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The vacuum is held in by a one way valve at the master cylinder. they occasionally leak air the wrong way which doesnt matter when engine is running. when mine leaked it did so immediately when engine stopped running. i could hear the hum as the vacuum sucked air through the solenoid valve for EGR a...

Hi I have a 2002 90 HDI. The speedo stopped working recently but has returned albeit erratically. At rest it will move when the car is revved. This has caused it to fail its NCT(Irish MOT). My mechanic thinks its the sender and has ordered one but is this likely if revving the car in neutral affects...

While trying to diagnose a weird braking fault I have I think I've made my 406 lose power. Sound like turbo loss from reading other posts. I was checking vac circuit which included the two solenoids EGR and turbo valve I believe. I also changed the air filter as it wasnt done in a while. Way I see i...

It works perfect 99% of the time so most components must be ok. Does you know if there is an electrical component to the power assist. Up until now I thought it was purely mechanical at that end i.e. a mechanical valve switched by the brake pedal which switched vacuum(which is supplied by a shaft dr...

Hi I have just joined the forum. I have a 2002 406 90 Hdi rapier model. On three occasions over the past year the servo has failed to kick in during braking. The brake pedal felt the same as if engine was switched off - rock hard. Had a local Peugeot garage look at it but they found nothing unusual....