Pad/rotor coverage
04-13-21, 10:28 AM
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Pad/rotor coverage
I'm curious to get expert opinion on this.
Should the rotor on my tektro hydraulic brake cover the pad 100% of the pads or is the 97% that it covers now sufficient.
I have had no problems but my friend thinks it need to be covered 100%.
Should the rotor on my tektro hydraulic brake cover the pad 100% of the pads or is the 97% that it covers now sufficient.
I have had no problems but my friend thinks it need to be covered 100%.
04-13-21, 10:35 AM
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No disk brake expert here (and one would likely want to ask a engineer who designs and tests disk brakes for the best data) but I've seen so many rim and disk brake pads with less then 100% contact wear that I can't think a small amount less then 100% is a concern. The key is that "small amount less" reference.
I also will suggest that there's a lot more braking effectiveness loss with other tuning, alignment, fluid or cable condition aspects then a 3% contact difference. Andy
I also will suggest that there's a lot more braking effectiveness loss with other tuning, alignment, fluid or cable condition aspects then a 3% contact difference. Andy
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04-13-21, 10:44 AM
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If you are talking about the pad overhanging the rotor, yes that can be a problem as the part of the pad in contact with the rotor wears away, but the overhanging part does not creating a lip that can interfere with the function.
It the rotor is larger than the pad surface, there's not a problem.
It the rotor is larger than the pad surface, there's not a problem.
04-13-21, 11:04 AM
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anything more than a outer surface area being covered 99% & I'd question the reasoning.
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04-13-21, 06:17 PM
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04-13-21, 07:52 PM
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What happened now? Is your disc brake not stopping or something? If it is not stopping or working properly bring it to your local shop and have someone look at it. If it is working fine than I don't know what 97% has to do with anything.
04-14-21, 03:02 AM
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It's working perfectly but my friend was having a look at it just to make sure everything was ok and just saw how the caliper was positioned and pointed out that the pad was not touching the rotor 100%, he said it was touching 97%.
04-14-21, 03:04 AM
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04-14-21, 03:38 AM
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The pad should make 100% contact with the rotor. Otherwise a step is going to be worn on the pad and it's possible that the pads make contact between themselves before biting the rotor.
That said, I have a Canyon Grand Canyon in which the rear brake pads overhang the rotor by a few mm. I suspect the posts were badly machined at the factory because the brake is correctly installed and has zero spacers, but don't want to return the bike for several reasons, so I'm thinking about filing the posts a bit and call it a day.
That said, I have a Canyon Grand Canyon in which the rear brake pads overhang the rotor by a few mm. I suspect the posts were badly machined at the factory because the brake is correctly installed and has zero spacers, but don't want to return the bike for several reasons, so I'm thinking about filing the posts a bit and call it a day.
04-14-21, 08:32 PM
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