Brake Judder

[aescilus]

Hi

I have a e90 320d and my brakes judder when pressed, it doesnt matter what speed I am going they do it. I have had the car for about 6 months now and have had an MOT & Service done without them noticing anything, it's been doing this since the purchase.

Aesc

[boro92]

Uneven pad deposits. Two solutions: machine the rotors (you can do this with a rotor hone tool connected to a drill--search for this on Amazon), or get them turned on a lathe. Alternatively you can buy new rotors.

It's common. Problem is that if you have uneven pad deposits under normal driving, it may suggest a sticky caliper (read: dragging brake pad). Make sure it is not a caliper problem before u solve the rotor, or it will eventually judder again

[jclausen]

Or you don't have factory brakes installed, meaning real BMW pads and rotors. If you have aftermarket brake parts and they could have warped, which in turn could wear out your thrust rod bushings

[aescilus]

From what I can gather, the discs were replaced on the last full service (30k miles ago and was not from BMW) , after an inspection I had a few weeks ago the BMW specialist said there were "heat spots" on the discs? As said over past few weeks the car has had a MOT and Interim service so nothing was picked up on those.

[boro92]

From what I can gather, the discs were replaced on the last full service (30k miles ago and was not from BMW) , after an inspection I had a few weeks ago the BMW specialist said there were "heat spots" on the discs? As said over past few weeks the car has had a MOT and Interim service so nothing was picked up on those.

Right. The heat spots confirm uneven pad deposits. Rotors do not warp. They are over 1 inch thick rounds of iron :) the judder you feel is the uneven pad transfer layer on the face of the rotors. This can be machined off. It is a common occurrence when brakes are abused, over heated or faded. Stop tech has a white paper on this very thing. Google it. This occurs regardless of the quality of rotor.

[aescilus]

Phew! Well in that case would you just recommend I change the discs and pads and if so what ones are best? I will be remapping the car over the coming months so I think performance brakes would definitely come in hand. Thank you

[MassiveWalrus]

Uneven pad deposits. Two solutions: machine the rotors (you can do this with a rotor hone tool connected to a drill--search for this on Amazon), or get them turned on a lathe. Alternatively you can buy new rotors.

It's common. Problem is that if you have uneven pad deposits under normal driving, it may suggest a sticky caliper (read: dragging brake pad). Make sure it is not a caliper problem before u solve the rotor, or it will eventually judder again
+1


Or you don't have factory brakes installed, meaning real BMW pads and rotors. If you have aftermarket brake parts and they could have warped, which in turn could wear out your thrust rod bushings

poppycock


Right. The heat spots confirm uneven pad deposits. Rotors do not warp. They are over 1 inch thick rounds of iron :) the judder you feel is the uneven pad transfer layer on the face of the rotors. This can be machined off. It is a common occurrence when brakes are abused, over heated or faded. Stop tech has a white paper on this very thing. Google it. This occurs regardless of the quality of rotor.

+1 http://www.stoptech.com/technical-support/technical-white-papers/-warped-brake-disc-and-other-myths


Phew! Well in that case would you just recommend I change the discs and pads and if so what ones are best? I will be remapping the car over the coming months so I think performance brakes would definitely come in hand. Thank you

Best bang for your buck is any after market high carbon Coated rotor... here are some that i have used many a times in the past on my DD 335i, E46 and track rat E36M3

Meyle UV high carbon rotors

Zimmermann coat Z

Centric / Stoptech High Carbon rotors

As for pads you can use any OES pads by Pagid, Textar, Jurid etc... or you can use an after market Ceramic pad... less dust but your pedal will not have the "OE" Grab & feeling IMHO

[aescilus]

Thanks! What do you make of these? Seems like a pretty good deal to me? http://www.ebay.co.uk/itm/2X-ZIMMERMANN-SPORT-BRAKE-DISC-300-PADS-BMW-3-SERIES-E90-E91-316-325-E92-325-/371592950266?hash=item5684aa71fa:g:AREAAOSwZ8ZXA50 C#vi-ilComp (http://www.ebay.co.uk/itm/2X-ZIMMERMANN-SPORT-BRAKE-DISC-300-PADS-BMW-3-SERIES-E90-E91-316-325-E92-325-/371592950266?hash=item5684aa71fa:g:AREAAOSwZ8ZXA50 C#vi-ilComp)

[MassiveWalrus]

those are cross drilled... get blanks

[jclausen]

The best brake parts for general driving with great pedal feel in rain, cold, hot weather are factory BMW parts, but they do produce abit of dust

[MassiveWalrus]

Sure.

[aescilus]

These ones are only dimpled not cross drilled which I like! http://www.ebay.co.uk/itm/351340930854?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Also I want to add that I checked all my discs today and none of them have the heat/dark patches on them as shown in the picture, could the deposits be on the pads themselves?

[MassiveWalrus]

These ones are only dimpled not cross drilled which I like! http://www.ebay.co.uk/itm/351340930854?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Also I want to add that I checked all my discs today and none of them have the heat/dark patches on them as shown in the picture, could the deposits be on the pads themselves?

You should check the run out on your rotor.

[aescilus]

What do you mean by run out?

[MassiveWalrus]

https://www.youtube.com/watch?v=t_IZzyQcBPA