I had the anti skid service indicator come on once, but put it down to just having the discs and pads changed.
I then had my XC90 in to Volvo last week for a free safety check and i obtained a print out of the fault codes on my vehicle.
These were the following codes in respect of the brakes:
BCM-0050 Control module Faulty signal - DTC is found active.
BCM-0121 Yaw rate sensor Signal outside its permitted range - DTC is found active.
BCM-0139 Pre-pressure valve power brake booster Signal outside its permitted range DTC is found active.
After having the codes reset i took the car back to volvo one week later, after having the anti-skid service required appear again once. Only the yaw sensor code (BCM-0121 Yaw rate sensor Signal outside its permitted range - DTC is found active was present).
I had the 4 wheels aligned (£99) and the brakes control module calibrated on VIDA (free).
This removed the remaining brake code, however, i suspect that only time will tell if the problem comes back.
When i saw the original codes I was convinced that i needed a new brake control module, but now, after only minimal work, i suspect that it is actually alright. Sometimes simple fixes work, although i will probably eat my words knowing my luck!
My warning was intermittent, and from my time researching this fault my advice would be get the codes read, take advantage of Volvos free check offer.
It could be the brake control module, but you can get this repaired for £100+ VAT (BBA Reman) and there are lots of posts about this.
It could be the yaw sensor, again this could be repaired for £100+VAT, or a new one is around £350.
It could be a few other issues but you might be lucky and just need the brake module recalibrating like me.
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