e39 m5 brake pedal pulsing

[oltarmac]

hi,
ive been having an annoying re occuring problem that i thought i had finally solved. left hand speed sensor front. so after replacing the abs sensor twice,my mechanic discovered that underneath the oil filter housing the wires had "chaffed" through,this was due to the oil filter housing being snapped off its brackets.
so tonight i collect the m5 and straight away when i brake the pedal is pulsing up and down,but no lights.so i ignore the problem..then on the motorway i give it a bootfull,bang, on come the lights.
the lights are now back out again but the pedal is pulseing.
any ideas??

[neiljohnson]

oltarmac said:

hi,
ive been having an annoying re occuring problem that i thought i had finally solved. left hand speed sensor front. so after replacing the abs sensor twice,my mechanic discovered that underneath the oil filter housing the wires had "chaffed" through,this was due to the oil filter housing being snapped off its brackets.
so tonight i collect the m5 and straight away when i brake the pedal is pulsing up and down,but no lights.so i ignore the problem..then on the motorway i give it a bootfull,bang, on come the lights.
the lights are now back out again but the pedal is pulseing.
any ideas??

Have you had the run out checked on the rear discs?? if 1 has a bad warp it will upset the dsc & ABS although it would have to be very bad. I have seen rear discs crack on the 5 seris but never an M5 but may be something else to look for. I doubt its a front problem as i would expect you to get it threw the steering as well.

[oltarmac]

Its going back on the scanner tommorow,
i will let you know.

[road_rager]

You will need to replace/re-skim your discs.... You can find out which disc is warped by jacking the car up and spinning the wheels by hand, you will be able to hear the uneven spinning of pad-to-disc contact on the offending wheel...