Brake Servo Intermittent

[shakes]

E34 1993 525tds se

After a few seconds of braking, as I slow down to 2-3 mph I seem to lose all servo assistance.

Find myself pushing down on the brake pedal with all my weight just to bring the car to a stop.

Any ideas?

Cheers

[Guest Mister Dabsy]

Air leak !! Master cylinder seal failure !!

One or both ;)

Cheap to fix B)

[shakes]

Cheers nutter. New master cylinder seal it is then. Any suggestions where or how I check for an air leak. Loose brake unions?

Maybe it's better to start with new master cylinder seal.

[Guest Mister Dabsy]

If the break pedal becomes very hard but does not go to the floor, then your fluid would seem to be ok...

If this is your symptom then firstly check the hoses to the servo, I mean check for cracked or perished hoses and maybe pull it off to see if its blocked (blow through it).. An temp fix would be to wrap "Duct tape" around the hose until you replace it.

[shakes]

Ok I'll check the hoses, 'cos pedal does stay firm. Noticed that hoses look recently changed so will blow thru them to check. Thanks Dabsy

[shakes]

Looks like it may be vacuum brake pump located on the end of the camshaft.

Found only because I sprung a sudden engine oil leak. Local mechanic diagnosed the vacuum pump as the culprit of both different symptoms.

BMW dealer wanted £240 to order the pump from Germany.

Fleabay can courier one from a "broken" car in two working days for £29.

Here's hoping this resolves brakes and oil leak

[G4VHD]

Looks like it may be vacuum brake pump located on the end of the camshaft.

Found only because I sprung a sudden engine oil leak. Local mechanic diagnosed the vacuum pump as the culprit of both different symptoms.

BMW dealer wanted £240 to order the pump from Germany.

Fleabay can courier one from a "broken" car in two working days for £29.

Here's hoping this resolves brakes and oil leak

Nice 1, keep us posted mate

[Guest Mister Dabsy]

Excellent result matey...