PaulW_964

I was informed by a Policeman that my brake lights aren't working yesterday. Luckily for me, he was off duty and also my brother

I had the brake pedal micro switch replaced last year and the tail lights are working, which I think rules out the No. 19 fuse. Has anybody else had any similar issues at all?

Harry Apps

Fuse 19 is brake-lights only; tail lights should be at Fuses 40/41.

PaulW_964

Oh right, thanks very much Harry. I read up that they shared the same fuse, but in that case it is worth a look then

PaulW_964

Well fuse 19 looks to be ok and according to Adrian Streather's 964 Bible, no.19 does service the tail lights too - odd.

I'll check the obvious choice and change the bulbs, just in case coincidently they have both gone. Other than that, I guess I have another faulty brake pedal micro switch.

I will post the findings in case somebody else has a similar issue in the future.

boxsey911

I would try checking the pedal switch. I believe there's some adjustment for the point of contact with the pedal....I know with mine that it needs a firm push to make contact and light them up.

PaulW_964

Thanks very much Steve, I will take a look

Harry Apps

Yes, odd! My copy of the "bible" says the same (an error?) but that is at variance to the fusebox label inside the lid - I keep a copy of label with the handbook for ease.

PaulW_964

That's a good idea, cheers Harry

PaulW_964

Update, should anyone experience a similar issue...

Turns out it was a faulty brake pedal switch, which was actually less than a year old - odd hey!! Not an expensive part, but still under warranty so Porsche have given me a new one.

Vandit

I'm not sure if this is true, but I've heard that older 911s have redundancy in the brake pedal switch. They basically have 2 switches, so if one fails, then you got the fallback switch.

PaulW_964

That's interesting Vandit, although mine only had one. Probably could've done with a back up

LPMM

After removing and reinstalling the pedal cluster, my brake lights no longer work (fuse #19 is ok). I can order a new switch since they are fairly cheap, but is there a quick way to test and find out if the switch is faulty?

Dr Mitch

I took my old switch apart - there is a small spring and contacts in there - one disconnected, you can manually depress the contact - I played with the connection and plugged it bag in and depressed the micro-switch with my thumb to see if the brakes light up (in a dark garage). I got it flickering on and off a few times and managed to fix the contact point for a couple of weeks before it wore out again.
Once I replaced it it worked fine and then stopped again after I put new rotors and pads on - I had to adjust the switch - if the plastic hex nut is too tight I found the nrake lights wouldn't work consistently...

LPMM

I had the switch out of the pedal cluster and played with it but no luck. Then, I read your post about taking apart, which I tried and ended up breaking the housing. So, a quick call to Sunset and the new switch should be here on Friday. Hopefully, it solves my issues.

bmohr

I have a strange issue I'm really scratching my head on. My passender(right) brake lights are not working. I measure 12 volts at the assembly and the bulb is good, but it won't light up. Further complicating this issue is that when I turn on the head lights it is the same circuit as the brake lights. So if I have the lights on, when I brake there is no change in intensity. Only the one filament is lighting up. I'm really stumped. I did remove my 3rd(upper) brake light some time ago, but this issue is current so I have to assume it is not connected. Fuses 19 and 40 are good and do indeed function as intended.