Dunno exactly, but on my brothers old Lincoln, there was an ABS fuse in the fuse panel. When his abs system was too expensive to fix, he just pulled the fuse and other then the abs light staying on, it just operates as non-abs.   Paul T. Schram (Paulschram) Posted on Saturday, June 22, 2002 - 01:33 pm:    Justin: ABS sensors are found at each wheel. Remove tire and look for a convoluted wire running to a device that looks like a small thimble sticking up. If you wish to flash the codes, the connector is beneatht he dash on the drivers side, a blue connector with five contacts. I believe you jumper the black and purple wires and read the flashes of the light. John: I know of several who have either done it, or who are collecting the parts to completely remove the ABS from their trucks. One of them is even replacing his calipers with aftermarket high performance models. I have read several accounts of folks merely pulling one of the fuses or relays to disable their ABS system. mine has not been operable for the past 15 months and 44K miles. Paul   petern12 Posted on Wednesday, July 31, 2002 - 03:22 am:    My Anti-Lock light has been on 90% of the time. The scary thing though, is the ABS systems is now way too sensitive, I mean it would activate itself even though I'm just braking in the most mundane fashion from 35mph at a red light on dry pavement. I can hear the ABS cycling itself furiously and vibrating back at the brake pedal almost violently. The result of course is a much longer braking distance, downright scary in tight traffic. I heard of dirty brake sensors can be the culprit. If so, how do you "clean" brake sensors? The only other thing I could think of that possibly causing my problem is that the previous owner did replace one of the four bald tires with a brand new one (same brand & size). Could the larger diameter of the new tire causes confusion for the ABS system, thinking that the vehicle is slipping as it is braking? Help!   brad Posted on Wednesday, July 31, 2002 - 11:05 pm:    If you take the sensor out of the axle grease will leek out of it.   muskyman Posted on Thursday, August 01, 2002 - 09:07 am:    "I've been told that often when the ABS light comes on it means a wheel bearing is on the way out. " I don't see the relation. If the ABS light stays on, it just means that the ABS computer was not able to initialize itself, because it did not get a good signal from all the sensors once you hit 5mph. That's caused by either a bad, dirty or loose sensor, a short or a broken wire. Bad, dirty or loose sensor is the most likely culprit. axel, believe it or not on many vehicles (GM TRUCKS) the shop manuals do tell you to check the wheel bearings and seals when a false or constant ABS light goes on. you where right on track,its due to the contamination . turns out the bearing grease causes the high metalic brake dust to cause the sensors to malfuntion not allowing the ABSCPU to initialize. I have no idea if this happens with disco's but it must be enough of a problem in some to make list on the check this trouble shooting guide for a suburbans.   Robert Sublett (Rubisco98) Posted on Thursday, August 01, 2002 - 09:43 am:    My ABS light burned out, ABS works fine(last time I had to check it out when an 18 wheeler came over on me coming through the mountains) Did have the problem of the ABS kicking in when it shouldn't be when I first got the rig. Pulled the sensors, cleaned them up a bit and knocked them back in place. No problemos now..   Buddy Posted on Thursday, August 01, 2002 - 01:37 pm:    When you pull out the sensors to clean them, do you have to replace the bush? The shop manual says you have to replace them for whatever reason they get pulled out.