Whirring Noise - Saab 95

[blueboy2001]

Colleague of mine has an S reg Saab 95 2.3t Auto. About 3 months ago the turbo went and was replaced, and since then he has complained of a constant whirring noise proportional to road speed. It doesn't get worse under power, if you put the transmission in neutral the noise remains the same and it doesn't do it if the engine is revved in neutral.

He's had it at the Saab dealers who so far have replaced the tyres for the OE Continental's and one of the wheel bearings which has made no difference at all.

I've been out in it today and I'm pretty certain its not engine noise, it is more like something along the drivetrain. The CV joints aren't noisy during low speed maneouvers. I have noticed that under braking the noise changes, and under harsh braking it all but disappears.

Any ideas?

 

[blueboy2001]

It does indeed look like the brakes are the problem. I have since found out when it went in for the turbo it was also serviced and the front pads were changed. The discs have got a fairly substantial lip worn into them and it seems the new pads catching the lip is causing the strange noise. Tinpot garage who did the work should really have changed the discs.