Thread: Vacuum pump symptoms

Hi all, my 300tdi has developed a rattle and I suspect it is the vacuum pump. I have checked the tappets - all good.
On start up (at idle), there is usually no vacuum until I give the motor a rev, then it is only good for 1 sometimes two quick pumps of the pedal before running out of vacuum and there is rattle that sounds like a tappet or diesel knock which is present about 90-95% of the time. These is also some oil leaking from the vicinity of the vacuum pump.

Is this a typical type of behaviour for a failing vacuum pump?.


Thanks,
Tom.

Originally Posted by Roverlord off road spares

Tom , make sure the booster hasn't got oil in it or the hose when you replace it.Suppliers won't warrant a new one if there is oil in the system. Some even request the vacuum booster also be replaced.
Cheers, Mario

Booster is about a year old (and I still have the old one which is likely serviceable). So I doubt it has oil in it. Whole brake system replaced - Master Cylinder, Caliper Pistons and seals, brake hoses and proportioning valve. But I will check. I already intend to take the pipe off and check it for wear etc.


Cheers,
Tom.