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Re: ABS Electrical Puzzles
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Mon, 28 Aug 2006 09:31:37 Share Post by Email
In Reply to: ABS Electrical Puzzles, mike900s [Profile/Gallery] , Sat, 26 Aug 2006 11:10:55
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First - the Brake Fluid Light being stuck on.
I'd have to check my Bentley, but I'm pretty sure there is a switch stuck in the back of the Master Cylinder called the Brake Warning Switch. If the pedal goes down too far, it trips the switch and turns the Brake Fluid light on. The idea is that if the pedal went that far, something is wrong with the brakes. My guess is that during the brake bleeding, you pressed the pedal down a ways and tripped the switch.

I doubt that it is a pressure switch.

Of course, the question is how to reset the switch? That's where I'd get my hands on the Bentley. I've found the switch on schematics, but I'm not sure I could point it out without documentation.

ABS light. The ABS bulb is turned on by grounding the wire at the ABS relay. SO yes, you need +12 somewhere. All of the bulbs in the Instrument cluster - ABS, Brake Fluid, Parking brake, low fuel, and power for the Coolant and Fuel gauges get their power from the same power bus, and the same pin. So if the Brake Fluid and Parking brake lights work (and we KNOW the Brake Fluid light is working overtime), then +12 is getting to the bulb. So at this point, possibilities would be a bad ABS bulb, or the bulb isn't making good connection. You should be able to swap the Brake Fluid and ABS bulbs, and see if the bulb at least is good.



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