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Originally Posted by ewebby
Thanks
I understand the sensor part. I figured the 2-celled master cyl resevor would indicate by having less brake fluid, which axle needs the pads.
Maybe there is not a seperate fluid resivor for each axle?
My dealer said they did the rears under warrenty about 3 months ago, I looked at them and they look thin, but that was before I bought fronts.
Fun fun
Kevin
Phoenix
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the bmw only uses a single master and slave cylinder for the entire brake system. the fluid has nothing to do with pad wear. the level is the same even if the pad is as thick as new or as worn down as bare metal plates. the pistons in the calipers only move as necessary so the fluid cannot be used as an indication for pad wear.
if there were two resevoirs for front and rear brakes, a much more sophisticated brake bias system. some race cars have a limited adjustment they can use for brake bias and that requires seperate master cylinders for each front and rear system. however, the fluid still does not indicate pad thickness/wear amount for the same reason above.
hope that makes sense...