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Judder when breaking

birdy_z4
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Judder when breaking

Post by birdy_z4 » Wed Jan 19, 2022 4:38 pm

Hi All

Had the z4 out on the motorway today

All good apart from a judder when breaking at 50 plus

Anyone any thought?

Brake pads look ok

Could it be flat spots on the discs?

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enuff_zed
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Judder when breaking

Post by enuff_zed » Wed Jan 19, 2022 4:42 pm

birdy_z4 wrote: Wed Jan 19, 2022 4:38 pm Hi All

Had the z4 out on the motorway today

All good apart from a judder when breaking at 50 plus

Anyone any thought?

Brake pads look ok

Could it be flat spots on the discs?
Feel the wheels after a decent drive. If one is hotter then you have a binding brake calliper.
But I'd expect that to be apparent at lower speeds too.
So other things to look at include wheels properly balanced, tyre pressures correct, worn suspension bushes.
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Judder when breaking

Post by Spriteracer » Wed Jan 19, 2022 5:37 pm

A bit of an extreme case, but last year I had serious judder which turned out to be the friction material detached from the pad backing plate on a nearly new pad.

Also if it helps, years ago my dad had a first generation 7 series and the handbook said you should do several hard stops now and again to maintain the disks and remove any glazing etc. that can occur with gentle use over a period. I guess that is less likely with a Z but it can't hurt !
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Judder when breaking

Post by buzyg » Wed Jan 19, 2022 6:55 pm

I think enuff Zed has it covered. Possibly worn tyres is another to consider.
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Judder when breaking

Post by Gwest44 » Wed Jan 19, 2022 7:04 pm

I had this when I had the Z4MC and it turned out to be warrped discs - apparently a common issue on the Z4MC.

Ended up fitting 4 new discs which sorted it - but can't say as I have heard that this is an affliction affecting the E89.
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birdy_z4
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Judder when breaking

Post by birdy_z4 » Wed Jan 19, 2022 7:30 pm

Thanks all for feedback and suggestions

Balance is ok and perfect the issue only apparent when braking, i will have to get the wheels off to check. The car had new pads fitted when I bought the car.

Doesn’t feel to be pulling when braking which I would expect if front calliper seizing up

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Judder when breaking

Post by Pondrew » Wed Jan 19, 2022 9:59 pm

Judder when breaking what?
I judder when I'm breaking concrete.
When braking, it never happens :poke:
HTH :thumbsup:
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Judder when breaking

Post by Deepseaskateboard » Wed Jan 19, 2022 10:15 pm

birdy_z4 wrote: Wed Jan 19, 2022 4:38 pm Hi All

Had the z4 out on the motorway today

All good apart from a judder when breaking at 50 plus

Anyone any thought?

Brake pads look ok

Could it be flat spots on the discs?
This happened to me when driving it down the motorway after the lockdown. Essentially, the disks and pads are probably due for a replacement.

I had mine changed and the problem went away.

Euro car parts often have 50% off campaigns on brakes.

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Judder when breaking

Post by mcbutler » Wed Jan 19, 2022 10:52 pm

Take it out again and recreate the problem, as you are braking release your grip on the steering wheel so you are holding it very lightly.
If the wheel is twitching left and right as you experience the judder then you have warped discs.

In regard to a binding brake you will smell that after a long fast drive, generally a sour acidic smell.

You can test the brakes for binding by driving at around 5 mph on a flat surface, put the car in neutral and allow it to roll to a complete stop. The car should roll smoothly and gently to a stop, any sort of sticking at the moment the car stops indicates a tight brake.
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birdy_z4
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Judder when breaking

Post by birdy_z4 » Thu Jan 20, 2022 9:10 am

Pondrew wrote: Wed Jan 19, 2022 9:59 pm Judder when breaking what?
I judder when I'm breaking concrete.
When braking, it never happens :poke:
HTH :thumbsup:
Oops better get the dictionary out lol :oops:

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Judder when breaking

Post by birdy_z4 » Fri Jan 21, 2022 8:29 am

Ok so looking on sites how do I know the size of discs for the front

There seems to be 2 sizes for e89 3.0i s, 330 & 300

Also if I have to change the discs was thinking of upgrading but not big brake kits and not a fortune.

Any suggestions drilled, grooved etc

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Judder when breaking

Post by dhobbs » Fri Jan 21, 2022 10:06 am

I have a judder on my front wheels. Initial thought was warped discs but turned out was the pads or more specifically the metal plate. The outer ears of the plate had started to rust and stick to the caliper so they were not free to move. But if a file and copper grease on the mating points and all is fine.
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Judder when breaking

Post by birdy_z4 » Fri Jan 21, 2022 3:51 pm

Thanks for the tip will check this weekend if I can brave the cold

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Judder when breaking

Post by enuff_zed » Fri Jan 21, 2022 4:18 pm

birdy_z4 wrote: Fri Jan 21, 2022 3:51 pm Thanks for the tip will check this weekend if I can brave the cold
Give it a long run with lots of heavy braking. Then at least your hands will be warm. :D
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Judder when breaking

Post by Roberltd2 » Fri Jan 21, 2022 4:56 pm

Worn rear lower wishbone bushes possibly. I think that's what I the spanner man replaced on mine when it started juddering under braking. Totally cured the problem.
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