FAQ:Solutions of Himax Machinery Ltd

Why does the brake sometimes have noise?

Answer: brake noise usually refers to brake squeal, short low chirp, or brake howling in the whole process of automobile braking.

.The cause of the noise of the disc brake

1. Due to the sealing ring tension of piston back position is insufficient, the surface of brake disc wear serious, with deep grinding marks and drainage ditch phenomenon. When braking, the contact surface is partial. Thus, it will cause jumping, vibration, screaming in the braking process.

2. Vibration damping pad off or failure

Between the two friction linings of disc brake and plunger, a piece of damping pad should be attached on each side. The damping pad is shaped by 0.5- O.8mm quenching cold rolled sheet, both sides coated with rubber layer, a buffer, damping effect. It can reduce the vibration frequency of the friction block. If the vibration off or failure, it will increases the brake squeal.

3. The surface of friction block grinding glaze

The embrittlement shining glaze layer of friction block surface, its friction coefficient is lower than that of the normal friction block.

It not only can cause brake squeal, but reduce the braking performance. In general, the glaze phenomenon is caused by frequent emergency braking (especially inferior friction material). It also may be caused by oil pollution of the friction block surface.

The vehicle with [Front disc and rear shoes" brake configuration, the braking force of front disc brake accounts for about 60% to 80% of full force (the ratio of front wheel drive vehicle id higher), so that the front wheel brake squeal (especially unilateral squeal), drivers should be paid attention. And focus on the following reasons:

A. During the brake disc rotation, working face beat more than 0.05mm may cause brake disc deformation or surface defects.

B. The damaged piston seal of brake caliper assembly cylinder, cylinder cracks and other reasons can cause the brake oil leakage, pollution of friction block surface.

C. The venting of caliper assembly without using special catheter, it can result in brake oil out to pollute friction block.

D. The broken oil seal of wheel hub can make grease pollute friction block.

[b]: Will Himax brake pads make noise?

Answer: In certain models and conditions, it will make noise. However, before the new product research, aiming at the most vehicles, Himax brake did a lot of noise optimization experiments in the working conditions of the formula and the pressing process. After testing the noise characteristics of brake pad without any attachment, it reduces the probability of noise through experimental methods changing slotting, chamfering and preferable sound protection pad.

Although the existing noise of Himax brake pads is unavoidable, in the production process of strict control, the probability of noise is much smaller than the other brake.

[b]: What is the relationship between the life of the brake pads and the hardness (compression ratio)?

Answer: In general, the structure of hard material is better and the texture is dense. In a certain range, the life will increase with hardness.

[b]: What is the relationship between the noise and the hardness (compression ratio) of the brake pads?

Answer: The material of high compression ratio (soft) has better shock absorbing performance. In a certain range of hardness, noise will increase with hardness.

[b]: What is the compression rate? What is the index of compression ratio?

Answer: The compression rate is the change of the thickness of the friction block under certain pressure.

Index of the compression rate: the compression rate can not exceed 2% for after-sales products. OE products are jointly formulated by the automobile factory and the brake pads. And the most effective compression is selected based on guaranteeing the performance of safety and wear. The compression ratio plays an important role in the optimization of noise.

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