Rear end rising

[Defender110]

The back end of my TGD rises after applying the brakes and coming to a stop at traffic lights etc. With it being an auto I will keep my foot on the brake pedal after stopping and then feel the car going up at the back end, could this be a doseur valve problem? I think I read somewhere it mihjt also be the rear brakes that need bleeding, any ideas appreciated?

[Brian]

Yes, I had this feature many moons ago, twas air in the system.

Turned out to be a nitrogen leaking sphere.

Check all corner spheres for a consistent bounce.
Time the ticks on the pressure regulator for the accumulator sphere.

May give you a clue.

[Defender110]

Thanks Brian. The car drives fine but every time I stop at some lights I see people pointing and laughing thinking it's some sort of stunt car!

[ken newbold]

Tim's TZD has the same problem, I think the above diagnosis is correct.

[Tim Leech]

Tim's TZD has the same problem, I think the above diagnosis is correct.

I wish I hadnt bought that car! so I need a new accu spheres aswell as a gearbox, welding........

[Philip Chidlow]

It'll be worth it Tim! Sounds like it's a decent enough BX - and once sorted perfect for the CCC2012.

[ken newbold]

Tim's TZD has the same problem, I think the above diagnosis is correct.

I wish I hadnt bought that car! so I need a new accu spheres aswell as a gearbox, welding........

No, I think your old rear spheres are what leaked into the system, you just need the rear brakes bleeding. and a gearbox and welding

[Tim Leech]

Tim's TZD has the same problem, I think the above diagnosis is correct.

No, I think your old rear spheres are what leaked into the system, you just need the rear brakes bleeding. and a gearbox and welding

Ok when do you want it back then!

[Kitch]

It's because being an auto you aren't releasing the brakes once you've stopped. The rear suspension actually dips a bit when you brake (most cars dive, but of course the BX has anti-dive) and due to the layout of the suspension you find the suspension compresses slightly as you slow down and stop. When that happens, the rear height corrector is probably noticing that and compensating by trying to raise the rear suspension, but of course it's not ideal because once you release the brakes and the back end is free to return to normal height, it's then raised further by the fact the height corrector thinking that it's being clever.

Unless I've misread your problem, that's what's happening I think. Only way to stop it is to get off the brakes as soon as you've stopped, because if you hold the brakes while the rear suspension is trying to get to normal ride height, it'll only think it needs more pressure and keep pumping. If my theory is correct, it'll do it in correlation to how hard you've just pulled up.

Mine does a similar thing (I expect others that can accelerate hard enough do too) in that when you floor it, the back end squats. But if you keep it pinned, over time the back end raises back up as it suddenly assumes you've got something heavy in the boot (you have.....G's!). When you release the throttle, the back end shoots up in the air only to find itself out of bed way up high. You know it's done it because you suddenly find your headlamps pointing at the road 3 feet in front of you.

I've just decided, this is a new performance test for BXs - if you can't confuse your rear suspension under acceleration, your engine isn't powerful enough and needs more beans.

[docchevron]

I've just decided, this is a new performance test for BXs - if you can't confuse your rear suspension under acceleration, your engine isn't powerful enough and needs more beans.

Even my diesel will do that!

Tend to agree though, Phoenix is the same, and an auto, if you just stop apply the handbrake and release the service brakes, no issue, if you hold it on the service brakes then the back does indeed rise as the HC thinks the car is too low (which it is a bit) then you release the brakes and it raises too far and has to settle again.

My valver does the same thing if you really pull up in a hurry.
I imagine the diesel is the same aswell, but I never puch it hard enough to find out!

[Mike E (uk)]

It will be gas in the rear suspension.

When mine has been stood for a while without being driven, the gas creaps into the rear suspension.

I have replaced the spheres, but apart from bleeding the rear brakes I have found no cure, and the gas will appear again after a few months.

so I am watching with interest for a cure.

Mike

[Defender110]

It will be gas in the rear suspension.

When mine has been stood for a while without being driven, the gas creaps into the rear suspension.

I have replaced the spheres, but apart from bleeding the rear brakes I have found no cure, and the gas will appear again after a few months.

so I am watching with interest for a cure.

Mike

Yes it is deffinately gas in the system I tried to bleed it out of the brakes and did get some out but it has gone again. I can drive my TZD exactly the same and that doesn't rise at the back at all and you can feel the rear brakes when stopping hard where you cant on the TGD, it is more likely to lock the front wheels before the rears take any real effect.

[MULLEY]

Is that an indication of a fault with a sphere? Or is this just happen gradually overtime? If the leak is minor, i wouldn't have thought it would have affected much & wouldn't the nitrogen eventually end up in the lhm tank & as such it would be getting vented out?