Thread: Brake Light Switch Replacement D4

Originally Posted by Graeme

Oils, filters and brake pads are replaced before the absolute end of their useful life during normal servicing so why not a part that retails for only a few dollars and is easily accessed, perhaps every 2 years or 50K kms?

especially if it would avoid irate customers and tainted product/brand image - no brainer you would think.

Is it possible to replace the two contact switch for two single contact switches, one n/o and one n/c. That way the low power switching n/c contact would not get fouled by dust created by the high power switching n/o contact. For those that know how the conacts are located inside this swtich I would be rotating the switch if possible, putting the n/o contact for the brake lights on the bottom to try reduce the amount of dust fouling the important switch. Definately sounds like a spare part to have in your kit.

Originally Posted by Graeme

Not being able to just drop into a dealer to get a spare switch, I've ordered one from the UK costing $22 delivered.

That's excellent do you mind saying where from and the part number if it is different to the one in the first post? I assume it's also for a D4.

Another thought do you think these dodgy brake light switches also contribute to the old push the start button with no start syndrome?

Mine seems to come and go you get in the car foot on the brake push the start button and all lights go on but no start do it agin and everything is fine.

Duke4,

I had starting problems occasionally with my dodgy switch. Just before the complete failure of the switch my wife couldn't get it to start and ended up putting the key fob up under the steering column as she read in the manual might fix it. This got it started that time.

No problem at all with starting the eingine since the switch was replaced so it must have been having some effect. Ever since we started to drive to Perth from Sydney after picking up the car in December we have had the odd problem with the car telling us to press the brake or not wanting to let the engine start. This has all gone now.

Bob

Originally Posted by Duke4

That's excellent do you mind saying where from and the part number if it is different to the one in the first post? I assume it's also for a D4.

This is what I've bought Genuine Discovery 3 & Range Rover Sport Brake light Switch(XKB500110) | eBay 4.85 GBP postage.

Took my car in to Southern LR today and they ran a diagnostic check. They reckon my brake light switch checked out ok and suggested that my issue may have been feedback from the trailer brakes. I know that Sniegy's EBC install recommended a diode be fitted to stop feedback and I have had that little job stuck on my TTD let for some months now. Looks like a job for this weekend!

Once again good service at SLR and no charge for their time today (they did comment that the brake controller install was very professionally done apart from the diode issue - thanks to Sniegy's excellent post of course!)

Well bugger me....

So I've been reading this topic for the last few days. Last night i decided that i would get a spare brake light switch while the car was in for its scheduled 52,000km service today. I hadnt had any of the problems outlined here but its a cheap small part to give me peace of mind in our outback trips.

Well, I'm driving the 20 kms to the dealer this morning and i get the delayed throttle response twice while driving in the peak hour traffic. It wasnt a minor delay. It was long enough for me to dabb the throttle 2 o 3 times before i got a response.

Got to the dealer, told them the symptons and that i though it was the brake light switch. The tech sort of agreed and said they would look at it.

On picking up the car they said there were no fault codes logged for it and they could not replicate it. I just purchased the spare switch and decided to head home. Well it did it again on the way home...so looks like a trip back to the dealer soon.

Does anyone know if a fault code does get logged for this problem?

The car is a my10 d4 with 47,000km on it.

Whilst there is every chance that the feedback from my caravan brakes may have caused my issue the other day I am not totally convinced that my brake switch is "cleared for take off" so to speak. The lag issue is still in the back of my mind and I will be paying closer attention to the frequency and conditions that it occurs. I still plan to get a spare and keep it in the car!