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      10-05-2012, 09:40 PM   #1
Qube
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Drives: E39 540 :: 09 STi
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Faint brake engagement when driving...

Trying to narrow down an issue...

Symptom:
- [assumption] occurs only driving over 50kph
- gentle brake engagement intermittently (every 5-10 seconds for 1-2 seconds)
- only occurs on throttle, not when coasting
- appears to happen quicker between engagements at higher speed (eg 100kph)
- not enough braking to stop but enough to feel and notice a very slight drop in revs/speed -- very, very slight
- seems like only passenger front by sound and lots more brake dust

Tried:
- caliper rebuild and disc refinish

There are no lights, no codes, nothing other than the faint grinding sound every so often. It's "on / off" grind/sanding sound without any apparent fade.

It APPEARS to have a pattern when driving at a constant speed on throttle (eg. 2 sec on, 4 sec off, repeat) but unquantified.

Car is a 2002 540i so it has DSC. Again, no lights are on or turn on when that happens. Also happens if DSC is turned off (just for the heck of it).

I want to try and see if the sound timing is exactly the same every time at a certain speed, but beyond that, I'm stumped.
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      10-08-2012, 07:08 PM   #2
cdmulders
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I just had my E39 ABS module fail - gracefully. My brakes did not pulse like yours, but on occasion the pedal feel was too hard, and it hissed. No lights, and no codes. Then it failed completely, and the dash lit up with trouble lights. So, even though you are not getting codes, it is possible that you are getting a module failure - slowly.
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      10-19-2012, 10:26 PM   #3
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Yea looks like DSC module going south.
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