BrickBoard Archives
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ABS light / Front wheel bearing[740-760/90] posted by Roy-Magne Mo on
Sunday, 19 July 1998, at 11:07 a.m.
The Anti-lock light gets lit on my 760 a while after I start driving, before that ABS seems to work OK. Can a slight shiver in the front wheel bearing cause this?
And do anyone know if it is at all possible to tighten this wheel bearing - it's a 'once tighten - never adjust' type?
Re: ABS light / Front wheel bearing[740-760/90] posted by abe crombie on
Sunday, 19 July 1998, at 11:19 a.m.
If the light comes on as you gain speed through 3-5 MPH then you might have a faulty pump motor relay. The pump is tested as you gain speed the first time after starting car. If it comes on after you have driven a distance and hit a bump then a problem with wheel speed sensor wiring is likely.
The wheel bearing is a ball, not tapered, roller type that is not adjustable and must be replaced if it is loose.
Clean the connectors?[740-760/90] posted by johnb on
Monday, 20 July 1998, at 6:05 a.m.
There are at least two supposedly waterproof/gas tight connectors in the engine compartment, one on both sides for the front wheels and I haven't found the connector for the rear sensor (maybe it just reads off the speedo sensor in the rear diff...maybe I'll read the manual one of these days Anyway, my 90 740T got into the habit of doing the ABS light trick...until I got to it I would just put AT into neutral, kill and restart the engine (reboots the ABS computer).
I bled the system throughly, no change in ABS light problem (BTW, ABS won't work with the light on...reverts to std brakes).
Then I followed the sensor cables for front wheels through the wheel wells and into the engine bay to the first connector(s). Opened them up, sprayed with Wurth Contact OL (not a misspell...it really is OL onna can) which is some kind of oxidation solvent, and then touched the contacts with a very little dab of OxGard conductive sealant...some people like dielectric grease but I prefer the conductive stuff as long as I don't use too much and flood the entire connector and short the signal (bad karma, ABS light stays lit).
FWIW, the ABS light has stayed off for about 8 months so far.
Re: Clean the connectors?[740-760/90] posted by Steve Seekins on
Monday, 20 July 1998, at 9:26 a.m.
I would strongly recommend against the OxGuard inside a connector with more than one pin - too easy to get a short across the pins - the OxGuard seems to get runny and or separate with heat. I am unsure of the voltages in these sensors. If the voltage is less than 1v, just clean and do not use anything. Of the voltage is 5v or higher, use the dielectric grease.
Steve Seekins,