rear end shooting up???!!

[OwenS]

An interesting quirk has appeared on my BX since its returnto the road. when i brake, e.g approaching a set of traffic lights, and reach a standstill when the brake pedal is released the rear of the car raises up? why?

[DLM]

It's air in the back brake lines - they need bleeding. However, approach the job with caution, loosening juice, plenty of time and a blowtorch to get the bleed nipples nice'n'hot before even trying to free them. Be prepared for snapped ones if they haven't been bled in recent memory.

[sleepy0905]

I had the same problem when i took my car off the road for a few weeks for work I agree the rear brakes need bleeding and those rear bleed nipples are an absolute B*>$<*& so be prepared .

[OwenS]

Actually got a bit confused..the rear sinks and rises when brake pedal is released

[Stewart (oily!)]

strange rear end behaviour is usually air in the rear brakes, theres also a diagnostic to prove your rear brakes are working, something like lower the car, switch off engine, put height lever in normal position, place foot on brake pedal, keeping foot on brake pedal start the engine, the front should rise normally, the rear should stay down until you take your foot off the brake. Not totally sure what it proves but the neighbours dont half stare
Stewart

[Mike E (uk)]

I agree, definately air in the rear brake/suspension circuit.
Replace the bleed screws-you will be pleased you did next time.

My car gets air here when it is left in the garage for a few months- I do not know where it gets in, but a quick bleed and it is fine again.

If anybody knows how it does get there, please share it with us!

Mike

[tom]

nitrogen diffusion from failing spheres.

[OwenS]

well I won't be impressed if thats the case as they haven't been on there a year yet

[Stewart (oily!)]

Mine seems to do it too, I bought a big piece of plastic pipe to bleed back to the reservoir, and my spheres are rather new too

[tom]

That was a fairly flippant remark. Nitrogen does diffuse through the membrane but the most likely culprits will be our old favourite the Doseur valve or, more likely, the rear height corrector being old.

[tom]

That was a fairly flippant remark. Nitrogen does diffuse through the membrane but the most likely culprits will be our old favourite the Doseur valve or, more likely, the rear height corrector being old.