924Board.org

[79porsche]

Took the 924 in for an inspection...(it's been off the road for a while)...and it failed inspection because of no brake lights. Funny thing is that I had brake lights last night. It's pouring today....wonder if I've got water/grounding problems. Discouraging. Well it's better that I know...but it was a bad time for a new problem to show up.

[Chrenan]

Check your hand bracke. There is a small button under the handle that ignites the hand brake light on the dash when the handle is pulled up. If the wire has come loose here, the brakes lights won't work.
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1987 951 - M193 Version for Japan

[Rasta Monsta]

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Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[Ozzie]

?
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[Smoothie]

Lots of funny faces and no words?

Based on the model year you'd have the switch built into the brake master cylinder. (Actually 2 pressure switches as shown at top-left of the diagram on pg260 of the Haynes manual (that's page III of the 1979 wiring diagrams)). Check that wiring at the MC. Following the power supply to the circuit brings you back to the previous page of the wiring diagram and shows power for the brake lights runs through fuse #6, so obviously check that fuse. -Though if it's the fuse, both the interior light/s and headlight motor would be out of service as well.
Later cars got the brake light switch at the brake pedal. It's easy enough to convert to the pedal switch if that's where the problem is (at the mc switch) if you want to..

If it's a water problem - could be high humidity affecting less than perfect connector pins at the back of the fuse-relay panel or even a leak dripping right on the fuse-relay panel.
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[Ozzie]

I was making a face at the statement concerning the hand brake switch which has zip to do with the taillights.
As to the remainder I was looking at his profile and didn't see a model.
'79 could have been his birth year.
You are right about the lights, check the fuses (unlikely), the switches on the MC (later models the brake pedal switch) and the bulbs and earthing
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[Chrenan]

[Rasta Monsta]

[Smoothie]

Aw I's just razzin' ya's fellas. I totally got what the faces were for.

Something's got to be wrong in your wiring Chrenan. Brake lights are too important to safety for them to be wired by the manufacturer in such a way that a warning switch/light malfunction could cause the brake lights to not work, right? That would have been a real sloppy blunder and the kind of thing that there'd have to have been a recall on.
According to the wiring diagram on pg.260, when you hit the brakes, the connection between 81-82a is closed in the pressure switches, then following that circuit back to "C19", then to the previous page you can follow the path through fuse #6 and up to power circuit 30 which is 12V+ always. The e-brake handle switch doesn't (normally) interfere with that 12V+to-pressure-switch-to-brake-lights circuit in any way.
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[gohim]

What happens on the earlier model year cars (76-79) with the brake light switch on the master cylinder, is that the failure to perform scheduled brake fluid replacements allows crud from the brake fluid to accumulate in the switch, and the switch stops working (similar to what happened to the oil pressure sensor on the engine of my 81 924, before I got it).

On 80 and later models, the brake light switch is on the brake pedal inside the car. You can test to verify that the problem is the brakelight switch by removing the two wires from the brake light switch and connecting them together to see if the brake lights go on.

If the brake light switch is the problem, the easiest cure is to update to the brake light on the brake pedal like the later models have. Mounting the switch on the pedal cluster will give you a longer lasting, more reliable brakelight switch. There should already be a hole drilled in the pedal cluster for the switch. The wires on the master cylinder can be pulled back into the car, and they are long enough to plug right into the new brakelight switch that you install on the pedal cluster.

[79porsche]

Thanks guys for the replys. Blown fuse was the reason. I had just changed the driver's taillight lense (original one had a crack) a couple of days ago and all lights were working. We had a rain storm yesterday when I attempting to get the car inspected. I'm wondering if a water leak near the taillight would have caused a blown fuse? I was in a rush to install the taillight... and basically utilized the original bead of black sealer to be used to seal the replacement taillight (knowing that I will be pulling the taillights from the car soon to perform a paint job in the spring). Speaking of water leaks....I have a leak near the rear where the hatch posts are located near the taillights anyway....so I probably need to go back and make sure things are sealed up properly. Maybe there's another reason why the fuse blew. Ideas?
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1979 Porsche 924 N/A

[Chrenan]

[StienbargerR]

Is there a way to wire up a switch at the pedal? I think my renegade mod car might not have brake lights, cause it has an early 911 brake master cylinder.

Ryan
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1978 924 NA
-250lb lowering springs, Euro Pistons

[gohim]

Did you read my post?

[Rasta Monsta]