911uk

Failed MOT..brake light

Add to repair workspace

New repair projectOpen repair workspace

Original source

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHFailed MOT..brake light

Reported or suspected cause

switch itself or it is out of adjustment

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that suspect a cause: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suspected cause
Most likely the switch itself or it is out of adjustment.
Original post Read captured discussion
Failed MOT..brake light

Read full discussion summary

Leading evidence: 'switch itself or it is out of adjustment' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'switch itself or it is out of adjustment' (1 discussions; 0 report identifying it and 1 suggest it). No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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

Read captured replies

1 matching discussions · 6 captured posts examined · 0 partial discussions

Reported and suspected causes (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

switch itself or it is out of adjustment

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that suspect a cause: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suspected cause
Most likely the switch itself or it is out of adjustment.
Original post Read captured discussion
Failed MOT..brake light

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.

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

911uk: 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: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

My 996 failed it's MOT yesterday, the brake lights come on but flicker and go back off, the station thought it might be a switch on the pedal, anyone else had this?, Lee

POST 2Original post

Most likely the switch itself or it is out of adjustment. You could try re-adjusting it. Unclip the switch from the bracket by twisting it 1/4 turn, then pull out the plunger as far as it will go, and re-fit the switch. On the subject of MOT failures, VOSA recently released MOT results for all cars tested in 2007. I extracted the 911 figures for 1997-2005, which makes interesting reading. Hopefully this link works:

POST 3 / ORIGINAL POSTEROriginal post

Thanks for the info Richard, I coudln't read the link...but am intrigued now, can you post it again, Lee

POST 4Original post

I meant the link to the table embedded in the post. Sorry it's a bit small to read, but you can right-click the image and choose "Save Picture As.." to save it on your computer and then open it full size.

POST 5 / ORIGINAL POSTEROriginal post

Yes interesting, 2002 have highest failure rate (mine), within that the most common reason is lighting and signalling (mine again), thanks, Lee

POST 6Original post

Hi Lee, I had this on my '99 C2 and was a failed switch. They are fairly cheap to replace and, as long as you are happy contortnig yourself under the steering column for access, a fairly straightforward DIY. You'll probably have to unclip a bit of aircon ducting but once you have access they do just pop out with a quarter turn as Richard says. I tried readjusting mine but to no avail, the light would come on about a quarter of the way through a press on the brake pedal but would cut out with more pressure, so you could show your brake lights to following cars with a gentle press on the brakes but would lose the light when full braking pressure was applied.

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