Brake Hydralics - HELP!!!

[924Guy]

Yikes... sucks/wierd that you'd have to have the ign on to bleed - all our Bosch systems (at least for sure 5.X-onward) are all flow-through - can bleed with ignition off.

If you pull the rear lines off after the ABS unit and see about blowing air through there, you should be safe and also isolate any issues that might occur with the ABS unit; it should be safe against sticking, but hey, who knows...

[benspeed]

Must have said something wrong - don't need the ignition on to bleed although I tried both off and on. Didn't make a difference.

Thanks Vaughan - will let you know how this turns out - likely will post more info for help!

[pfcs]

Ben-if it's the late German syndrome, you need to force the fluid thru with the hi pressure type bleeder, not pump it thru w/pedal. If it's this case, you will not be able to get a decent peadal no matter how long you pump the pedal! phil

[Spinnetti]

Ah, I forgot about ABS... Used to my old cars Yep, there's a special procedure for that, and IIRC, it does require a pressure bleeder (I don't have it handy, but have it somewhere on my Audi service DVD somewhere)

[benspeed]

OK - here's and update. I was able to isolate the blockage down to the abs pump. Fluid will not come through to the rear line. I checked EVERY line and the calipers with compressed air. Made sure to disconnect the ABS first.

Sure learned more about brake hydraulics than I knew before.

Looks like a new ABS pump will solve this problem.

[benspeed]

ABS pump fixed the problem - car is running sweet.