auzivision

Didn’t even know this light existed, but the central warning system kicked in an started flashing yesterday. Me thinks I’ve found the culprit today:




As much as I hate to slow down, from time to time it’s good to know the slow pedal is working.

So what is this and how easy will it be to fix? Tips, tricks, wyait?

Mrmerlin

the part you are looking at is the rear brake bias valve they go for about 75.00 they have numbers on them so make sure to replace it with the same number possibly a 55 bar, if you take it apart you will find it filled with corrosion a new part is needed, use
ATE super blue racing fluid when you rebleed the brakes

SeanR

The S4 has an 18 bar bias valve, to with a 33 or so and you will love it. If you put a 55 in you will start thinking you are driving a 911 as the *** will whip around on you.

Mrmerlin

oops I meant a 33 not a 55

auzivision

Hoping the shark is just a brake bleed away from road worthiness.

Long story short... bought the parts, lost the parts, lost track of time, found the parts and then found some time.

Today'photos

Before (just FYI... that Phillips screw in bottom of photo is HOT, don't ask how I know):




After:



Oh ring out of place?



Couple quick questions.

1) O-Ring migration... it appears the O-ring is part of the bias valve assembly... does after photo look correct?

2) Red junk on threads... is this supposed to have thread locker applied?