1997 A4 Anti Lock Brake Issue

[radar13]

Hello,
I have a 1997 A4 2.8 with a 5 speed manual transmission. Vehicle has 137,000 miles. The anti lock sensors engage when I coast to a stop with the clutch in. This occurs at about 10-12 mph with moderate brake pressure. The car has new front rotors. I had a shop check it out and everything checks out with the exception that 1 ABS sensor is lodged and cannot be removed without tearing it apart. Could that sensor be the problem? I think it is rusted in. Any ideas?

[jak]

Never had this problem but from what I've read it is usually -
broken rotor ring
bad connection on sensor plug
sensor
They say a weak sensor thinks the wheel is locked
Has it had a read for codes although I'm sure sensor can be tested with multi-meter.
I'd be checking first 2 even though rotors are new
Hope this helps