ABS Problem

'89 Coupe - Passes ABS 4pmh test. No antilock activity during extreme braking & rears will lock. Brake & Gauge fuses are good. All wiring is intact. Master cylinder & all calipers replaced, system flushed & new Super Blue fluid. Front brake ducts & s/s pistons in calipers too. :banghead: Any suggestions or experiences are greatly appreciated.

look into proper opeation of abs relays in master cylinder

I have the same problem
my light is on all the time

then i had a brake caliper lock up

goes away after i shut it off

need to change the relay and will see if that fixes it