The vertical parking brake (parking brake system) directly acts on the rear wheel braking mechanism via a mechanical cable, utilizing friction to prevent vehicle movement. Its core principle is: when the parking brake lever is pulled, the steel cable activates the brake shoes to clamp the brake drum or disc, generating braking force; when released, the return spring resets the mechanism.
Core Working Principle
Mechanical Transmission: The force applied to the handbrake lever is transmitted via a steel cable to the rear brake shoes, causing them to clamp onto the brake drum or disc. This generates friction to prevent wheel rotation.
Structural Components: Includes the brake lever, steel cable, brake shoes, return spring, and other parts. The structure is simple and operates independently of the hydraulic braking system.
Application Location
Typically applied to non-drive wheels (e.g., rear wheels on front-wheel-drive vehicles); some models may apply it to the drive shaft.
Usage Precautions
Avoid Over-Tensioning: Pull only to the 2/3 position. Excessive tension may cause component deformation or brake failure.
Long-Term Usage Effects: The steel cable may experience elongation due to plastic deformation over time, requiring regular inspection and maintenance.