[Mark e90]

As the title says i am getting a slight shudder when braking whenever I'm doing anything over 55mph, i Know its not a warped rotor as these were all replaced along with pads around 2k miles ago. Any ideas what this could be or any test i can do to try and diagnose this problem ? Thanks

[Abax335]

Anyway you can check rotor temps after hard braking see if you have a caliper sticking ?

How's the suspension specifically thrust rods? Are they leaking ? Control arm bushings ok?

What kind of pads and rotors did you use. Alot of those cheap kits online are pikes of shit especially when you drive the car hard.

[Mark e90]

It was pagid discs and pads from euro car parts, I will check the rotor temps next time I drive the car. iv had the car jacked up and had a pull at the wheel and track rod ends and doesn't seem to be play in anything or any leaks. whats the best way to check the control arms for play ?

[Abax335]

E9x is hands at 12 and 6 but can also test it like a tie rod at 3 and 9.

The thrust rods won't be a physically leak but have a black stain around the press in bushing

[Mark e90]

hmm that's they way I was pulling the wheel when checking. I will have another good look at it tomorrow. sticking calliper had crossed my mind but any time I have had a sticky calliper the wheel is always the give away as it's covered in brake dust but this isn't the case with any of my wheels this time.

[Aragorn30d]

Mine does this as well. I also sometimes get a similar vibration (though much more subtle) when simply driving along, usually at motorway speeds.

My disk temps are fine, nothings sticking or binding.

I recon its the front control arms from what others on here have said. Theres a few posts discussing similar things. Not got round to sorting them yet as i've been fixing the wifes car instead, and if i'm doing it, i'll end up replacing all the wearing parts on the front end such as top mounts, shocks etc.

[wallsmk2]

I would've thought if the thrust control arms are shot the judder wouldn't be specific to speed. Lower speeds, coming to a stop should also see movement. But then anything is possible. I would investigate the rotors and calipers first. Pagid are decent enough so I wouldn't suspect anything warped but I'd take it out for a run, check the wheels to see if one is warmer than the other and strip, clean and lubricate the caliper.

[djgandy]

Another Pagid problem thread. You're not the first person to have issues after 2000 miles and think that it can't be your discs or pads.

We were literally just discussing this yesterday. http://www.e90post.com/forums/showthread.php?t=1189876
There are plenty more threads too e.g. http://www.e90post.com/forums/showth...ighlight=Pagid

There is a good chance its your brakes, because it would appear that there is either a crap batch of Pagids lying around, and/or they are manufactured as cheaply as possible. So don't rule them out.

Consider this...
you can buy a set of 330mm pagid discs from ECP for £84 in VAT.
£14 of that goes to the government.
£70 is left to cover the cost of raw materials, manufacture, retailer margin, cost of business etc..

That's £35 per disc. That's not a lot for 10kg of iron, that will last 80,000 miles.

Put into context against other parts, brake discs are incredibly cheap anyway.

Next time if you don't go OEM, buy another brand and pay more. You can get a full set of discs and pads + sensor by Bosch for £180. It will save you headache!

[Mark e90]

Thats interesting however I'm pretty much sure its not the rotors as i had this problem from before i fitted the new discs and pads, it was one of the reasons i did and with the new discs the exact same problem still persisted not any better or worse. i have actually just bought the car back after selling it which is the reason I'm only now trying to get to the bottom of it

[Sparky68]

Track rod ends? Had similar on mine and replaced them this week cured it.

[Aragorn30d]

Originally Posted by djgandy

Another Pagid problem thread. You're not the first person to have issues after 2000 miles and think that it can't be your discs or pads.

We were literally just discussing this yesterday. http://www.e90post.com/forums/showthread.php?t=1189876
There are plenty more threads too e.g. http://www.e90post.com/forums/showth...ighlight=Pagid

There is a good chance its your brakes, because it would appear that there is either a crap batch of Pagids lying around, and/or they are manufactured as cheaply as possible. So don't rule them out.

Consider this...
you can buy a set of 330mm pagid discs from ECP for £84 in VAT.
£14 of that goes to the government.
£70 is left to cover the cost of raw materials, manufacture, retailer margin, cost of business etc..

That's £35 per disc. That's not a lot for 10kg of iron, that will last 80,000 miles.

Put into context against other parts, brake discs are incredibly cheap anyway.

Next time if you don't go OEM, buy another brand and pay more. You can get a full set of discs and pads + sensor by Bosch for £180. It will save you headache!

Mine arent pagid, and like the chap above, the issue was there before and is still there afterwards, exactly the same.

It felt like warped disks, and the parts on the car looked rough as, rear disks especially had huge grooves in them and only a tiny area of working brake pad, so i changed the lot. Brakes now feel much better, but the "warped disk" feeling is still there.

So clearly, its not the brakes, its something else.

[djgandy]

I assumed the OP was saying that this is a new symptom, not something he had before replacing his brakes.

If it was present before then it could be control arms. I have a slight twinge in the wheel when tapping the brake as the play in them doesn't keep the car as true as it should.

[Pencil]

Had mine in yesterday for front brakes and rotors because of steering wheel shimmy when brakes were applied. Turned out to be control arm bushings. Changing both sides cured the issue. Also seems to track truer. At highway speed I always felt the car wandered a little while holding the steering wheel straight. Cured that too. If you can get front wheels off ground, hit the tire with a hammer on the tread at 9:00 o'clock and watch and see if the whole wheel doesn't move east/west.

[Mark e90]

yeah I'm pretty much convinced its the control arm bushings, will get them looked at soon. if you dont mind me asking how much was it to have the bushes replaced ?

[Aragorn30d]

Fit the M3 control arms while your there.

The arms are around 50-60each, you need four.

[djgandy]

Originally Posted by Mark e90

yeah I'm pretty much convinced its the control arm bushings, will get them looked at soon. if you dont mind me asking how much was it to have the bushes replaced ?

It's probably wiser and similar price to replace the whole arms. You should be able to get TRW arms which are the OEM manufacturer for around £45 each.

Or go M3 arms which are similar price again and will tighten up the front a lot.

[essex_lad]

I had pagid rotors on my car from euro's and also had the same thing almost instantly and over time it got worse, I upgraded to black diamond performance rotors and they have been great but if you want a little cheaper OEM BMW rotors are best.