Should the Front Brake Disc Be Replaced if It Has Grooves?

[LondynDella]

Grooves on the front brake disc indicate uneven wear. They can be removed and polished, but replacement is necessary if the grooves are deep. The replacement steps are as follows: 1. Open the engine compartment and check the brake fluid level to ensure it is within the normal range, preventing overflow during the replacement process. 2. Use a jack to align with the support points under the car and raise the vehicle until the tire is completely off the ground, then remove the tire. 3. Use a wrench and socket to remove the bolts of the brake caliper, then take out the brake pads directly. 4. Push the brake piston back in, install the new brake pads, and reassemble the original parts in the reverse order of disassembly. 5. After installation, check the brake fluid level again. Press the brake pedal firmly several times to ensure the fluid level remains within the normal range.