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Re: Question about Scenic 2005 (54 Plate) brakes
Of all the hundreds of sets of pads I've changed I've only ever had one problem with a master cylinder,and that was on a Mk3 Astra and they were notorious for giving master cylinder problems even if the wind changed direction.
The pedal sinking after a pad change is usually down to the pads not being in full contact with the discs,once the car has been driven a few miles the pedal will return to it's usual operation.If the discs were new as well then that is a different matter,a seized caliper slider would cause a similar problem.
The thing that many people don't do is check the pedal feel BEFORE they change the pads,some pedals can feel odd when the car is stationary and the engine running,once the car is driven they will usually feel OK.It's always best to try the pedal before you work on the brakes,you can then tell if there is a problem after you've changed a component or whether the problem was there to start with.Some pedals (especially modern diesels) will gradually sink to just above the floor under slight pressure with the car stationary and the engine running,this is a particular characteristic of some vans I get to work on too.Once the vehicle is driven then the brakes feel fine again though.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo