405 major knock Front Offside

[jgra1]

Hi All, I am trying to do a favour to a friend by getting her 405 through its MOT (that is now done, but there is a very ominous knock from front drivers wheel area)

For the MOT I did,

2 x disks
Both Offside inner suspension arm bushes

that is all i have done in that area of car.
The bushes are new, the ball joint is good, the roll bar is fine, and yet there is this loud knock , you can feel it thru body of car (even the wing mirror moves!).

I had to lower the subframe the help with Suspension arm removal, but that has been bolted up properly.
The knock ONLY happens under heavy braking, and only after you have gone back a bit and then forward again. (i.e. the problem has reset itself)

I have one clue, the suspension strut is very loose in it's mounting, so, with the lower arm removed, you can move the strut easily around under the wheel arch, and also you can lift if about 10mm up in the air. The looseness is in the (cup bush cup) area at the top.

my theory, hard application of the brake it twisting the whole strut enough to make this bad noise?

any one else hazard a guess?

thanks as always
John

[PowerLee]

That sounds like a worn out top mount to me