when to replace brake rotors?
Jun 22, 2012, 10:27 AM
#1
when to replace brake rotors?
Hey guys,
I currently run PF 2-piece rotors that have probably around 20 days on them. I have stress cracks and I know I'm getting close to the end of their serviceable life.
When are you guys replacing your rotors? what criteria are you using to gauge lifespan?
I currently run PF 2-piece rotors that have probably around 20 days on them. I have stress cracks and I know I'm getting close to the end of their serviceable life.
When are you guys replacing your rotors? what criteria are you using to gauge lifespan?
Jun 22, 2012, 11:12 AM
#2
What tires - size and compound - do you run?
That'll help us gauge how hard you push the car as everyone wears items at different rates. Personally I always error to the side of caution with things like rotors. I'll replace them at about the rates of a set of pads - maybe 2 sets of pads max. It all depends on how they look.
The spider cracks happen. They're worse when you do things like TT where you run the car hard right at the start of the session from lap #1 - and repeat that 4-5x in a day. Those quick heat-ups and cool-downs are killer (but part of racing).
If you have any of the cracks line up with a slot and/or work to the edge - replace ASAP. Once I've had them on for a few events I start checking them every session. Be careful though, last event I had a huge 2" crack and I didn't see it initially (was hiding behind the rotor) until I pulled the tire off to check something else!
That'll help us gauge how hard you push the car as everyone wears items at different rates. Personally I always error to the side of caution with things like rotors. I'll replace them at about the rates of a set of pads - maybe 2 sets of pads max. It all depends on how they look.
The spider cracks happen. They're worse when you do things like TT where you run the car hard right at the start of the session from lap #1 - and repeat that 4-5x in a day. Those quick heat-ups and cool-downs are killer (but part of racing).
If you have any of the cracks line up with a slot and/or work to the edge - replace ASAP. Once I've had them on for a few events I start checking them every session. Be careful though, last event I had a huge 2" crack and I didn't see it initially (was hiding behind the rotor) until I pulled the tire off to check something else!
Jun 22, 2012, 11:20 AM
#3
What tires - size and compound - do you run?
That'll help us gauge how hard you push the car as everyone wears items at different rates. Personally I always error to the side of caution with things like rotors. I'll replace them at about the rates of a set of pads - maybe 2 sets of pads max. It all depends on how they look.
The spider cracks happen. They're worse when you do things like TT where you run the car hard right at the start of the session from lap #1 - and repeat that 4-5x in a day. Those quick heat-ups and cool-downs are killer (but part of racing).
If you have any of the cracks line up with a slot and/or work to the edge - replace ASAP. Once I've had them on for a few events I start checking them every session. Be careful though, last event I had a huge 2" crack and I didn't see it initially (was hiding behind the rotor) until I pulled the tire off to check something else!
That'll help us gauge how hard you push the car as everyone wears items at different rates. Personally I always error to the side of caution with things like rotors. I'll replace them at about the rates of a set of pads - maybe 2 sets of pads max. It all depends on how they look.
The spider cracks happen. They're worse when you do things like TT where you run the car hard right at the start of the session from lap #1 - and repeat that 4-5x in a day. Those quick heat-ups and cool-downs are killer (but part of racing).
If you have any of the cracks line up with a slot and/or work to the edge - replace ASAP. Once I've had them on for a few events I start checking them every session. Be careful though, last event I had a huge 2" crack and I didn't see it initially (was hiding behind the rotor) until I pulled the tire off to check something else!
i have spider cracks and i have been checking them every session as of late. the cracks are about to the point where i can catch them with my fingernail.
ill see if i can get a pic later
Jun 22, 2012, 12:05 PM
#4
^^ Then I'd go with a similar replacement schedule I do; figure 2-3 sets of pads. If any of them get thick enough where you can catch a fingernail in them, I'd say they're done with. I always error on the side of safety with rotors... When in doubt; change them out.
Jun 22, 2012, 03:34 PM
#5
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^^^Always a good idea to always replace early and often. That being said, you can get quite a bit of track abuse out of a set of rotors if they are properly designed (and appropriately priced). I got dozens of track days out of my set of Racing Brake 2 piece rotors. I wore them down so far that the slots began to fade away. Spider cracks will inevitably happen. As mentioned earlier, they aren't a worry until the propagate to the edges or you can feel them with your nail.
Here is one of my rotors when I replaced them.
Here is one of my rotors when I replaced them.
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Jun 28, 2012, 04:51 AM
#8
i haven't worn through the dimples yet
I went ahead and ordered new discs. cheapest place I found was www.rotorsandpads.com for ~430 shipped. got the rotors the next day
I went ahead and ordered new discs. cheapest place I found was www.rotorsandpads.com for ~430 shipped. got the rotors the next day
Jun 30, 2012, 07:27 AM
#13
Evolved Member
FWIW Porsche has a spec of cracks no longer than 4mm. Our shop has always gone with no cracks that connect cross drillings or no cracks that run to the edge of the rotor.
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