Two Faults In Six Days - Trip Computer Reset And Rusted Rear Discs

[KeithE]

Hello everyone.

I had my 2008 2.0 diesel exclusive auto for less than a week.

I collected it Thursday and drove it to work where it was parked until yesterday evening.

I've driven it home yesterday and back to work this morning, a round trip of about 45 miles.

I've noticed that the rear brake discs are rusted as if the pads weren't applying.

I'm not a heavy broker.

 

And pressing the button on the indicator switch won't reset the trip computer.

It's as if the display was frozen.

Both trip computer show exactly the same fuel consumption etc and nothing changes throughout the journey.

Help me please.

Tia

Keith

[paul.h]

The trip computer switch is on the end of the wiper stalk, not the indicator stalk. When it gets to about 6200 miles (9999 km) it stops going up since it would need an extra digit, so it needs to be reset by holding in the button on the end of the wiper stalk.

 

Sounds as if the rear brakes need servicing since the pads may be seized and need cleaning up. Could also be a seized caliper. Being a 2008 on exclusive C5 (X7) the handbrake is electric and if you need to fit new pads it may need a diagnostic to calibrate it again. In your handbook it tells you how to manually take the handbrake off so the old pads can be removed but keep your fingers out of the way in case something happens and the handbrake comes on.

 

Relevant topics found by an advanced search on 'handbrake' - 1st a seized caliper and 2nd replacing the rear pads

- http://www.citroen-owners-club.co.uk/citroen/topic/22759-c5-woes-brake-pad-warning/?hl=handbrake&do=findComment&comment=84303

- http://www.citroen-owners-club.co.uk/citroen/topic/22636-c5-tourer-rear-pad-change-with-electric-handbrake/

 

I have put your car details on your signature to save you mentioning it every time you post.

[KeithE]

Thanks for the swift reply, but I've just popped out and tried again The switch on the wiper stalk controls the radio info panel in the centre of the dash.

[paul.h]

We need somebody with the same car as yours to help with the trip computer, it appears Citroen are using different buttons for it than other models and I had a quick look in a handbook and could not find it.

[KeithE]

The company mechanic ia going to have a look at the brakes over the next day or two (if time allows), I'll let you know the result. I forgot to mention, the car was serviced about 4000 miles ago and all the pads are new.

But does anyone know if the indicator switch can be disassembled, similar to how the wiper switch can be in the earlier versions please?

Edited August 8, 2016 by KeithE

[coastline taxis]

08 was the year they changed model design is yours a mk 1 revamp or a mk2.  Contary to popular opinion there isnt actually a mk3. theres m1 then a mk1 revamp and a mk2

[KeithE]

Mines a 2008 X7

So does that make it a mk2?

Edited August 9, 2016 by KeithE

[KeithE]

Apparently the brakes are working OK.

But, probably, because they're the rear ones the pads are obviously not going to clean the discs properly.The car may have just been stood too long before I bought it.

New pads and discs about £65 from my local motor factor.

I'll see if the dealer will pay under warranty.

My tame techie has also run diagnostics and the ecu is showing an unspecified fault with the egr valve although the engine appears to run OK and there's no Em fault showing on the dash.

Just need to sort the trip computer now and I'll be a happier bunny.

Edited August 9, 2016 by KeithE

[paul.h]

Officially your car is a mark 2 with the 2004 to 2008 model being a revamp of the mark 1. However, it causes confusion so usually yours would be referred to as a mark 3 but it is better to call it the C5 (X7) to avoid the confusion.

[KeithE]

I've had the car on the brake rollers and they're all working OK.

I've done an mot history search and it's had three advisories for the discs, but unless they are severely worn or cracked it can't be failed.

[paul.h]

The rear brakes may still need cleaning up, despite the test on a roller. You could do your own test by setting the suspension to max height, switch off and remove the igntion key, then jack up and spin the rear wheels and see if the wheel is stopped by the slightest touch on the brake pedal - if not then the pads are a bit seized. When I got our 1st C5 it was about 1½ years old, the rear discs were rusty and driving/hard braking did not clean them up. The dealer service manager gave some b**t about a pressure reducing valve limiting braking effort at the back, not wanting to sort it. Anyway, I took the brakes apart and found the pads had seized in the calipers. After cleaning/greasing the problem went but eventually I replaced the discs/pads.

 

Note that since you have the hydractive suspension, if you are going under the car axle stands should always be used to support the body since if a height adjuster is caught the suspension can quickly drop to a very low level. The suspension should also be set at maximum height before jacking up to avoid possible suspension problems - this will be in the handbook somewhere.

[paul.h]

This topic has a post by randombloke which says how to reset the trip computer, a steering wheel button is pressed http://www.citroen-owners-club.co.uk/citroen/topic/24125-c5-x7-08-exclusive-miles-kilometres/

 

On the steering wheel centre, when the car is stationary with ignition on and engine running:

 

Press the left hand thumb wheel briefly, not a long hold as this resets the trip.

[KeithE]

This topic has a post by randombloke which says how to reset the trip computer, a steering wheel button is pressed http://www.citroen-owners-club.co.uk/citroen/topic/24125-c5-x7-08-exclusive-miles-kilometres/

 

On the steering wheel centre, when the car is stationary with ignition on and engine running:

 

Press the left hand thumb wheel briefly, not a long hold as this resets the trip.

[KeithE]

Thanks for that.

I was just about to post that I'd got it sussed.

I re-read the handbook.

I've no idea why I thought the left stalk button was the trip reset, it's actually for the satnav voice activation, which I don't have.

DUH!

[MikeLane]

Hi Paul - re:

"The dealer service manager gave some b**t about a pressure reducing valve limiting braking effort at the back"

This was certainly true on my BXs and Xantia. The rear brakes only operated when braking quite hard or the car was heavily loaded so the disks tended to rust (and pistons seize). I had to change the rear disks a couple of times in 130Kmiles on my first BX and make sure the pistons weren't seized before MOTs.