ABS Noise - RR Engine

Groundhog · 25-08-19, 04:00 PM

Here’s my four pennies worth. In my many many years of working on Quattro’s most ABS faults could be fixed by resetting the sensors. Your fault is screaming air gap problem. In my opinion ( and following Audi’s advice) new sensor caps should be used each and every time a linked component is disturbed. The way I did it was to put a new cap on the sensor push it in till it touched the rotor, spin the wheel half(ish) a turn and while still keeping pressure on the sensor nip the bolt up. 99 times out of a hundred this works every time. If new caps are unavailable or you want a quicker fix then it is possible to measure the individual frequencies of the senders and adjust accordingly. There are different methods to do this and it largely depends on what equipment you have access to, if you google ‘ testing a ABS sender’ the different ways can be found and explained better than I can here, a multimeter is a minimal requirement though. I have very occasionally come across broken wires, particularly where they are clamped to body work but this would show very readily using test equipment.

25-08-19, 04:00 PM	#6
Groundhog Grown up member Join Date: Nov 2009 Posts: 143	Here’s my four pennies worth. In my many many years of working on Quattro’s most ABS faults could be fixed by resetting the sensors. Your fault is screaming air gap problem. In my opinion ( and following Audi’s advice) new sensor caps should be used each and every time a linked component is disturbed. The way I did it was to put a new cap on the sensor push it in till it touched the rotor, spin the wheel half(ish) a turn and while still keeping pressure on the sensor nip the bolt up. 99 times out of a hundred this works every time. If new caps are unavailable or you want a quicker fix then it is possible to measure the individual frequencies of the senders and adjust accordingly. There are different methods to do this and it largely depends on what equipment you have access to, if you google ‘ testing a ABS sender’ the different ways can be found and explained better than I can here, a multimeter is a minimal requirement though. I have very occasionally come across broken wires, particularly where they are clamped to body work but this would show very readily using test equipment.