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Brakes & Suspension Forum sponsored by The Tire Rack |
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04-26-2021, 09:57 AM | #1 |
Scooby Specialist
Member#: 216459
Join Date: Jul 2009
Chapter/Region:
NESIC
Location: MA
Vehicle:2004 Sti wagon AW |
Swapping pads, should I turn my rotors?
I’m not sure if this has been posted for this type of situation but I’m gonna ask.
2004 wrx wagon/ sti swap. Track day coming up. I have brand new rotors with 2k on them with hawk hp5.0 pads. I’m switching to g-loc pads. Running their street pads for daily and for track swapping to r10s in back and 12s up front. Rotors are dba4000 t3 club spec rotors on hankook Rs4 r comp tires, stoptech 660 fluid, braided lines and a master cyl brace. G-loc recommended me turn my rotors for a fresh surface but the rotors are like new and I dont want to turn them and run the risk of them messing my rotors up. Is their anything I can do to clean my rotors for fresh pads I just want to make sure they bed properly. Thanks
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04-26-2021, 10:14 AM | #2 |
Scooby Specialist
Member#: 395793
Join Date: Jul 2014
Chapter/Region:
Tri-State
Location: SLC and Lake Placid
Vehicle:2005 92x Aero Beige |
I'd get them turned. Different pad compound from a different manufacturer. Who knows how they will interact. A fresh bed in is always safe.
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04-26-2021, 12:25 PM | #3 |
Scooby Specialist
Member#: 216459
Join Date: Jul 2009
Chapter/Region:
NESIC
Location: MA
Vehicle:2004 Sti wagon AW |
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04-26-2021, 12:48 PM | #4 |
Scooby Specialist
Member#: 395793
Join Date: Jul 2014
Chapter/Region:
Tri-State
Location: SLC and Lake Placid
Vehicle:2005 92x Aero Beige |
I don't use hawk pads so I can't say if the compounds from one of their pads to another will work together. Some companies do this with their pads. Some don't. Call hawk and ask.
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05-11-2021, 01:20 AM | #5 |
Scooby Specialist
Member#: 48377
Join Date: Nov 2003
Chapter/Region:
MWSOC
Location: "They eat fish soaked in lye"
Vehicle:1996 Gutted, built XP class Impreza L |
Yes- definitely get them turned. The pad compounds will be different enough as to interfere with each other, lessen performance, and shorten pad and rotor life. You would be best off with 1 set of pads and rotors for DD and a separate set for track day use. Rotors are not that expensive, just bag them in plastic with a coat of WD-40 between track days to keep them from rusting and they will last a long time.
Watch for cracks on the track day rotors though, as rotors can come apart under high stress sometimes. |
05-11-2021, 01:26 AM | #6 |
Scooby Specialist
Member#: 48377
Join Date: Nov 2003
Chapter/Region:
MWSOC
Location: "They eat fish soaked in lye"
Vehicle:1996 Gutted, built XP class Impreza L |
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05-11-2021, 07:22 AM | #7 |
Scooby Specialist
Member#: 498642
Join Date: Mar 2019
Chapter/Region:
Tri-State
Location: our wrx IS the family sedan
Vehicle:'19 WRX Ltd 6M dgm '08 Mustang GT (the toy) |
Turn them. Given that your rotors are slotted it may be better to have this done by grinding rather than cutting with standard brake lathe tool bits.
Hawk pads in HP+ and up tend to be rather abrasive in lower stress, lower-temperature street duty. G-Locs or Carbotechs at least up to '12' are much kinder to your rotors. Norm |
05-11-2021, 08:13 AM | #8 |
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region:
South East
Location: Down yonder.
Vehicle:2016 Fuji Sunfire 03 Silver |
If you are swapping pads back and forth for track days I would suggest getting another set of rotors and marking rotors and pads as sets so each set stays matched for location and inner/outer.
Brake pads and rotors have a process called "seating" where they mate together. Arbitrarily moving positions and swapping pads disrupts that process and will definitely affect braking performance and balance. |
05-11-2021, 10:23 AM | #9 |
Scooby Newbie
Member#: 511269
Join Date: Feb 2020
Location: Savannah, GA
Vehicle:2017 WRX |
Yes, you should get the rotors resurfaced.
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05-13-2021, 02:21 PM | #10 |
Scooby Guru
Member#: 120
Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
Turning rotors is a waste of useful rotor life and your time and money. Get a Scotchbrite disk for your drill, scuff the faces of the rotors to break up the existing pad transfer layer, bed the new pads in, good to go. I've never had an issue with this method, including shifting from street to track pads. I haven't turned a set of rotors for any of my cars in at least 15 years, probably close to 20.
With that said, I concur with the others who recommended just buying a 2nd set of rotors to install with your track pads. |
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