Judder when I brake

RobAMerc

Folks,

The brake pedal started juddering when I brake from higher speeds so I replaced the front disks.

It seemed fine for a bit but now its started happening again.
The only thing that did change was that I went from winters to summers ( and the wheel balancing seems to be not suite perfect )

Could poor wheel balancing be the issue ?

Something else wrong maybe ?

biko

If you can, swap the front tyres to the rear.

Did you change pads as well as the discs?

RobAMerc

biko wrote: »

If you can, swap the front tyres to the rear.

Did you change pads as well as the discs?

I could do it for a test I suppose, but I had put the fronts on the back when I swapped from the winters.

disks and pads yes

CorkMan_

Why did you have to put the fronts on the back? Could they not get them correctly balanced? We'd a similar issue and ended up getting new wheels which sorted the problem. Ours were slightly buckled which couldn't be fully balanced out. So I'd start, (if you're sure you don't have a sticking caliper - as you said when you initially changed discs and pads that the judder went), is by getting the wheels balanced again and checked for buckles. Another thing was it new or part worns you had fitted?

H3llR4iser

Check tyres and balance; There's a very small chance it could be a tie rod end, but I'm afraid you may have a warped brake disc yet again.

Did you have to perform an emergency brake from higher speeds at any point after changing discs and pads? One "thermal shock" is all it takes to some kinds of rotors to warp. Years ago, when I was doing absolute cr@ploads of motorway miles, having a warped disc was nearly a constant, with people loving to enter the motorway at 30kp/h and jumping directly to the overtaking lane and whatnot...

Jack the Stripper

A worn ball joint or lower arm bush etc can also give you brake judder.

CiniO

H3llR4iser wrote: »

Check tyres and balance; There's a very small chance it could be a tie rod end, but I'm afraid you may have a warped brake disc yet again.

Did you have to perform an emergency brake from higher speeds at any point after changing discs and pads? One "thermal shock" is all it takes to some kinds of rotors to warp. Years ago, when I was doing absolute cr@ploads of motorway miles, having a warped disc was nearly a constant, with people loving to enter the motorway at 30kp/h and jumping directly to the overtaking lane and whatnot...

Good quality discs won't warp just like that - maybe with exceptional circumstanced when you brake few times from 200km/h to 0 within short time and heat them up to red, and go straight into deep flood.
Even the best might have problem surviving that.

But in general, good quality discs, won't warp in normal driving.

Poor ones are like you described - one harsh braking, and they are gone.

H3llR4iser

CiniO wrote: »

Good quality discs won't warp just like that - maybe with exceptional circumstanced when you brake few times from 200km/h to 0 within short time and heat them up to red, and go straight into deep flood.
Even the best might have problem surviving that.

But in general, good quality discs, won't warp in normal driving.

Poor ones are like you described - one harsh braking, and they are gone.

Erhm...how to say...I *might* have been referring to something like the bolded part

I'm also talking about discs from the '90s at the time

RobAMerc

tires were moved from front to back for rotation. no other reason.
the disks and pads fitted were new

barneygumble99

RobAMerc wrote: »

tires were moved from front to back for rotation. no other reason.
the disks and pads fitted were new

What make of car is it??

RobAMerc

2013 BMW 520 d