Brake bleeding

[sloss]

I've renewed my rear caliper seals, discs and pads and the handbrake adjusted up fine and I gravity bled the calipers - Girling Lucas as fitted to a 4.2 Quattro 02 vintage.

I have good enough brakes and the ABS works but if I hold the pedal down it eventually goes to the floor - engine on or off.

There is no loss of fluid. The car has ESP but there is no connection under the ashtray which I expected to find according to my Elsa Database?

To me this would appear to be a Master Cylinder problem but why now as I did not force any fluid back up the system as I would the pistons in on the bench.

However the O/S hose clamp leaked overnight and it lost a lot of fluid.

Any ideas?

[Ska]

If your looking for the interface socket for the diagnostic tool it is proly under the dash near the steering wheel IIRC.

[sloss]

Hi Ska,

I can connect to that one but according to the bumph I read the system needs to be connected through another connection under the ashtray... there is a 'hole' there but no connector.

Seemingly it's to run the pump to purge it!

Looks like a trip to the Independent Specialist - a little humble pie I think after telling him I'd do the brakes myself!!

It's only money....

[Duffy3074]

When I had my last fluid change done (I do it yearly on these things) my local independant (Whom I rate) said that gravity bleeding alone, or even pressure bleeding at too low a pressure would lead to exactly this problem on an A8/S8.

I use an eazibleed with the pressure turned up and it worked very well.

[sloss]

Thanks for that, I'll get myself an 'eazibleed' and change the fluid while I'm at it.

Watch this space....