Rennlist

Brake booster leak

Add to repair workspace

1 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHBrake booster leak

1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

Insufficient extracted evidence does not mean there is no answer in the original discussions.

1 matching discussions · 1 captured posts examined · 0 partial discussions

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

1 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T005001Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Edit: Huh.. It's not the brake booster - it's the ABS unit. [ 1999 C4 ] See attached photo. This is the BACK of the milled aluminum block to which all the brake lines are fitted. On the back there is a center milled hole, and two plastic caps. In the photo the left cap is removed exposing a brass nipple. When I brake, all is normal for a couple of seconds then the pedal sinks a little because brake fluid is oozing out of this brass nipple. What is it? A burst valve or something? O-ring? Ideas on steps? I'm hoping this is just a failing part like a burst valve or an o-ring and not a failsafe burst valve being triggered due to something more serious. Thanks in advance Keith

This is a source reference. Confirm exact model applicability in the original material.