Audi UR Q brake master cylinder options....???

[master6]

Video - Reverse Brake Bleed Method

Adam,

Have you ever tried reverse bleeding?

Some on the BMW Forums, do not like it, as they think it pushes the old dirty fluid back into the system.
And I agree, but if you have just changed to new fluid, it is okay to do.
Works for me!
Here is a YouTube Video of the reverse clutch bleed.
But this principle, will work on brake bleeding also.
Just start with the furthest wheel away from the M/C, and work forward.
on USA cars, RR, LR, RF, LF.

Link, Reverse Bleed

https://www.youtube.com/watch?v=wdf--suwqw0&t=45s

Best,

Jay

[chezz]

Is the Servo new... What vehicle is it from? Probably a totally irrelevant point, but the clutch slave is feeding off the same brake reservoir now? If this has not been bled off as well...

[newsh]

Sounds to me like the proportioning valve is bad.

[speedfr38ky]

Jay, thanks for the advice will give it a try as part of elimination process for sure.

[speedfr38ky]

[QUOTE=chezz;927648]Is the Servo new... What vehicle is it from? Probably a totally irrelevant point, but the clutch slave is feeding off the same brake reservoir now? If this has not been bled off

No mate they arent. Seperate.

[speedfr38ky]

Sounds to me like the proportioning valve is bad.

Mate, Its a new one way check valve that was bought off ebay. Could be this but will have to check

[newsh]

Mate, Its a new one way check valve that was bought off ebay. Could be this but will have to check

The symptoms are similar to what I remember when mine went, pedal goes down half way then feels wooden. Scary and unpredictable to drive.

[speedfr38ky]

The symptoms are similar to what I remember when mine went, pedal goes down half way then feels wooden. Scary and unpredictable to drive.

Its worth me having it changed that's for sure...thanks.