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Old 01-09-2018, 07:57 PM   #7
Gunkk
Thank you Al Oppenheiser!
 
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Drives: Red Hot A10 ZL1 Convertible
Join Date: Jun 2017
Location: Sarasota, FL
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Any system that can reduce pressure between the pedal and the pad can fail “open” resulting in reduced braking.

Googling “gm abs brakes fail” showed me three links with behavior sim8lar to the OP: vibration at low speed and no stopping. Basically the ABS activates on its own when it shouldn’t, and the car (or truck in that case) won’t stop.
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