Snakle535i Posted April 20, 2023 Share Posted April 20, 2023 Anyway driving along normally, hit a small indentation in road (not a pot hole), Heard a loud thud then whole car proceeded to bounce along for a few meters, slowed car down was only doing 30mph at the time. Then accelerated, car fine since although feels a touch bouncy every now and again (not as bad as 1st time). Car has standard MSport suspension with H+R springs. I would of understood sensation if car had comfort suspension fitted but it doesn't. Car is a 2015 BMW F11 535i I suspect faulty shock/s or broken spring. Any Ideas? Don't suppose this has any bearing but rear wiper packed up 2 days prior, new motor on order. Quote Link to comment Share on other sites More sharing options...
Andrew Posted April 20, 2023 Share Posted April 20, 2023 1 minute ago, Snakle535i said: I suspect faulty shock/s or broken spring. +1. Bounce is in theory controlled by the shocks as the dampen out the rebound of the spring. Look for misting at the top of the shocks. If they are leaking you will see it and may even smell a hydraulic oil. I could on mine. Quote Link to comment Share on other sites More sharing options...
4aceman Posted April 20, 2023 Share Posted April 20, 2023 Also voting for shocks! Especially going to lowering springs on the original shocks seem to kill them quicker. Quote Link to comment Share on other sites More sharing options...
Snakle535i Posted April 27, 2023 Author Share Posted April 27, 2023 quick update, now the rear suspension has collapsed and won't raise (I can hear the pump running). Quote Link to comment Share on other sites More sharing options...
Andrew Posted April 27, 2023 Share Posted April 27, 2023 Don't let it run for long as I believe they can overheat. Quote Link to comment Share on other sites More sharing options...
duncan-uk Posted April 27, 2023 Share Posted April 27, 2023 5 hours ago, Snakle535i said: quick update, now the rear suspension has collapsed and won't raise (I can hear the pump running). Sounds like a burst airbag then - had same on my e39 - there is a how too on this. Quote Link to comment Share on other sites More sharing options...
Snakle535i Posted April 27, 2023 Author Share Posted April 27, 2023 Fitted new Airbags 500 miles ago, car is hardly driven long distances at present. Quote Link to comment Share on other sites More sharing options...
0011718 Posted April 27, 2023 Share Posted April 27, 2023 Worth checking the airlines on the bags and valve block for leaks using washing up liquid solution sprayed around the fittings Quote Link to comment Share on other sites More sharing options...
duncan-uk Posted April 27, 2023 Share Posted April 27, 2023 5 hours ago, Snakle535i said: Fitted new Airbags 500 miles ago, car is hardly driven long distances at present. perhaps a line wasnt fitted properly and has come unclipped then? Quote Link to comment Share on other sites More sharing options...
Matthew Posted April 28, 2023 Share Posted April 28, 2023 A failing airbag or compressor isn't going to introduce bounce, that is what the dampers are for. Failing airbags will be obvious as the car will sit lower on one or both rear sides and/or you will end up bottoming out the suspension over rough roads. Quote Link to comment Share on other sites More sharing options...
Snakle535i Posted April 28, 2023 Author Share Posted April 28, 2023 update: Pump motor was working but not pushing air, replaced entire pump assembly on the rear and new shocks on front, car now rides as good as new. Quote Link to comment Share on other sites More sharing options...
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