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#1
12-01-2013, 12:37 AM
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How to properly test if rotors are warped?
I've been getting some apparent high speed brake "jutters". I've recently installed Brembo drilled rotors and EBC red stuff pads. I believe it is mostly coming from front driver side. Does anyone know a way to properly and accurately test for warped rotors? I've also read while searching to change ball joints... I'll be checking around for more info on this as well. Had the new brakes on for a couple thousand miles if that would make a difference in diagnosing the issue. Brembo and EBC installed on the front only.
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2004 E53 X5 4.4i 
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#2
12-01-2013, 01:03 AM
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You need to get some M12 x 1.5 bolts long enough to clamp the rotor to the hub (but not too long!). Then get a dial indicator and a stand to hold it on. Zero it out against the rotor and slowly turn the rotor while watching the dial indicator.
My bet, however, is that the discs and pads haven't been bedded well and you are feeling uneven pad deposits and you don't have warped rotors.
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Kirk Las Vegas 2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo 2011 E90M3, 6-speed manual
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#3
12-01-2013, 01:13 AM
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Thanks for the info! I followed some general bedding techniques when I first installed them. I had no issues at first...
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2004 E53 X5 4.4i
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#4
12-01-2013, 01:16 AM
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Hopefully, you torqued the wheel lugs down properly (140Nm, 100 ft. lbs). Overtorquing can cause problems like you describe.
However, it may be that your thrust arm bushings are going bad. Do you feel any vibration w/o the brakes at around 55mph or higher? That's one sign of the bushings going bad.
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Kirk Las Vegas 2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo 2011 E90M3, 6-speed manual
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#5
12-01-2013, 07:39 AM
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Hi-speed jutter at braking could also be your thrush arm bushings.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#6
12-01-2013, 10:04 AM
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Now that you say that, I do getsome slight vibrations at around 35 mph when city driving. Occasionally I must add, not all the time. Hopefuly it isn't the rotors, but from now on only oem.
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2004 E53 X5 4.4i
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#7
12-01-2013, 11:39 AM
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I highly doubt the rotors are warped. It is nearly impossible to do so on a street driven car.
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Current Bimmer 2004 X5 4.4i Sterling Grey Sport/Premium Past Bimmers 1991 318I Alpine White 1995 740I Alpine White 1991 525I Schwartz 1998 323IS Scwartz 2004 330CI Cabrio Titanium Silver Metallic 1995 540I Schwartz 2000 Z4 3.0 Titanium Silver 2000 330ci Coupe Titanium Silver
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