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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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?

Brett

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.

Dano
Tampa, Fl.

12 K1600 GTL
02 K1200 LT (gone but not forgotten)
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