Must Brake Discs with Grooves Be Replaced?
3 Answers
Brake discs with grooves must be replaced. Below is relevant information about brake discs: 1. Structure: Vented discs, also known as air duct discs, are divided into solid discs (single-piece discs) and vented discs (double-piece discs). 2. Function: Brake discs are used for braking, with the braking force coming from the brake caliper. Generally, most brake calipers have a fixed inner part where the piston pump is located, while the outer part is a clamp-type structure. The inner brake pad is fixed on the piston pump, and the outer brake pad is fixed on the outer part of the caliper. The piston pushes the inner brake pad through the pressure from the brake fluid line, while simultaneously pulling the caliper through reaction force to move the outer brake pad inward. Both pads press against the brake disc, generating braking force through friction between the disc and the inner and outer pads. In this process, the piston is pushed by brake fluid, which is hydraulic oil. This is assisted by the engine.
When grooves appear on the brake discs, replacement isn't always necessary, but the key factor is the depth of the grooves. I've seen many cars like this. If the grooves are minor, say less than one millimeter deep, resurfacing can restore smoothness without affecting braking performance. However, if the grooves are deep or unevenly distributed, continued use will accelerate brake pad wear, leading to vibration, noise during braking, and even compromising the entire braking system, increasing accident risks. Safety is no trivial matter. I recommend regular checks on brake disc thickness. Once it exceeds the manufacturer's recommended value or if there are noticeable braking abnormalities, don't hesitate—replace the discs immediately. Also, always opt for high-quality brake pads when replacing them, as this can reduce such issues and extend the vehicle's lifespan. Spending money on brakes is worthwhile—don't risk major losses over minor savings.
Last year, my car's brake discs developed grooves, and I was quite nervous when I first heard the friction noise. I took it to the repair shop, and the mechanic said the grooves weren't deep. After spending a hundred yuan to have them resurfaced, everything was back to normal. However, if the grooves are deep or the problem occurs multiple times, replacement is necessary; otherwise, braking performance will decline, making it prone to skidding at high speeds. I think car owners should always pay attention, such as checking whether the brakes feel smooth when pressed or if there's any vibration. For maintenance, minor grooves are simple and cost-effective to fix, but if safety is compromised, don't skimp on repairs. Regular maintenance can prevent issues before they arise. In short, don't delay—promptly finding a reliable shop for inspection can save a lot of hassle.
