Will warped discs damage control arm bushes?

[kevin316i]

A few months ago I got the control arm bushes replaced as this is what the mechanic reconed was causing the vibration I was getting through the brake pedal and steering wheel. However, the problem was still there, though not as bad as before. I got him to check it again and he said he couldn't see any issue but I know its there and can feel it.

Being pissed of with this guy I decided to replace the front discs and pads myself, but I have been so up the walls busy at work and home a few months have now passed.

Planning to get the new discs and pads this week, but is there a chance that the good bushes have gone bad in the mean time, so that when I put on the new discs they could in turn get warped due to the bushes?

Should the bushes also be replaced at the same time (again )

Thanks,
Kevin

[kam-325i]

The warped disk thing, in my opinon, is mostly a myth, 99% of vibration felt through the steering under braking is caused by " Material Transfer". This is when brake pad material gets "Baked" on the face of the brake disk after hard braking, and then leaving your foot on the brake, this cause's a difference in friction co-efficent(sp), which feels like a warped disk under braking.

A buckled wheel might cause it aswell.

It might cause your new TCA bush's to wear premeturly.(sp)

[Brianmoooore]

Control arm bushes aren't likely to have been damaged in a few months, unless the vibration was horrendous.
Control arm bush failure tends to give vibration at certain speeds as well as light braking.
Brake inspired vibration only happens when the brakes are applied, and varies with road speed at the time.

[Cava]

[quote="kam-325i"]The warped disk thing, in my opinon, is mostly a myth, 99% of vibration felt through the steering under braking is caused by " Material Transfer". This is when brake pad material gets "Baked" on the face of the brake disk after hard braking, and then leaving your foot on the brake, this cause's a difference in friction co-efficent(sp), which feels like a warped disk under braking.quote]

I must have got the 1% you mention twice!

I ended up replacing two sets of discs in a couple of months - one caliper was diagnosed as being partially seized and causing the disc to warp. Turned out to be the other caliper after it wrecked the replacement disc. I did'nt believe it was the discs at first (suspected a control arm bush) so I stuck one of the 'warped' sets on my other car. I drove it for about 10 minutes and nearly shook my fillings out everytime I braked. So, the discs were definately being warped by the dodgy caliper. The car now has two new calipers and genuine bmw discs / pads. Absolutely perfect now!

[kevin316i]

Thanks guys. I'll get the finger out tomorrow and get a set of original discs and pads from the local dealer, and see how it goes.