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#1
01-04-2023, 09:28 PM
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Brake shudder question - solved
Checking in with the brains-trust here - I have a brake shudder that is proving tricky to diagnose.
Light shuddering under brakes ONLY when at high speed (~100km/h) AND downhill. Braking from high speed on the flat or uphill - smooth as silk. Braking from low speeds (~50km/h) on flat or downhill - smooth as silk, no discernable shudder. not much (if any) shudder felt through brake pedal - only through steering wheel and ears (very audible!). Front control arm (tension strut) bushes are good, so I'm thinking it could be the lower control arms or the tension strut ball joints? Tempted to replace rotors to eliminate them but that is the priming of the parts cannon...  At 270,000kms, the (original) lower control arms and tension strut ball joints are likley done anyway but there are no other symptoms that indicate these components need replacing. They are VERY expensive here so I'm not going to simply replace them "on spec".  *edit* tldr; turned out to be rotors - replaced with new Brembo rotors and all good again.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) 
Last edited by wpoll; 01-22-2023 at 02:52 PM. 
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#4
01-05-2023, 11:13 AM
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I had exactly the same problem on mine. Brake shudder at high speed but smooth at mid-low speed.
It went away after I replaced 31122180422 and had a four wheel alignment. Unfortunately I did them both at the same time so couldn't tell you which one fixed the shudder!  I'd assume the arms.
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2006 X5 3.0D
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#5
01-05-2023, 12:57 PM
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at 200K every suspension part is worn out beyond its service life. Replace them all.
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 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#6
01-05-2023, 04:31 PM
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X2 on rotors. After a complete front rebuild, mine still had shudder under hard load. Did a complete front and rear rotor/pad replacement. Stops like a Porsche.
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'06 X5 3.0i - bought @143,123 miles (12/26/20)
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#7
01-06-2023, 03:13 PM
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No cupping on tyres.
Have ordered new Brembo rotors - will start there then progress to front control arm ball joints then lower control arms... Boom..
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01)
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#8
01-06-2023, 03:16 PM
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Have you ever replaced the tension strut bushings? just because they look ok doesn't mean they are ok.
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2011 M3 2006 Sierra 2500HD 4WD LBZ/Allison 2004 X5 3.0i 6MT 1995 M3 S50B32 1990 325is 1989 M3 S54B32 Hers: 1989 325iX 1996 911 Turbo 
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#9
01-06-2023, 03:22 PM
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Quote:
They are easy to diagnose - clunking when you dab the brake at very slow speeds.
__________________
Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01)
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