Audi CQ20V ABS problem

[shorty_94]

No, you can't even connect with the "old" ABS-ECU. It doesn't support this!

[Tom_]

Ok, thanks for info...What about teeth? Can u confirmed your 45 ? Thank you Shorty

[Val]

vs 96 or 97 teeth (haven't counted them recently). Picture is 9 years old.
Ring can be taken off, but you can see the difference.

[Tom_]

I see only bottom picture. But i think, that 97 teeth are from older audi than a CQ 20V 7a.


Thats the old ones, but i havent they yet :/ :/

and this is the new one

[Tom_]

what about "locking diff" sensor? Any ideas how measured him? Shorty, do you have tooth numbers yet?

[Val]

Yes, you should have 45 teeth.

[Tom_]

Thank you Val, i checked it up, upcoming week

[Tom_]

So today seems to be problem solved....The problem was in diff fork , that will be too free and when i drive hard, the centrifugal force push fork as a "locked" and then switch automatically ABS OFF. So we locked fork (to the pump, not to move), and on the way back home, i give it a hard time, and everything seems to be OK It was unlucky luck

[Mikes2]

There's a one way valve under the rear seat to prevent this.

I'd consider replacement

[Tom_]

Mike, how its looks like? U think, that problem will be not in the fork but in this one way valve? Any experience how test it?

[M2ki]

Air moves from right to left on the picture. If you can blow air through valve from left to right, it is broken.

[Tom_]

Blow by compressor or just mouth? Thats how looks like rod, its broken or too short. Order new or just enough weld a small piece to reach the rubber on the pump? That small rod is in pump or fork? Because now i am not sure if its bad a pump or fork or both pump is pumping...

[Tom_]

So it looks like fork is good, but the pump missed the rod and thats is whole problem

[M2ki]

As your car is not turbocharged, then it should be fine when you cant blow through it with your mouth.
It is not a pump, it is vacuum actuator with 2 chambers. One side pushes the rod when vacuum is applied and other sides pulls the rod.
Never disassambled one, and not sure if you can fix the rod with welding.
Same actuator is found on C3, C4/100, B3 and coupe quattros.
PN. 857711995A

[Tom_]

I mean actuator, but i cant remember on name, so i wrote pump Thank you. I looke on net for buy one actuator..New is NLA. So only used one or from audi classic, but the price is little bit out