Vehicle & Technical > Discovery

TD5 Disco air suspension question

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Paul:
Has anyone changed a rear air bag suspention unit ?

Me neighbours TD5 has a saggy back end on one side every now and then and we think it's down to a small leak from the air bag...

LR want £350 to replace it  :shock: .... He can get the replacement bag for around £90... is it a job the two of us could do on his drive and if so whats involved, any special tools etc ?

thermidorthelobster:
Not on the Disco but I did with the P38.

It should have been an easy job - jack up the body, drop the axle down, a couple of clips hold the air bag in.

Unfortunately I found it a total mare to get the new airbag fitted without inadvertently pulling it apart.  Once they're in 2 pieces, you'll spit blood trying to get them back together again.  AndyCWB and I were about ready to set fire to the car by the end of the day just to get it over with.

I'd tackle it again, but be careful you get everything nicely carefully installed without messing up the new airbags, and also get the weight of the car back on them before you pump them up.

Before shelling out, you might want to jack the airbags to their highest setting and give them a good cleanout.  I reckon a good bit of dirt between the inner piston and the rubber can make them leak.

Is 90 quid the genuine parts price or for a replacement?  You can buy them from the same manufacturer for much less than the Land Rover price.  On mine the piston was different, though, so you probably wouldn't want to mix them between pairs.

Range Rover Blues:
Like he said, check that the leak isn't caused by dirt but also check that the air pipes are secure and not leaking.

Deflation can also be caused by hardened o rings inside the valves in the valve block.

Paul:
Thanks Chaps,

The plan is to get some soapy water on it and see if we can find a leak, we will check the pipe work leading from the bag too...

Any other hints and tips for replacement of the bag will be greatfully received.

Spooky:
Fairly straightforward, this - it takes longer to safely support the car than to do the job!!! Rememebr, the car needs to be supported under the chassis rather than the axle ...

1. Once the car is supported, remove the wheel then drain the springs by disconnecting the air lines from the compressor assembly (the pipes labelled 12 and 14 in the diagram below).
2. Disconnect the hose from the spring, then remove the 2 clips as illustrated below.
3. Disenage the spring from the axle by twisting anti-clockwise when viewed from above.

Refit is reversal of removal.  Re-pressurise the springs by starting the engine.

Good luck!

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