newmexico

These forums are incredibly helpful. All of the sudden my brake lights aren't working at all. Reverse,blinkers all work fine. Where do I start trouble shooting? This is my first older Porsche I have purchased knowing work was going to be needed. I want to do the work myself. Thank You!

Ed Hughes

The pressure switches on the master cylinder are usually the culprit, and a simple fix.

aj986s

Total/multiple bulb failure is always possible, but unlikely. I would check the brake switch at the brake pedal first [CORRECTED: 911 has brake pressure switch on the master cylinder]. If that tests ok, possible wire break needs to be traced. My money's on a failed brake pedal switch.

theiceman

there is a brake pedal switch ? i thought the only switches were pressure switches on the master cylinder as Ed mentioned.

aj986s

I stand corrected. I mistakenly assumed the car used a traditional brake pedal switch.
I admit I'm not a 911 expert, however both our 944 and Boxster have switches on the pedals.

Ed Hughes

Where's the money?

Mister Moo

The pressure switch failed on mine last year; pedal needed progressively more and more pressure to activate brake lights. Changing the switch is easy IF you have a deep offset 22mm box end wrench. Expect a little dribble of brake fluid; keep a rag underneath and don't waste a lot of time.

https://rennlist.com/forums/911-foru...ight-tool.html

theiceman