Wheeltrax

Many thanks for your relies. PROBLEM IS SOLVED! With the information you gave I did a little investigating (see above) and was able to tell the Citroen garage exactly what was happening. Unfortunately I couldnt pin point the source of the problem myself but the garage did get to the bottom of it. Lee, you're right on the money with the return valve that screws into the vacuum pump! A ten pounds part and as easy as it gets to replace. Just happy to have consistent brakes back! Cheers guys ;)

Lee you're a star! I had a good look over the system before I did anything; from pump to hose to servo. Next (as per a tip I found elsewhere) I pumped the brakes with the engine off to expel any vacuum and with foot still on the pedal started the engine. Hmmm, pedal still rock solid. Not good - should go slowly down if the vacuum starts drawing right? With the engine still running I popped the hose connector off the servo and.... no draw. Turned engine off (hose still uncoupled) and had another good look around and another head scratch. What happened next I cant explain. With the hose uncoupled I fired the engine up and....the hose is now drawing air. Weird! Popped the hose back on and the brakes work perfectly. The next step is to see what happens after the car has been sat all night. Mornings are normally the worst. :UPDATE: Tried the car this morning and we're back to square one! Damn!!! The car is a 2005 2.0D. The pump, hose servo all look in tip top condition with no obvious signs of damage or wear. Why should I have intermittent vacuum?

Im fairly new to Citroens and although normally OK on anything mechanical Im totally stumpted with a brake problem. Can any of you good people out there help me? The brake pedal feels absolutely wooden first thing in the morning or if the car has sat for a few hours. Braking power is there but it needs all the strength of my right leg to haul the speed down! A servo issue? The local Citroen dealer has bled the system twice so I (think) I can rule that out. Air in the system would cause sponginess anyway right? So it cant be that. Could it be a vacuum leak somewhere? The engine is also lacking power (in a big way) from time to time but both the brake and engine probs seem to sort themselves out after 5 - 10 mins of driving only to come back again when the car has been stood. GAAAAAAAAAAARGH! Somebody p l e a s e tell me they have the answer!