[HELP] Brake Light issue

[PurpleTurbo]

Hi, ive recently bought a 940 Celebration. I know its a common problem for the brake lights to not work at all and it be due to the light failure relay.

This is an issue in this car too however I found some loose connectors in the footwell above the brake pedal and I was wondering if anyone could tell me what they are for and if this could be the source of the problem instead of the relay? Thanks in advance.
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[griston64]

It could also be the brake light switch. That was my issue. Mine only needed adjusting

[PurpleTurbo]

Originally Posted by griston64

It could also be the brake light switch. That was my issue. Mine only needed adjusting

Could you tell me how id go about doing this? I'm not very mechanically minded but I got this car with the intention of learning how to do stuff myself.

[griston64]

Brake light switch.jpg

The switch shown will be above the brake pedal. If I remember rightly when you push down on the pedal it releases and your brake lights come on. If it's too close they won't come on. That was my issue but the switch could also have failed.

[griston64]

This diagram shows it better

brake light switch.PNG

[PurpleTurbo]

Originally Posted by griston64

This diagram shows it better

Attachment 132559

Ah brilliant thank you, I'll go have a look at it tomorrow and hope it just needs adjustment

[PurpleTurbo]

Originally Posted by griston64

This diagram shows it better

Attachment 132559

Also I feel like the relay is working as when I got the car it had a dipped beam bulb out and the symbol was on the dash

[bob12]

Originally Posted by griston64

Attachment 132558

The switch shown will be above the brake pedal. If I remember rightly when you push down on the pedal it releases and your brake lights come on. If it's too close they won't come on. That was my issue but the switch could also have failed.

I have just had to deal with that switch on my V70 auto on the brake pedal as the stop lights were on all the time and I had to remove the fuse to turn them off!! To make it more awkward on an auto the cruise control switch is is mounted directly above it.

The button of the switch remains in contact with the brake pedal all the time (i.e. the switch is off) until the pedal is applied when the button of the switch is not held in and and current flows to the stop lights as the pedal moves downward.

To adjust the switch without disconnecting it wedge the brake pedal in the depressed position. Hold the switch in position in the bracket and push the the wire plug in. The white section is the auto adjustment and will be pushed outwards. Make sure it is fully out (in this position it also releases the plastic tabs that hold the switch in position should you need to remove the switch).

Now, still holding the switch gently release the brake pedal. You will hear a clicking sound as the auto adjust both fix the switch in position and sets the switch button against the brake pedal. The wire plug end of the switch moves backwards towards you during this process.

If the switch is not faulty ... job done.
Bob

[taiwan740]

I'm convinced replacing the brake bulbs on a 940 is the most difficult mechanical job on these cars. I can replace front brake discs and pads faster than it takes me to replace a bulb. Having to sneak my claw through the frame to get at that holder, and then trying to align the keys with the hole, and then inevitably the metal tabs will be corroded or bent too far back so it has to come out again, back round to the car, fire up the engine to start cos the relay/light is always on at ignition.

If it goes again i'm getting the garage to do it lol

[PurpleTurbo]

Originally Posted by griston64

Attachment 132558

The switch shown will be above the brake pedal. If I remember rightly when you push down on the pedal it releases and your brake lights come on. If it's too close they won't come on. That was my issue but the switch could also have failed.

Hey, ive had a look today and for the life of me I cannot find anything that even resembles that switch, there is this little notch where i guess it should be? I could be wrong though
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