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ABS fault

Help,

My ABS light just has come on (and typical its only a week to MOT)  The Car
is a 93 L Audi Coupe 16 V.

If I switch on the ignition the light comes on and then after a couple of
seconds goes out,  there is then a relay click and the light comes on and
stays on.   If I switch on the ignition and start the engine with the brake
pedal depressed the light (after its initial ignition test) does not come on
untill I release the pedal.  I have read some where that when the engine is
started the pedal should drop slightly.  It does not.

I have checked the ABS fuse which is OK.  I have still to have a look at the
sensors and wires.

I have changed the rear discs and pads recently (two weeks ago of daily use)
but the ABS was fine.

Any advice would be greatly appreciated

Thanks
Adrian