Anti lock brakes vs regular brakes11/22/2023 All other things being equal, a large disc will slow you down faster than a small disc. So now we have a very small window where you could induce some friction fade if you were really trying to do it but we have had next to no issues with boiling the system.” Disc sizeĭiscs are available in different sizes. “We could induce this on a 140mm rotor so we altered the backing surface on the pad to dissipate that heat way better. That is much better than having the system boil. “What we did see is that when we decelerated from 50-60kph down to 15kph in 1-2 second increments on a switchback descent there was friction fade where you’d lose some of your coefficient of friction in the pad. But what happens is that the brake reaches a steady state where the heat isn’t increasing. Speaking about the development hydraulic brake systems, SRAM’s Paul Kantor said, “Where you might have trouble is with some big guy riding down the Stelvio for 45 minutes dragging the brake, and we were worried that we’d have boiling issues there. This acts on the pistons in the brake calliper to push the brake pads against the disc rotor. Pulling the brake lever in a hydraulic system moves a piston inside the master cylinder which forces brake fluid towards the brake calliper. Mechanical systems are operated by a cable, like the vast majority of rim brakes, while hydraulic systems use fluid to transfer the force from the lever to the calliper. You can divide disc brakes up into two types: mechanical and hydraulic. Linked to that, a side benefit of disc brakes is that your wheel can go out of true without rubbing on the brake pads. That's part of the reason why discs have become popular for endurance and adventure bikes. With a rim brake, the tyre has to pass through the brake calliper, but that's not the case with discs, so they free up space for wider tyres. The result is that disc brakes are far less likely than rim brakes to be affected by water or gunk thrown up from the road. There are holes in a rotor that allow water to get out from underneath the brake pads too. Plus, with a disc system the braking surface, the rotor, is much further from the road than it is with a rim brake so it’s less likely to get wet from surface water. Anyone who has ever ridden carbon-fibre rim brake wheels knows that while they might be lightweight and fast, the braking performance isn’t brilliant, especially in wet conditions. With a rim brake system, you want the wheel rim to be as light as possible, you need it to be strong, and it also has to provide the braking surface. We’re really talking about decelerating substantially without locking up the wheel.”Ĭheck out what big bike industry names thought about the introduction of disc brakes on road bikes from a couple of years ago. That’s a term we don’t really care for, but it’s fine. Some people refer to that as ‘modulation’. You can take off more speed with greater control prior to locking up the wheel. “Everything we’ve focused on is prior to locking up the wheel. Locking up the wheel isn’t hard but if that were our goal we’d just sell you a stick that you could ram in there and you’d be done! SRAM’s Product Manager Paul Kantor told us, “I can certainly lock up my wheel with a carbon rim and a mechanical rim brake, but if I do that I’m still just sliding down the road and that sucks.
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