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Arif

Lop sided rear

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Hi all,

Need some advice please.

 

My m535i wasn't sitting level and was leaning towards the passenger side (very obvious on the rear). It was decided that shocks and springs needed changing. All 4 were changed and rightly so as all the shocks were shot and springs didn't look too healthy either.

 

Once all new parts were fitted the car was still leaning towards the passenger side. The front is fine it's the rear that is the problem. I have measured the distance from the floor to the top of the arch on both sides at the rear and the passenger side is sitting 8mm lower.

 

What could be causing this? Can't see any signs of previous accident damage and the car drives fine.

 

Thanks in advance.

 

Arif

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There are a number of things it may be. The spring itself may be shorter, or softer, or the spring pads on either end of the spring may be thinner. Realoem shows two different upper pads, depending upon the spring fitted. http://www.realoem.com/bmw/enUS/showparts?id=DC72-EUR-03-1985-E28-BMW-M535i&diagId=33_0250 

 

I would swap the spring damper units side to side and see if the lean moves to the other side.

 

Are you sure its on a completely level bit of ground?

 

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6 hours ago, JohnH said:

There are a number of things it may be. The spring itself may be shorter, or softer, or the spring pads on either end of the spring may be thinner. Realoem shows two different upper pads, depending upon the spring fitted. http://www.realoem.com/bmw/enUS/showparts?id=DC72-EUR-03-1985-E28-BMW-M535i&diagId=33_0250 

 

I would swap the spring damper units side to side and see if the lean moves to the other side.

 

Are you sure its on a completely level bit of ground?

 

Hi John,

I had put the new springs side by side before fitting them and they were the same length. both pads upper and lower were bought from BMW in pairs so these are the same as well. In the RealOEM link I have number 3 - 507 and number 14 - 572). I'll have a go at swapping the whole setup to opposite sides and see if the problem transfers. All parts I have used were brand new and OEM. 

 

The car was definitely on level ground and has the same difference in lengths (8mm) on level ground in other places I have tried.

 

If the above makes no difference and it's still lop sided on the passenger side do I then assume that it can be the rear axel carrier or trailing arm that may have had a whack in the past and gotten out of shape slightly? Can't see any signs of this but seems like the next logical step.

Edited by Arif
more detail

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Hello Arif,

 

Springs ratings do vary slightly so swapping side to side might highlight that. If that is the case then the other spring pad, which may be a non M, may be thicker, so could perhaps be used to even the ride height.

 

I've just thought, do your dampers have height adjustment. Some M535i dampers do. If so, are they set the same?

 

8mm is not much, so I suppose a bad subframe outer bush may affect it a little, but I wouldn't think so, so that only leaves a bent trailing arm.    

 

Regards

John.

 

Edit, One other thing, when measuring ride height you should really measure from the underside of the lower portion of the wheel rim to the underside of the wheel arch. This eliminates the tyre from the equation.

Edited by JohnH

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