R55 warning light
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Join Date: Feb 2014
Location: SF Bay Area/Monterey, CA
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I had the same thing, now all's fine
On a long road trip about 2 weeks ago I hit a series of hard bumps and potholes which really bounced my 2010 MCS hard. After the last (and worst) bump my red "BRAKE" warning light came on in the speedometer. I checked many things, brake fluid, apparent wear on the pads, considered replacing speed sensors, etc. So, the cause ended up being the rear brake wear sensor, which was brand new and which I had tied off with wire ties when I replaced my rear pads a few months ago. The hard bumps had somehow set up enough momentum so somehow the sensor must have come loose or contacted the wheel or tire and it had been torn loose and disappeared. I had to use the turn signal stalk to reset the rear brake maintenance indicator in the computer. Needless to say, I actually installed the new sensor this time rather than tie it off. I thought I had secured it very well the previous time but it must have gradually slid rearward enough to contact something. Or, perhaps something I ran over (twig, who knows?) might have snagged the sensor wire and yanked it.
Last edited by michi1201; 05-30-2015 at 05:09 PM. Reason: typos
#5
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