Sorry, one more XM question
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Thread: Sorry, one more XM question

  1. #1
    WRB
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    Default Sorry, one more XM question

    At stop lights, the rear of the car will sometimes rais up but, more often, drop down to the bump stops. About a minute or so later it will raise/lower itself to the correct height. Is this normal and, if not, what could be causing it?

    thanks

    Warren

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  2. #2
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by WRB View Post
    At stop lights, the rear of the car will sometimes rais up but, more often, drop down to the bump stops. About a minute or so later it will raise/lower itself to the correct height. Is this normal and, if not, what could be causing it? thanks Warren
    Never apologise for another question!

    Forgot to add, my Xantia has always done much the same. If you leave the pedal pressed, that is, and release after a while. All to do with brakes driven from rear suspension spheres and height corrector behaviour I suppose.
    Last edited by JohnW; 1st February 2015 at 01:25 AM.
    JohnW

    Renault 4CV 1951
    Renault R8 1965
    Renault Scenic 2005 (wife's)
    Renault Scenic 2007 (mine)
    Renault Scenic 2006 (daughter's)
    CitroŽn CX Pallas 1980

    National Co-ordinator, Renault 4CV Register of Australia

  3. #3
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    Assuming that there is nothing mechanically wrong, the trailing arm rear suspension reacts to braking by trying to lower the rear of the car. Therefore if you keep your foot on the brakes after you've stopped ,the car senses it is too low & tries to correct. When you remove your foot off the brake pedal the rear will rise higher than it should & of course the car will correct in the opposite direction.
    It is possible to amuse the great unwashed at traffic lights by playing with the brake pedal to achieve a constant oscillation at the rear.
    Provided the rear brakes haven't seized, no Citroen with trailing arm rear suspension will stop with the nose down & tail high in a panic stop like most other cars. Watch a 'D' panic stop & it squats like chook !
    Hop this helps Warren.

    Richard
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