11 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHFront rotors
Leading reported evidence
Replace front rotors and pads
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Leading evidence: 'Replace front rotors and pads' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace front rotors and pads' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
If there is ANY bias at all, it's likely minimal - but I personally would feel uncomfortable running different front rotors until I'd confirmed with someone smarter than me that the difference between the two rotors is primarily cosmetic, with no difference in braking/heat dissipation/etc.
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Suggestion
My opinion is completely uninformed, and not based on any engineering, science, or logic, but I wouldn't run different types of rotors.
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Suggestion · Original poster
Car is used 99% for commuting and maybe a HPDE event next year but track time wouldn't be consistent use.
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Suggestion
If there is ANY bias at all, it's likely minimal - but I personally would feel uncomfortable running different front rotors until I'd confirmed with someone smarter than me that the difference between the two rotors is primarily cosmetic, with no difference in braking/heat dissipation/etc.
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I recently replaced my front rotors and pads. I purchased Sebro slotted and coated rotors and Hawk Performance pads. I received the parts and took apart everything over the holiday to find out after installing one side that the rotor that was shipped for the other side was a cross drilled sebro and not slotted (I think Pelican has the item description wrong on their site but it could be that Sebro shipped the wrong rotor). Anyway, I needed the car to drive and decided to put on the cross drilled rather than wait and get the correct one. So now I have slotted on one side and cross drilled on the other figuring the worst case scenario is that I have to throw away a $100 rotor if mix matching is a problem. While the two different rotors might wear or perform slightly differently over time, I thinking it's not worth throwing away a new rotor just to get a match on the front. Anything I'm missing? Car is used 99% for commuting and maybe a HPDE event next year but track time wouldn't be consistent use.
I'm supposing that slotted rotors have different surface area than drilled rotors. If there is ANY bias at all, it's likely minimal - but I personally would feel uncomfortable running different front rotors until I'd confirmed with someone smarter than me that the difference between the two rotors is primarily cosmetic, with no difference in braking/heat dissipation/etc. between the two sides. Will they heat up at the same rate, and will they shed heat similarly? Drilled rotors are supposed to cool more quickly than plain or slotted rotors; slotted rotors are alleged to handle outgassing better than drilled or plain rotors. That 1% of your time doing HDPE events is the one percent I'd be thinking about...
I'm a fairly crappy driver when it comes to AX and the like - but even so, I wouldn't want to add an unknown quantity to the front brakes...
I can't see there being any issues. When I was talking to the engineer at Coleman Brakes he said slotted/drilled was marketing and that he hadn't seen any noticeable difference from smooth rotors in his testing.
My opinion is completely uninformed, and not based on any engineering, science, or logic, but I wouldn't run different types of rotors. It just seems like a bad idea. And is cheap to fix...
I think it is more a mental issue than physical. I would get in touch with the vendor and have them ship the correct matching rotor. In my mind I would always be thinking about the different rotors every time I drive the car. To me, it would be like having two different tires on the front...same size and all...but different. It would drive me crazy. I know the cross-drilled rotor is now used, but I would just spring the money for a matching rotor and turn the other one into a wall clock, or bookend, or recycle it. You might also consider that the HPDE tech inspection might not pass the car with two different style rotors. Food for thought....
There will likely be a slight weight difference between the drilled and slotted rotor too. Would I lose a bunch of sleep over it, probably not, but I'd still prefer to have the same type on both sides of the car.
