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.
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