OK, there's a pump always running on the P38, i had a slow leak that sorted the air pump out. The ABS pump is fine.
It seems to be coming from the ABS modulator block? Is there another pump in there?
I can't remember my last one doing that?
mine does the same Nige, nothing in that department has broken since i bought it six months ago. Is it the noise that sounds when you turn the ignition on? A mate of mind has an auto diesel P38 and his is the same I'm not on the laptop at the mo, but when I am i'll look at the RR manual and remind myself of the little pump thats in there
I wouldnt worry
DAve
I just want to know what it is!
Look at the official manual it states that there is a:-
Brake booster / ABS modulator unit (contains hydraulic pump) and, an abs power unit, with a pump in each (contains power valve)
Dave
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