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Old 08-29-2003, 01:00 AM   #1
Scooby Specialist
Member#: 5673
Join Date: Apr 2001
Location: Folsom, CA
16 Hellcat
05 LGT, 02 bug eye

Default turning slotted and drilled dba rotors

Is there anything special I need to tell the shop to do when turning drilled and slotted DBA rotors?
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Old 08-29-2003, 07:36 PM   #2
Scooby Specialist
Member#: 14848
Join Date: Jan 2002
Location: Philadelphia
2007 Tribeca
TS w/ 20" OZ's


Yeah, you can't turn them. Buy new ones.
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Old 08-29-2003, 11:32 PM   #3
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Member#: 17332
Join Date: Apr 2002
Chapter/Region: NESIC
Location: The neighbor's yard
2004 Black STI
Not stock anymore


are you sure? Other companies tell you it's ok, just take a minimal amount.
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Old 08-30-2003, 08:36 PM   #4
Scooby Newbie
Member#: 39218
Join Date: Jul 2003
Location: California
2004 WRX Aspen White


every rotor should have a minimum thickness that can be safely acheived weither it be slotted or crossdrilled, you can get this info from the manufacturer. now once a rotor is warped you can resurface it but it's never really the same, and a resurfaced rotor will always warp faster than a new one. you see race teams resurfacing rotors but its not becuase theyre warped to the point where they vibrate, theyre doing this to maintain a flat surface for the brake pad to stop on, because theyre using new pads. hope that helped.
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Old 08-31-2003, 05:59 PM   #5
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Member#: 22462
Join Date: Aug 2002
Chapter/Region: SWIC
Location: Phoenix , Az
2001 AutoFozzyFTW


I have the same rotors on the front of my 00 impreza RS I had to take mine to a machine shop for turning . I would trust a machine shop before a auto parts or brake shop . Remember auto parts stores are in the buisness of selling parts .
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Old 08-31-2003, 06:32 PM   #6
Steppin Razor
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Member#: 24035
Join Date: Sep 2002
Chapter/Region: BAIC
Location: San Francisco
2002 GGA 5MT
Seal Gray


how many times do i have to say it before people understand that BRAKE ROTORS DO NOT WARP!!!

the reason that drillled rotors are more prone to breaking is that unless the holes are chamfered and stress relieved is that the sharp edge left by the drilling creates "hot spots" where the rotor will become hotter than the rest of the rotor and this increased heat cycling weakens the iron alloy.

even IF you were using properly made drilled rotors, by machining them, you would be recreating the sharp edges on each hole and thus greatly increasing the chances of your rotor cracking. unless you went back and rechamfered each hole and then stress relieved the rotors again. but then you'd be wasting your money because drilled rotors are for tools anyway.
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