If the car was sitting for 7 weeks I'm sure there is going to be some flash rust on the rotors. If the dealer told you that they found that the rotors are starting to develop stress cracks from excessive heat then I would say go for it. Your rotors are fine.
Red cast on rotors = overheating?
Get a call from the dealer who has my GTR and he says the tech noticed a red cast/tinge on my front rotors, indicating, according to him, an indication I ran em beyond their heat range and they should replace em. I say bs, that the Hawk DTC 60s have an upper heat range of 1600 deg F. I think it's rust from sitting idle for 7 wks! So what do the experts think?
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Unless the rotors are physically warped, cracked (beyond crazing), or are worn too thin (unlikely), I wouldn't change them. Maybe somebody smarter than me can chime in as well but I doubt you have a problem.
The only color that you can use to indicate temperatures are temperature paints. Red on an iron rotor= rust.
http://www.stillen.com/product.asp?id=APRP...mp;model=MAXIMA
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http://www.stillen.com/product.asp?id=APRP...mp;model=MAXIMA
Most premium rotors are from gray cast iron which melts at 2060-2200 degrees F
Melting Temperatures
of Common Metals
Metal
Melting Point
(oF)
Titanium
3020
Mild Steel
2730
Wrought Iron
2700-2900
Stainless Steel
2600
Hard Steel
2555
Gray Cast Iron
2060-2200
Ductile Iron
2100
Copper
1985
Red Brass
1832
Silver
1763
Yellow Brass
1706
Aluminum Alloy
865-1240
Magnesium Alloy
660-1200
Lead
621
Babbitt
480
Melting Temperatures
of Common Metals
Metal
Melting Point
(oF)
Titanium
3020
Mild Steel
2730
Wrought Iron
2700-2900
Stainless Steel
2600
Hard Steel
2555
Gray Cast Iron
2060-2200
Ductile Iron
2100
Copper
1985
Red Brass
1832
Silver
1763
Yellow Brass
1706
Aluminum Alloy
865-1240
Magnesium Alloy
660-1200
Lead
621
Babbitt
480
Thanks guys, that's what I thought on the rotors, but he wanted to replace the pads not the rotors.
Remove the key part from your GTR key fob. When you can slide the metal part into the cracks in your rotors - they are ready for replacementGet a call from the dealer who has my GTR and he says the tech noticed a red cast/tinge on my front rotors, indicating, according to him, an indication I ran em beyond their heat range and they should replace em. I say bs, that the Hawk DTC 60s have an upper heat range of 1600 deg F. I think it's rust from sitting idle for 7 wks! So what do the experts think?
2
Were they cracked? How much material left?Thanks guys, that's what I thought on the rotors, but he wanted to replace the pads not the rotors.
Funny thing is he never mentioned cracking, only this mysterious "red" color on the rotors. My SA is only relaying info he gets from the tech. I haven't seen the car in 7 wks so I can't say. I do know the front rotors are still pretty new with only about 3 track days on them.
Update. My SA told me the tech was basing this info off what's stated in the service manual re oem pads. Is there some sort of red deposit on rotors when oem pads are ran above their temp range?
Check the brake pad for whitening (carbonizing) and uneven wear.Update. My SA told me the tech was basing this info off what's stated in the service manual re oem pads. Is there some sort of red deposit on rotors when oem pads are ran above their temp range?
Replace if necessary. Refer to BR-33, "BRAKE PAD : Exploded
View (GT-R certified NISSAN dealer)".
CAUTION:
• Replace the brake pad and disc rotor as a set.
• Replace all wheels as a set
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