S212 2014 wandering under acceleration

[robsterpaterson]

Hi all. History - had rear subframe of my 2014 E350 estate checked last year (October) and all was deemed well. Literally just had MOT done at local (non-specialist) garage and no mention of corrosion...apart from a rear brake pipe of course. They changed that by cutting/routing it differently to avoid subframe removal)
I've recently changed both rear airbags and the airlines along with the compressor.
I'd only driven it 10 miles to the MOT station after changing the rear suspension and it all felt fine. However this afternoon driving home from it's MOT it's started 'drifting' to the right under hard acceleration which is noticeable through the steering wheel. Upon lifting off, it seems to snap back which is again noticeable through the steering wheel/****.
I'm going to look for anything the garage may have loosened to do the brake pipe. The wheel nuts are tight and the tyre pressures are fine.
If that yields no joy then I'll call the MOT place on Monday to see if there's anything they may have done.
Worst case scenario I'll pop it back into Mercedes for another 'free health check'.
From what I've said, any ideas??

 

[robsterpaterson]

For anyone interested...it was the RH rear lower control arm. Bush had worn so end of arm had migrated allowing movement if wheel under acceleration/braking.

 

[TrueSpirit]

For anyone interested...it was the RH rear lower control arm. Bush had worn so end of arm had migrated allowing movement if wheel under acceleration/braking.

Was just going to say i had a same problem in my w211 and under hard acceleration the front end was misbehaving considerably, bushes were worn and upon replacement, it was running great

 

[DSM10000]

For anyone interested...it was the RH rear lower control arm. Bush had worn so end of arm had migrated allowing movement if wheel under acceleration/braking.

Surely this should have been picked up by the MOT tester?

 

[robsterpaterson]

Surely this should have been picked up by the MOT tester?

I would have thought so, however;
It maybe literally just happened as I was pulling away from the garage.
It was a partial retest after getting a brake pipe renewed. So it may been fine the previous week during the 'proper' test and maybe happened on the way in for the rework (or when I took it home after the fail). I certainly didn't notice anything on the drive there...but then again I wasn't horsing it as the MOT had expired .