c5 mark 1 mystery brake bleep

[kevino]

Hi guys, not been on the forum for a while but I've got a weird problem which started this evening.
When i am travelling along at about 30ish and i put my foot on the brake peddle I get the same bong as when i put the car in reverse.
Any ideas what i should check ? I'm puzzled by this one.

[Michel]

Have you got it wet recently? One of mine used to flash up brake warnings and bongs when it had been raining heavily - "braking system fault" being my favourite. Having had Citroens for so long, I simply tested the brakes and ignored it .... it went away.

[kevino]

no not wet only thing is I've only had it when the air con has been on, so far. i will test again tomorrow without air con

[mickthemaverick]

Sounds to me that it might be a short circuit type fault in a rear light unit so the reversing cct is getting powered by the brake lights. Just a thought - happy to be shot down in flames

[kevino]

cheers mick, its definitely food for thought. I'll have a look

[wheeler]

Strange one right enough, not one I've heard of. Yes I would start by checking that all the rear lights are working as they should be.
Have any bulbs been changed recently? does it have towbar electrics?

[kevino]

hi wheeler, no bulbs changed recently! i do have towbar electrics, never used them as i still haven't got a caravan, but I'll get them checked out. thanks.