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Custom User Title
Join Date: Oct 2002
Location: Miami
Posts: 4,294
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how to detect which rotors are warped
So I've known for some time that at least one of my rotors is moderately warped. Symptoms were vibration on braking that got more intense with more speed. Nothing so bad it would be dangerous (yet), but obviously needs to be resolved.
So I will have to replace the offending rotor(s). I am pretty sure I need to replace in pairs, so I will have at least 2 rotors to buy, and if at least one front and one back is gone, then I need 4! I already bought 4 brake pads, but I read that I should pair new pads with new rotors so I am waiting on installing the pads. So... the purpose of the post? I need someone to tell me how to tell which rotor is warped? And then, for bonus points, you could tell me if I should go OEM, or suggest something else. |
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02-04-2004, 12:59 PM
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Feelin' Solexy
Join Date: Oct 2003
Location: WA
Posts: 3,788
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Use a "true bar", basically a well machined piece of steel about as big around and as long as your pinky.....you put the bar on the surface, and see if you can see light underneath it.
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Grant In the stable: 1938 Buick Special model 41, 1963 Solex 2200, 1973 Vespa Primavera 125, 1974 Vespa Rally 200, 1986 VW Vanagon Syncro Westfalia, 1989 VW Doka Tristar, 2011 Pursuit 315 OS, 2022 Tesla Y Gone but not forgotten: 1973 VW Beetle, 1989 Porsche 944, 2008 R56 Mini Cooper S |
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02-04-2004, 01:09 PM
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Registered
Join Date: Dec 2002
Location: St. Petersburg, Florida
Posts: 1,990
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Seems like a good place for a T-square..
....but....I think my rotors have an unused "rim" around them.
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83 944 white w/Boxster wheels Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
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02-04-2004, 03:29 PM
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Registered
Join Date: Sep 2002
Location: N. California
Posts: 341
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The emergency brake is at the back, right? So when its safe put the emergency brake on GENTLY and if its the back rotors it should judder - no juddering and its only the fronts.
Mark
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1991 944 S2 (no more, sold it, gone to a good home) 2003 Infiniti G35 Coupe, 280hp, Black |
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02-04-2004, 03:55 PM
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Registered
Join Date: Oct 2002
Location: Palm Bay, Florida
Posts: 317
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Clamp a dial indicator to the caliper and spin the rotor. Just get a cheap dial indicator @ Harbor freight and a big c clamp. You will need a mounting bar extension for the indicator.
Rick
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'83 944 "Guards Red" New Everything (seems like) 16" 968 Wheels has never left garage (yet) |
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02-04-2004, 04:43 PM
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Registered
Join Date: Mar 2003
Location: dfw, texas
Posts: 1,137
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won't a brake place or an alignment shop tell you for free?
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84 944 Non Alcoholic |
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02-04-2004, 08:29 PM
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