Intermittant Brake Judder

cchidzey · Feb 5th, 2020, 10:28

This has been driving me mad for months now.
Car usually drives fine, but every now and again I get a bad brake judder when braking. Exactly like a cracked/warped disc.
The odd thing is it's intermittant, doesn't do it all the time.
Calipers all free with free sliders and clean grease in the bellows.
Discs and pads, fairly new (genuine), no obvious faults.
Handbrake shoes and springs all OK (genuine, manual adjusters fitted).
Pad spring clips are fitted correctly.
Caliper bolts tight.
Wheel bearings all OK.
CV joints appear to be OK.
Tracking OK.
When it's been vibrating, the car rolls freely on a gentle slope, no heat being generated.

It's definately braking related, only does it when braking, and can be absolutely perfect or quite violent, with no real conditions differing.
Perhaps it's slightly worse gouing downhill but that's maybe just coincidence.

Anyone come across this before? I really don't want to start changing parts trying to find the fault.

05XC90 · Feb 5th, 2020, 10:50

ABS sensor or sensor ring dirty/corroded??

TruckbusUK · Feb 5th, 2020, 10:59

Check the front wishbone bushes ... if it only happens intermittently then it could be one of the bushes ... I had it happen to me ... took several attempts to identify what was happening, bushes changed and all ok ... worth checking.

Hope it helps

gmonag · Feb 5th, 2020, 14:41

Yes, wishbones.

cchidzey · Feb 7th, 2020, 16:45

Thanks guys, the front suspension is pretty 'loose' so wishbones makes sense.
Will check and report back

Feb 5th, 2020, 10:28	#1
cchidzey Junior Member Last Online: Apr 25th, 2023 02:23 Join Date: Jan 2016 Location: Darlington	Intermittant Brake Judder This has been driving me mad for months now. Car usually drives fine, but every now and again I get a bad brake judder when braking. Exactly like a cracked/warped disc. The odd thing is it's intermittant, doesn't do it all the time. Calipers all free with free sliders and clean grease in the bellows. Discs and pads, fairly new (genuine), no obvious faults. Handbrake shoes and springs all OK (genuine, manual adjusters fitted). Pad spring clips are fitted correctly. Caliper bolts tight. Wheel bearings all OK. CV joints appear to be OK. Tracking OK. When it's been vibrating, the car rolls freely on a gentle slope, no heat being generated. It's definately braking related, only does it when braking, and can be absolutely perfect or quite violent, with no real conditions differing. Perhaps it's slightly worse gouing downhill but that's maybe just coincidence. Anyone come across this before? I really don't want to start changing parts trying to find the fault.

Feb 5th, 2020, 10:59	#3
TruckbusUK Petrolhead+Lots of Diesel Last Online: Today 11:43 Join Date: Aug 2008 Location: Glasgow	Check the front wishbone bushes ... if it only happens intermittently then it could be one of the bushes ... I had it happen to me ... took several attempts to identify what was happening, bushes changed and all ok ... worth checking. Hope it helps __________________ BMW X3 Msport MHEV 2020MY & VW Beetle Design 1.2Tsi DSG 2014MY Previous XC90 D5 SELux Geartronic 2009MY

Feb 5th, 2020, 14:41	#4
gmonag Premier Member Last Online: Jan 15th, 2024 17:24 Join Date: Jun 2010 Location: Bury St Edmunds	Yes, wishbones. __________________ Greg

Feb 5th, 2020, 10:50	#2
05XC90 Member Last Online: Aug 19th, 2023 20:56 Join Date: Aug 2017 Location: Belfast	ABS sensor or sensor ring dirty/corroded??

Feb 7th, 2020, 16:45	#5
cchidzey Junior Member Last Online: Apr 25th, 2023 02:23 Join Date: Jan 2016 Location: Darlington	Thanks guys, the front suspension is pretty 'loose' so wishbones makes sense. Will check and report back

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