The inspection of automobile brake discs is an important step to ensure driving safety. Here are a few common ways to check brake discs:

1. Observation

Visual Inspection:

Go around the car and double-check the brake discs behind each tire.

Ideally, the surface of the brake disc should be smooth and flat, with no obvious cracks, rust or unevenness.Use a flashlight or mobile phone flash to aid inspections, especially in low-light environments, where subtle cracks and wear marks can also be a safety hazard.If it is found that there are foreign objects such as oil and mud on the surface of the brake disc, it should be cleaned up in time to prevent affecting the braking effect.

Brake pad inspection:

Through the gap between the tire and the wheel, try to observe the thickness of the brake pads.Generally speaking, the thickness of the new brake pad is about 10~15 mm, and when it is worn to less than 3 mm of remaining thickness, it needs to be replaced.If you can't see the brake pads directly, you can use a professional brake pad measuring tool to inspect them, or take your vehicle to a professional repair shop for inspection.

2. Measurement method

Brake Disc Thickness Measurement:

There will be wear indicators on the brake disc, and three small pits are distributed on the disc surface, and the depth of the pit can be measured with vernier calipers.If the depth exceeds the standard value (the specific standard value can be referred to the vehicle manufacturer's recommendation), the brake disc needs to be replaced.

Brake fluid height measurement:

Open the hood, locate the brake fluid tank, and see if the fluid level is within the set limit (i.e., between the minimum and maximum tick marks marked on the reservoir).If the fluid level is lower than the minimum scale line, the brake fluid of the same brand and model should be replenished in time.If the brake fluid becomes cloudy, blackened or has sediment, it may be caused by deterioration or impurities, and the brake fluid should be replaced and the brake system should be cleaned in time.

3. Feeling method

Brake pedal feel:

Gently press the brake pedal to feel its initial phase of free travel (i.e., the phase when the pedal starts to move but has not yet generated braking force).

Under normal circumstances, this free stroke should be moderate and even.

As the pedal continues to press down, you should gradually feel the increase in braking force until the vehicle comes to a smooth stop.If the pedals are soft, there is no sense of resistance, or if you need to press hard to brake, it could be a sign that there is a problem with the braking system.

Sound Judgment:

Pay attention to the sound changes when braking while driving.

If there is a high-pitched whistling sound or a harsh metal grinding sound when braking, it may be caused by severe wear of the brake pads or an uneven surface of the brake disc.

At this time, the wear of brake pads and brake discs should be checked in time and corresponding measures should be taken to deal with or replace them.

4. professional equipment inspection

If possible, it can be inspected using professional brake disc inspection equipment. These devices are able to more accurately measure parameters such as the thickness and flatness of the brake disc, providing more accurate inspection results.

5. Precautions

When inspecting the brake disc, it is important to pay attention to the temperature of the brake disc. A few heavy brakes can make the brake disc very hot, so avoid checking or maintaining the brake disc if it is overheating.

If the brake disc is found to have problems such as severe wear, cracks, or deformation, it should be replaced immediately to avoid safety accidents.

When performing brake system maintenance, it is important to follow the recommendations and guidelines of the vehicle manufacturer to ensure the correctness and effectiveness of the maintenance operation.

In conclusion, regularly checking the condition of the brake discs is essential to ensure driving safety. Car owners can check the status of the brake disc through methods such as observation, measurement, feeling, and the use of professional equipment, and take timely measures to deal with or replace the problem when it is found.