Recently aquired 1995 1.9 TD VSX Xantia estate with the hydra-active suspension.The(iIthink rear) brakes seem to be binding slightly,rear end dips down on takeoff and brake is obviously on intermittently when stationary,although never when left for any length of time.The LHM and return filters need to be changed and cleaned soon.Could this solve the problem?While the car was in for some other work I got the garage to check the pistons and they said all was O,K.Could there be some residual pressure in the braking system ?The filters are definately clogged up.Or is there some sort of distribution valve might need changing,I was under the impression that the rears only come into play under heavy braking and only a light application is enough to show up the problem.
Edited by Pugugly {P} on 21/01/2008 at 22:34
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isis
I don't do the grubby underneath bits; but - handbrake cable seized?
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"I don't do the grubby underneath bits;"
Clearly not, since:
" but - handbrake cable seized?"
The handbrake is on the front on the Xantia... :-))
The rear brakes can and do get corroded - particularly between the caliper and the trailing arm which twists the caliper and makes all sorts of oddities on the brakes. However, it's possibly not the brakes at all - a hydractive car with dirty LHM, suspect spheres, dodgy hydractive valve, and a sticky height corrector (that will be most of them by now!) will exhibt all sorts of odd rear end behaviour - the rear rising on braking then settling down again when you stop; the rear dropping soon after you start up in the morning; the rear dropping or rising suddenly as it switches from hard to soft mode. Hydraflushing the hydraulics, lubricating the rear height corrector, and giving the rear brakes a good clean (including removing the calipers and filing the 'rust' off the back) is a good start.
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With that suspension problem won't that opperate the load weigh valve to give more pressure to the rears?
good idea to strip and clean up the discs/pads if badly rusty replace.
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Richard
I had a nasty feeling that the H/B was on the front [got kinda pushed into this one] - but I knew that you'd be along soon enough.
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Thanks for the replies.I would say that the rear dipping on take off is certainly caused by the brake binding as it's proportional to how much they are binding.Its like pulling off in a car with a rear handbrake on slightly or not ie when the brakes not binding it dosn't and the height seems to be behaving itself pretty well otherwise.Interesting to hear that the height corrector can be lubricated ,are the instructions in the haynes manual ,mines not to hand at present.I would like to use some hydro rinsage but a local Citroen dealer wants to charge about £70 for 5 litres!!!! I can buy it from a Total distributor for £2.80 a litre +vat but minimum quantity is 20 litres!!!(4 5ltr cans)Any recommendations?The spheres have all been replaced recently at a Citroen dealer cost£450 disgracefull that they did that without changing the LHM etc .Probably quoted the previous owner a similar amount to do so, so understandable I suppose. If I can get some rinsage at a reasonable price should I bleed the brakes too to ensure all the pipes are flushed? If I can't ,would changing the LHM and doing the same be a worthwhile exersise?
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