Brake Light Switch Replacement D4

I experienced quite a distinct lag when accelerating form a stop when I first took delivery of my April 2010 D4, it was a real concern (and somewhat dangerous) particularly when trying to pull out and merge into fast moving traffic.

After I had the Q093 upgrade the problem improved considerably however there was still a noticeable lag. I raised the issue with my local dealer who suggested replacing the 'brake light switch'. After that was done the problem disappeared.

As I am a left foot breaker when driving autos the only time I ever had a problem now is if I touch the accelerator before completely lifting my left foot off the brake peddle. The vehicle becomes a little confused thinking that it is still trying to slow/stop rather than go, then it realises that it should be going as no further pressure is being applied to the brake peddle and then all is well.

I have bought and now carry a brake light switch (just in case).

Elsey

Left foot braking is a no-no in D3/D4 - it does the same thing as having a faulty brake switch.

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Originally Posted by jonesy63

Left foot braking is a no-no in D3/D4 - it does the same thing as having a faulty brake switch.

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Yes you are right jonesy63 however it is not only D3/D4s that do not like the brake and the accelerator to be applied simultaneously most current models that depend highly on electronics become confused if that occurs. I was highlighting a potential problem for those who may not have been aware.

When driving in the city, particularly Sydney, I only right foot brake so that there is no possibility of the problem occurring.

Elsey...

We have a 2010 D4 2.7 now done 45,000kms.

Just got home from a long weekend today with the caravan in tow. After stopping at a T junction I noticed that something was not right. Felt like the trailer brakes did not release when I went to take off (running a redarc brake controller). Did manage to drive away from the junction only to get multiple error and fault reports (gearbox, sway assit, HDC, ESC, park brake). Pulled over and tried the old ignition on/off several times without any luck. Decided to limp home as we had only 30kms to go. We got 100 meters up road only to get suspension fault error and car lowered to safe height (LR should rename that "uncomfortable" height especially when you have a 2.5 tonne caravan in tow) :mad:. Ended up getting home ok and noticed that the error codes had cleared when I moved the car (some 30 minutes after stopping).

After reading this thread it sounds like I may have a faulty brake light switch. And now that I think back I also experienced "lag" issues which I put down to "technical wisardry". It was as if the ECU would not give you full power when the wheels were not pointing straight!! And yes did cause some scary moments especially when you needed to execute a speedy merge in peak hour traffic.

Let's see what Southern LR have to say tomorrow.

PS - I tried to get SWHBO on the iPad looking up the AULRO site to relay me some technical advise whilst I was limping the D4 home and lets just say that was a "fault error code" of another kind. At least she appreciates that there is some helpful info on here unlike the crap she finds on wastebook! :D

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Originally Posted by MC D4

We have a 2010 D4 2.7 now done 45,000kms.

Just got home from a long weekend today with the caravan in tow. After stopping at a T junction I noticed that something was not right. Felt like the trailer brakes did not release when I went to take off (running a redarc brake controller). Did manage to drive away from the junction only to get multiple error and fault reports (gearbox, sway assit, HDC, ESC, park brake). Pulled over and tried the old ignition on/off several times without any luck. Decided to limp home as we had only 30kms to go. We got 100 meters up road only to get suspension fault error and car lowered to safe height (LR should rename that "uncomfortable" height especially when you have a 2.5 tonne caravan in tow) :mad:. Ended up getting home ok and noticed that the error codes had cleared when I moved the car (some 30 minutes after stopping).

After reading this thread it sounds like I may have a faulty brake light switch. And now that I think back I also experienced "lag" issues which I put down to "technical wisardry". It was as if the ECU would not give you full power when the wheels were not pointing straight!! And yes did cause some scary moments especially when you needed to execute a speedy merge in peak hour traffic.

Let's see what Southern LR have to say tomorrow.

PS - I tried to get SWHBO on the iPad looking up the AULRO site to relay me some technical advise whilst I was limping the D4 home and lets just say that was a "fault error code" of another kind. At least she appreciates that there is some helpful info on here unlike the crap she finds on wastebook! :D

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That would certainly be no fun!
Would be interested to see what Joe and the guys at southerns come back with.
I have purchased a brake light switch....just in case.
Brett....

MC D4,

Certainly sounds like what happened to me so I hope they sort it quickly for you. Other than the general lag for some time before the major failure, I first really noticed it when turning right into side streets at low speeds when the car refused to accelerate. This seems pretty similar to your experience. Once this happens it is only a short time until everything goes haywire.

In my case they first did a software update, which seemed to prevent all the errors from happening. However, the throttle problems still remained and got worse until they replaced the brake switch.

The car is still running brilliantly since the fix so no bad news yet.

Bob

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

For a $20 part that has the potential to cause so much grief and warranty expense, you'd think they might start routinely replacing this part every 2nd service or so, just to manage the risk.

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Originally Posted by Beamin

For a $20 part that has the potential to cause so much grief and warranty expense, you'd think they might start routinely replacing this part every 2nd service or so, just to manage the risk.

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Now that's what they call "thinking". Nothing like preventative maintenance. Just imagine if a manufacturer would think that way....that could be land rover LoL

Brett.....

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?