thanks for the quick reply, I feel it is pressure switch as well but want reassurance before taking things apart again. I hate getting greasy and oily in the dark and wet....

Hi All, I will post in the introduce yourself thread as well shortly. But first 1998 P38 Diesel (bmw engine) lhd. The brakes failed. Symptoms are no brakes...... the emergency or secondary brake circuit works on the front wheels. The relay to run the pump is good, opened, cleaned, checked, all...