S40 (New) Brakes : My S40 is braking my brain!

[glegalee]

Today the rain held off and I was able to get back out and work on the car. I spoke to one of the neighbours who supposedly used to be a mechanic, he suggested that the entire brake system needed to be bled and that it should be done in a specific sequence. His suggested sequence differed to that in the Haynes manual.

Anyway I enlisted the wife as my assistant again and we set about bleeding the entire system. The neighbour was adamant that bleeding the brakes would fix the sinking pedal issue.

Needless to say that it did not.

I've also been looking in to the idea that the BCM (Brake Control Module) is faulty as when I scan the car with my DIAG system I get an error code...

ECM-C121 - Communication, Brake control modules. Signal missing

I've been looking at my Volvo electrical schematic and have found that the BCM is on the same CAN circuit connections as my bad EPS pump was on which suffered from water (windscreen washer fluid) ingress onto the internal circuit board. I'm wondering if the BCM is indeed faulty and is therefore not functioning correctly and is allowing the brake fluid to pass internally and the noticeable symptom is the slow sinking of the brake pedal when pressed.

The Haynes manual suggests that replacing the BCM is a difficulty level 3 job and should not be overly difficult to carry out. Seemingly the hardest part is getting to the unit as it is bury'd behind the battery tray and plastic covers on the firewall.

Any ideas how the BCM and ABS pump works in this vehicle?

Cheers G.