Guys, when I approached the forum on my ABS failure, the responses (ABS module, sensors, damaged tooth cam) were all tested and found to be ok, or not to be responsible. The problem however, remained. Only last week did the computer identify a hydraulic pump failure as a possible new cause. Tested ...

Thanks for all suggestions. Prime suspicion was on ABS sensors and cabling. Guess what: ABS sensors clean, electrical output measured, logged and OK, cabling in good condition, ABS module extremely unlikely to be culprit, as identical phenomena after replacement. Have now disconnected ABS cable ...

To confuse you guys even further: when I touch the brakes lightly or hard, I get the abovementioned noise. However, often when I apply the brakes lightly at first, release, and brake again, the brakes operate normally, no racket, no squeal.

When all this started I thought about loose bearings ...

When you enter the subject in the search function of this forum, you count hundreds of entries. Just about all seem to go back to dodgy ABS modules or faulty sensors. Generally there is mention of the ABS and/or TRACS lights coming, or no mention of these lights.

I experience the same whirring ...

Have decided to write off driving substantial distance without problem as a fluke, since it now occurs 30-40% of every brake action. As I will work on the car again next week, I will concentrate on user experiences with this phenomenon WITHOUT the ABS/TRACS lights coming on.

Using the search "ABS ...

Sofar the ABS and Tracs warning lights have only come on once. Drove to the nearest motorway stop, switched off, started and warning lights gone......The rattling sound has on dozens of times by now.

A run with the car with a laptop with diagnostig software plugged in did also not give any pointers ...

My V70 AWD with 300 k on the odo sometimes gives a slight whirring sound while driving. As it says in the song, this means "there's trouble ahead": when applying the brakes I get a loud sound and vibration around the front wheel which I associate with a ball bearing with a broken ball, or stopping a ...