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2020 Runoffs recap

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Just a few questions...how are the "pre-bed pads" bed to the rotors?  In other words, if I buy "pre-bed" pads, what are they bed to?


What do I do with the pads and rotors that I apparently messed up?


When you switch pad compounds, do you need to switch rotors?


Why are these pads so complicated?



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Steve Scheifler

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As you’ve surmised, pre-bed is a misnomer, pre-baked or pre-gassed would be more honest. You still need to bed them, and the most important part of that is putting down a uniform film of pad material on the rotor.

Old rotors are fine, just sand them enough to remove any deposits or have them minimally turned. Pads are likely just glazed so you can sand them as well and they will probably be good to go.

As for why they are so difficult even compared to others you’ve run, ask the manufacturer but the easy answer is predictable enough. Personally I tried the various popular brands then settled on Cobalt which has none of these issues and were exceptional IMO, but lately I’m hearing about supply issues.
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Jim Drago

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I agree with what Steve said above.  Since I run the same compound all the time, I put pads on without changes rotors often.  I also put new pads on for one of the qualifying sessions.  I hit the brakes a few times for the first few corners while scrubbing and then went 100% with no issues. I have heard a few stories of pre bedding and decided quickly I didn't have time to waste for $20.00, so I have NEVER run anything but the pre bedded.  I know they are put in an oven and heated and basically heat cycled. But that is a question for Danny.



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I also swear by G-Loc compounds and buying pre-bed. I run the 16/10 combo exclusively only because I have found 18s are hard on rotors. Also I send it 100% and don't worry much about bedding to rotors.

New pads are great and will always give the best initial bite mostly because they are flat and parallel. I always replace them with 3/4 meat left or more due to slight pad taper which causes drag and a spongy pedal. When I'm feeling crafty (or out of money) I'll put used pads on my mill and grind them flat and parallel again.

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