Arming ABS while backing up? - BMW Luxury Touring Community
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post #1 of 5 Old Dec 1st, 2005, 11:24 am Thread Starter
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Location: Allen, TX, USA
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Question Arming ABS while backing up?

OK brake experts, I have a question. Do you believe that there are any adverse effects that might result from arming the ABS while riding backwards? I know... what a stupid question ... and who would be dumb enough to do this? Well, I do. My garage is several feet above the alley behind the house. I regularly coast down the driveway backwards with slope assist fast enough (>-4 MPH??) that the ABS light goes out, signifying that the system is calibrated and ready for use ( right?). I haven't experienced any braking problems so far, but I am beginning to wonder if this practice might be screwing up the calibration process. I guess the answer would depend on whether the wheel speed compare circuit can tell which direction the wheel is spinning, which seems a little more sophisticated than the functionality of the system would require. Is my thinking correct or should I slow down backing out of the garage to the alley?


Get busy livin' or get busy dyin'!

2003 BMW K1200LTC "El Gato Grande"
1993 Suzuki GSXR1100W
1978 Suzuki GS1000C 'Project'
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post #2 of 5 Old Dec 1st, 2005, 11:28 am
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I doubt you are causing any problem. I would think the brake module
is simply looking for pulses to verify the sensors are both working.

Larry Rusnak
Wadsworth, Ohio
2002 K1200LTC Pacific Blue
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post #3 of 5 Old Dec 1st, 2005, 1:21 pm
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The ABS wheel speed sensors cannot sense direction, so as long as they are moving at the required speed, the system will self-check okay.
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post #4 of 5 Old Dec 1st, 2005, 6:34 pm
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Shouldn't matter. The sensors detect wheel movement of the idividual wheels, does some math, both wheels moving at about the same speed with the brakes off, everything is OK, go for a ride.
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post #5 of 5 Old Dec 1st, 2005, 9:47 pm
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I always back down out of my garage

My driveway sloped down from my garage and in 2 years and 18,000 miles, it still stops quickly when I use the brakes.

Tampa, Fl.

12 K1600 GTL
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