The brake system (Figure 1 below) is mainly composed of brake pedal, brake booster, master cylinder, proportional valve, foot brake device (for example: disc brake, drum brake) and parking brake; the brake system works A simple overview of the principle: when the brake pedal is stepped on, the brake force is amplified by the lever principle at the pedal, and then the piston is driven by the hydraulic mechanism to amplify the braking force again. The amplified braking force pushes the piston to move, and the piston pushes the shoe to drive the brake caliper to clamp the brake disc tightly. The strong friction generated by the shoe and the brake disc slows the car
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In other words, the brake is a part of the entire braking system. Its main function is that the shoe is pushed by the braking force to drive the brake caliper to clamp the brake disc tightly, thereby achieving braking. Assuming that “motor vehicle brake hoses” are part of the brakes, it is appropriate to classify them into heading 8708.30. The author further understands the internal structure of the brake. Drum brakes mainly include brake wheel cylinders, brake shoes, brake drums, friction linings, return springs, etc. The structure does not include the “brake hose” discussed in this article. Therefore, from this level, it is not appropriate to be classified as “parts of brakes and power-assisted brakes” under tax code 8708.30.
2. The structure, purpose and function of the brake hose
The author looked up the national standard (GB 16897) related to this product, which defines the brake hose and brake hose assembly:
Brake hose, in addition to pipe joints in the brake system, it is used to transmit or store the hydraulic pressure, air pressure or vacuum for the application of automobile brakes;
The brake hose assembly is a brake hose equipped with a brake hose connector. The brake hose can be sheathed or without sheath.
In general brake systems, pipelines usually appear near the master cylinder and the wheels. But these two kinds of pipelines are different: several black pipes protruding from the brake master cylinder. These pipes are made of metal. The metal has no elasticity and will not expand due to the increase of liquid pressure to ensure the braking force. transfer. However, hoses have to be used at the end of the pipeline, near the wheels, because the vehicle suspension is always moving relative to the body during driving. At present, the brake hoses used in many cars are still rubber inside. The outer surface is covered with a steel wire braided tube, which can improve the high pressure resistance
The author believes that “motor vehicle brake hoses” are not normally used in the main components of the brake system such as brakes or master cylinders. Therefore, “motor vehicle brake hoses” are classified under item 8708.30 Debatable.
Post time: Apr-29-2021