What Causes the Raised Edge on Brake Discs?
4 Answers
Brake disc edge protrusion causes: Severe wear on the brake disc, which only requires replacement with a new one. The braking system is crucial for vehicles as it directly affects driving safety and stability. A car's braking system mainly consists of brake pads, brake discs, brake linings, vacuum booster pumps, master brake cylinders, and slave brake cylinders. Brake discs undergo wear during use, and uneven wear can lead to an uneven surface—some areas higher and others lower. This condition causes brake judder, affecting braking performance. If an uneven brake disc impacts braking effectiveness, it should be removed for resurfacing or replaced entirely.
I often encounter the issue of raised edges on brake discs while driving, which is primarily caused by normal wear and tear. This happens because the brake pads only frictionally contact the central part of the disc during braking. Over repeated use, that area becomes thinner, while the untouched edges remain relatively thicker, forming a raised edge. I drive an older car, and during every maintenance session, the technician checks this condition. If left unaddressed, I experience strong vibrations when stopping, accompanied by harsh squealing noises. Once, I neglected it, and after replacing the brake pads, the unevenly worn disc caused the car to skid during braking in the rain, nearly leading to a minor accident. Since then, I've been visiting a professional repair shop every six months to measure the disc thickness. If it's worn to the limit, I replace it promptly to avoid bigger troubles. Additionally, driving habits are crucial—avoiding sudden braking and frequent light braking in heavy traffic helps extend the replacement cycle.
Brake disc edge protrusion is a common mechanical issue caused by uneven wear during normal usage. When braking, the pads only press against the central friction area of the disc, leading to thinner centers and thicker edges over time. This creates imbalance in the braking system. During my own vehicle inspections, I've noticed the protruding edges are prone to rusting, especially in humid conditions, affecting stopping smoothness. The solution is regular brake maintenance. If the protrusion is excessive, complete disc replacement is recommended to prevent rapid wear of new brake pads. I've developed a habit of gradual deceleration while driving to minimize unnecessary wear - safety always comes first. It's advisable to request technicians measure disc thickness with calipers during each service to ensure it remains within proper specifications.
The reason for the raised edges on the brake discs is quite simple: normal wear causes the center of the disc to thin out, while the edges remain untouched, creating a raised effect. My car developed this issue after 50,000 kilometers, causing slight vibrations while driving. The solution is straightforward—just inspect and replace the old discs. Just make sure it doesn't affect the lifespan of the new brake pads.
