What Causes the Rear Brakes of Electric Vehicles to Squeak?
3 Answers
The reasons for squeaking rear brakes in electric vehicles are: 1. Brake pads are too hard; 2. Brake pads are worn down to the backing plate; 3. Excessive wear of the brake disc or brake drum; 4. Rust on the brake caliper; 5. Stiff parking brake cable; 6. Slow return of the master brake cylinder, etc. In such cases, it is recommended to check whether there are hard spots, scratches, or loose attachments on the right brake pad, foreign objects between the brake disc and pad, and to contact the local 4S store for inspection and repair. If the car is new, because both the brake pads and discs are brand new and are in the break-in period, noise may occur while driving. This type of noise is nothing to worry about, as it will automatically disappear after the car has been driven for a while and the break-in period is over.
Last time I checked the electric vehicle, there were several common reasons for the rear brake noise. The brake pads might be too thin or have small stones or sand stuck in them, causing friction sounds. The brake disc surface could be rusty or uneven, leading to noise when braking. Another reason is the drying up of wheel axle lubricant, resulting in metal-to-metal friction. Additionally, the rear brake of an electric vehicle works with the regenerative braking system, sometimes causing uneven load and faster dust accumulation, which worsens the problem. Ignoring it may increase the braking distance or even deform the disc, requiring costly and troublesome replacement. I recommend checking the rear brakes every three months, cleaning out debris, and applying some lubricant.
My electric car started making noise from the rear brakes not long after purchase, which is quite annoying. A knowledgeable friend suggested it might be uneven brake pad wear - grinding the rotor too hard can cause noise. It could also be rust on the disc after the last rain, which usually goes away after driving a short distance, but frequent occurrences mean maintenance is needed. I tried spraying some cleaner to rinse it, which temporarily quieted it down, but I still need to take it to the shop. While rear brakes are used less in electric vehicles, regenerative braking makes them prone to dust accumulation, so regular checks shouldn't be skipped. Don't wait until the noise worsens - repairs will cost more then.
