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Is it necessary to replace the brake disc when changing brake pads?

2 Answers

DeCassidy

07/28/25 3:15pm

Replacing the brake disc is necessary when changing brake pads. The steps for replacing brake pads are: 1. Remove the wheel of the brake; 2. Use a wrench to remove the brake caliper bolts and take out the brake pads; 3. Use a cloth to clean debris from the brake caliper; 4. Install the new brake pads onto the brake caliper; 5. Tighten the guide bolts and check the braking effect. The working principle of brake pads is that the car uses the friction between the brake pads and the brake disc, as well as between the tires and the ground, to convert the kinetic energy of the moving vehicle into heat energy through friction, thereby stopping the vehicle. The function of brake pads is to provide stable, sufficient, and controllable braking force, with good hydraulic transmission and heat dissipation capabilities, avoiding hydraulic failure and brake fade caused by high temperatures.

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DeBarrett

08/11/25 10:49pm

I've been driving for over 30 years, and changing brake pads doesn't necessarily mean you have to replace the brake discs—it all depends on the condition of the discs. If the disc surface is pitted or severely worn, with grooves or cracks, then you absolutely must replace them together. Otherwise, the new pads will wear out quickly, and braking force will be uneven, making it easier to skid. I remember the last time I checked myself, I found the disc thickness was below the manual's standard, so I replaced them without hesitation—safety first. A brake failure at high speed would be disastrous. Always keep an eye on the wear level and regularly measure the thickness at maintenance points. Don't risk big to save small—this stuff concerns your family's lives.

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