Help With Brakes

[bilko0795]

Changed the pads on the rear brakes on the wife's S3 on the w/end and one of the pistons was seized changed the seals and new piston and tried bleeding the brakes no joy

The brake pedal is going so far then it clunks and goes to the floor I'm wondering if its the master cylinder that's gone can someone confirm if this is the case please.

[rynaqui]

If the pedal is going to the floor then you must have a leak somewhere..were the brakes fine before?

[mike74]

...Or there's still heaps of air in the caliper. Are you bleeding them manually or with a pressure bleeder?

[rynaqui]

...Or there's still heaps of air in the caliper. Are you bleeding them manually or with a pressure bleeder?

Or this..if it is making a clunking sound towards the end of the pedal travel then you still have air in the system, it really is a two man job unless you use an ezeebleed.

[Monkeymagic]

There will be air in the system bleed the master cylinder first. Mk4 platform cars are sometimes a real cow to bleed a nd you sometimes need to use vcds to activate abs vales and bleed in sequence.

[S2 EDS]

I'd say air in the system Ray - and yes re-bleed in sequence - caliper furthest away from master cylinder first.

[bilko0795]

Thanks for all the replies it seems that you have to bleed the master cylinder as monkey magic says, as the system on these cars need only 15 psi as any more and you can damage the seals inside the master cylinder I used both methods ezi- bleed and then the old way I think my sons got a real heavy foot S2 EDS will know what I mean . I will bleed the master next if still no joy then I will fit new seals.