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Shaking steering when braking
- Fanatic
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Shaking steering when braking
My 04' Z has 83.000km
I have new rotors and brake pads (3000km) and overhauled calipers because I upgraded everything to 3,0si specs front and back. I bedded the brakes according to instructions.
When I am driving at high speeds >130-140km/hour and slow down by braking I can feel a tremble in the steering wheel. I cannot feel it when braking hard to a stand still or at slower speeds when braking for example at a traffic light. Recent MOT did not show any braking inconsistency but of course their tests are at lower speeds.
Any ideas??
I have new rotors and brake pads (3000km) and overhauled calipers because I upgraded everything to 3,0si specs front and back. I bedded the brakes according to instructions.
When I am driving at high speeds >130-140km/hour and slow down by braking I can feel a tremble in the steering wheel. I cannot feel it when braking hard to a stand still or at slower speeds when braking for example at a traffic light. Recent MOT did not show any braking inconsistency but of course their tests are at lower speeds.
Any ideas??
04' Z4 2.5i Maldives Blue - 108 alloys - Hardtop - 3,0si brakes F/R, BMW sport stubby, K&N filter, chrome exhaust tips, ZHP shift knob, cruise control, sound generator, twin clear reverse light, led dome light and footwell lights.
- pvr
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Shaking steering when braking
Generally, I would look at warped disks but as they are new perhaps less likely.
When were the wheels last balanced?
When were the wheels last balanced?
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- buzyg
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Shaking steering when braking
Have you changed any tyres recently. Could be a wheel imbalance, at it's as particular speeds.
- Smartbear
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Shaking steering when braking
Mine exhibited the same behaviour & it was worn lollipop bushes
Rob
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
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Shaking steering when braking
I cannot think how 325mm discs could get warped without any track day use. I have not even put much pressure on them since replaced.pvr wrote:Generally, I would look at warped disks but as they are new perhaps less likely.
When were the wheels last balanced?
Tires were balanced and alignment was done about three months ago.
Last edited by Fanatic on Sun Jan 15, 2017 6:35 pm, edited 1 time in total.
04' Z4 2.5i Maldives Blue - 108 alloys - Hardtop - 3,0si brakes F/R, BMW sport stubby, K&N filter, chrome exhaust tips, ZHP shift knob, cruise control, sound generator, twin clear reverse light, led dome light and footwell lights.
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Shaking steering when braking
Smartbear wrote:Mine exhibited the same behaviour & it was worn lollipop bushes
Rob
This sounds worth checking. Did they visually look worn?
04' Z4 2.5i Maldives Blue - 108 alloys - Hardtop - 3,0si brakes F/R, BMW sport stubby, K&N filter, chrome exhaust tips, ZHP shift knob, cruise control, sound generator, twin clear reverse light, led dome light and footwell lights.
- Smartbear
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- Location: a barn in Somerset
Shaking steering when braking
Still looked ok but had developed some slop, I replaced with mehley hd replacement bushes which were not oil damped but have a good reputation for lasting wellFanatic wrote:Smartbear wrote:Mine exhibited the same behaviour & it was worn lollipop bushes
Rob
This sounds worth checking. Did they visually look worn?
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold
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Shaking steering when braking
Just remembered I had one of them changed a few months ago. :/ Maybe the other one needs replacing also.Smartbear wrote:Still looked ok but had developed some slop, I replaced with mehley hd replacement bushes which were not oil damped but have a good reputation for lasting wellFanatic wrote:Smartbear wrote:Mine exhibited the same behaviour & it was worn lollipop bushes
Rob
This sounds worth checking. Did they visually look worn?
Rob
Or do they go in pairs? Not sure.
04' Z4 2.5i Maldives Blue - 108 alloys - Hardtop - 3,0si brakes F/R, BMW sport stubby, K&N filter, chrome exhaust tips, ZHP shift knob, cruise control, sound generator, twin clear reverse light, led dome light and footwell lights.
- mattyp
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Shaking steering when braking
Same for me also. I would be looking at suspension bushes.Smartbear wrote:Mine exhibited the same behaviour & it was worn lollipop bushes
Rob
E86 2007 Monaco Blue Metallic 3.0 Si SE with Beige Heated Leather
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Shaking steering when braking
Most likely the lollipops - proper name brake reaction bushings. You could consider poly for these.
Brake discs really don't warp, but I'm not going to get into that.
Brake discs really don't warp, but I'm not going to get into that.
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.
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Shaking steering when braking
Scooba_Steve wrote:Most likely the lollipops - proper name brake reaction bushings. You could consider poly for these.
Brake discs really don't warp, but I'm not going to get into that.
Number 8??
These are a few months old on mine. Original BMW
http://bmwfans.info/parts-catalog/E85/E ... _wishbone/
I would also appreciate reading why rotors don't warp?
04' Z4 2.5i Maldives Blue - 108 alloys - Hardtop - 3,0si brakes F/R, BMW sport stubby, K&N filter, chrome exhaust tips, ZHP shift knob, cruise control, sound generator, twin clear reverse light, led dome light and footwell lights.
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- Lifer
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Shaking steering when braking
Yes, so if both of those are new you could have worn arms (at 6 and/or 7) which you can check by trying to rock the wheel.
Next could be what would normally be termed warped discs. They won't actually be warped but the usual cure when paying is to replace due to labour costs. You could have them skimmed if you remove them yourself but deposits can return if not enough is removed and/or if there is any runout.
Next could be what would normally be termed warped discs. They won't actually be warped but the usual cure when paying is to replace due to labour costs. You could have them skimmed if you remove them yourself but deposits can return if not enough is removed and/or if there is any runout.
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.
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Shaking steering when braking
But my discs are new. Is it possible that new discs can have this problem?Scooba_Steve wrote:Yes, so if both of those are new you could have worn arms (at 6 and/or 7) which you can check by trying to rock the wheel.
Next could be what would normally be termed warped discs. They won't actually be warped but the usual cure when paying is to replace due to labour costs. You could have them skimmed if you remove them yourself but deposits can return if not enough is removed and/or if there is any runout.
04' Z4 2.5i Maldives Blue - 108 alloys - Hardtop - 3,0si brakes F/R, BMW sport stubby, K&N filter, chrome exhaust tips, ZHP shift knob, cruise control, sound generator, twin clear reverse light, led dome light and footwell lights.
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- Lifer
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- Location: NW London
Shaking steering when braking
If they were installed with runout yes, but given the age of the cars I'd expect bushings to be failing - check the front control arms or get someone to do it as the first step.
3.0si Sport: F10 Illuminated ZHP, Retrofit Cruise, OE Stubby, Gaptech RCH+, Kenwood BT73DAB + Handsfree, HIDs, LED Sidelights, OE LED Number Plate Lights, Custom LED strip bootlight.