Audi coupe 1990 20v coupe abs problem

[Fred no]

HI i have a problem with my 20v coupe quattro most of the times when i apply 
the brakes the antilock engages while wheels are still truning... This 
results as less braking or no braking at all sometimes... this is very scary 
pumping the brakes sometimes you can find a hole where you can go tru the 
abs and actually brake. No wheels lock when this happens (while pushing like 
a maniac) sometimes slow sometimes fast.Pretty scary went thru a stop today 
on asphalt...  dint want to brake..
Anyone that had similar problem or could help me out?The bently has almost 
no information on this subject only how to use the bosh abs tester witout it 
theres nothing useful to help me test anything. The only thing i can do 
right now is maybe visually check the teeth on the cv joints... and the 
connections.

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