I can't believe I am confused on the answers.
Either there are a lot of cars out there doing a so called test mode ???
or there are a lot of pre 90's with speed sensors bad.
If the unit is not working the ligh comes on the dash
If the speed sesors are bad the light won't come on because the unit
thinks the brakes are locking up. ( when there really not)
If there is a intermitent break in a wire you get abs at times with no set pattern of failure
Am I thinking correctly on this
Plus the only test short of going to a dealer is a resistance check to see if the sensor is bad????
I can't believe there is an intermintent break in the wire and it cuts out every time I back down my driveway in the morning?
but I can believe the sensor could be bad and the longer distance plus down hill cause it to act up.
I was never a parts changer without defining the cause of the problem but in this case I may have to change my way.
Again thanks for the help

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[B]Mike Y.
00 sl500 sport
88 560 sl (sold)