Must Brake Discs with Grooves Be Replaced?

[LandonFitz]

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.

[VanCaden]

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.

[VanLola]

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.

[ORicardo]

Grooves may not necessarily need replacement; depth and safety must be evaluated. Minor grooves can be polished, but severe grooves that cause uneven braking or overheating require new discs. Brakes are critical components—don't take risks with safety. Consult a professional technician if in doubt.

[StFaith]

Brake disc grooves don't necessarily require replacement, especially when on a tight budget. My friend's car had shallow grooves - resurfacing solved it for just tens of dollars cheaper, but once discs get too thin they're harder to rework. If grooves are deep or you notice odd braking sensations like uneven force or loud noises, replacement is more reliable. Don't ignore risks to save money short-term, as it may cost more in repairs long-term. Regular brake pad changes help prevent groove formation.

[SanHarmony]

Grooves are formed due to impurities in brake pads or uneven wear, affecting the contact surface. The treatment depends on the remaining thickness of the disc; grinding is sufficient if it meets standards, otherwise replacement is needed. I recommend measuring the depth—if it exceeds the limit or the issue is severe, replace the disc to ensure smooth braking. Choosing high-quality parts when replacing can extend its lifespan.