Stop the Squeal: Why Infrared Curing is the Secret to Quiet Brake Pads
Ever wonder why some brake pads just won’t stop squealing? Usually, it comes down to how they were baked. When the friction material doesn’t cure evenly, you end up with weird internal stresses and spots where the density is all over the place. That’s exactly what causes those annoying vibrations when you hit the brakes. We’ve found a way to fix this using shortwave infrared (IR) heating.
Getting into the core of the problem
Most shops use standard convection ovens. The problem is that those ovens heat the outside first. You’re basically waiting for the heat to slowly crawl its way to the center. This leads to a “skin effect.” The outside gets over-baked and brittle while the middle is still soft. Not a great recipe for a safe brake pad. Shortwave IR is different. It doesn’t just sit on the surface; it dives deep. It heats the core and the surface at the same time. Everything cures together, which means no more internal tension and a lot less noise.
The trick to getting it right
It’s not as simple as just turning on a lamp, though. You have to get the layout and wattage spot on. If your lamps are spaced poorly, you’ll get cold spots. And cold spots lead to warping. It’s that simple. You want a steady, equal flow of energy across the whole pad. Plus, you have to match the wavelength to the resin you’re using. Shortwave IR is the sweet spot for phenolic resins. It triggers a faster, tighter bond, giving you a dense, stable pad that doesn’t wear down or scream at the driver.
Real talk: Life on the shop floor
The best part? You aren’t waiting around for a massive oven to soak. Your cycle times drop significantly. It’s fast. Really fast. But there’s a catch. Because the heat is so intense, you can’t just “set it and forget it.” If you overshoot the temperature, you’ll scorch the resin and ruin the batch. To keep things from going south, we suggest using closed-loop pyrometers. Pair those with a PID controller to stop the heat from running away from you. It’s the only way to make sure every single pad coming off the line is built the same way.