The parking brake, commonly referred to as the handbrake, and formally known as the auxiliary brake, plays a significant role in providing supplementary braking functionality for vehicles. Whether it’s a family car, a conventional vehicle, or a special vehicle, the handbrake is an indispensable component. Particularly for special vehicles, which often operate in demanding conditions and require frequent stops and starts, the handbrake is utilized extensively. However, it is crucial to be aware that incorrect operation of the handbrake can lead to malfunctions in the handbrake system, potentially resulting in extremely serious faults and traffic accidents during subsequent driving. Therefore, vehicle owners have the responsibility to conduct regular and appropriate inspections and maintenance of the vehicle’s handbrake to ensure its proper functioning and safety.
Truck-mounted cranes, being a type of special vehicle, have specific requirements and considerations when it comes to the inspection and maintenance of the handbrake. Let’s delve deeper into this aspect by taking truck-mounted cranes as an example.
To assess the performance of the handbrake, it is necessary to drive the truck-mounted crane to a slope with a significant gradient and in good road conditions. Once in position, step on the brake pedal, shift the gear to neutral, and pull the handbrake handle to the designated working point. Then, gradually release the brake pedal. If the vehicle remains stationary and does not slide downhill, it indicates that the handbrake is functioning effectively. It is important to conduct this test both when going uphill and downhill to comprehensively evaluate the handbrake’s performance in different scenarios. This test provides a practical indication of the handbrake’s ability to hold the vehicle in place and prevent unwanted movement on slopes.
Similar to the pedal of the foot brake, the handbrake handle has a defined pulling stroke. Typically, when the handle is pulled to approximately 70% of its total stroke, the handbrake system should be in the normal braking position. Hence, before inspecting the braking capacity of the handbrake, it is essential to determine this 70% working point. This can be achieved by counting the clicks of the ratchet. The truck-mounted crane can be parked in a relatively quiet and stable area. Then, slowly pull the handbrake while keeping track of the ratchet clicks until the handle is fully extended. Subsequently, calculate 70% of the total number of clicks. This calculated position represents the effective working point of the handbrake handle and serves as a key reference point during inspections and evaluations.
In addition to the mechanical components, the handbrake also incorporates a return spring that works in conjunction with it. When the handbrake is engaged for braking, the spring is elongated, and when the handbrake is released, the spring retracts to its original length. Over an extended period of use, the handbrake can undergo deformation due to the repeated stress and strain on the components. To ensure the longevity and reliable performance of the handbrake, it is imperative for users to operate it reasonably and correctly. This includes avoiding excessive force when pulling the handle and ensuring that it is fully released when not in use to prevent unnecessary wear and potential damage.
Proper and regular maintenance of the handbrake is not only crucial for the safety of the vehicle but also contributes to the overall reliability and performance of the braking system. This includes inspecting the cables and linkages for signs of wear, checking the adjustment of the handbrake mechanism to ensure the correct tension, and lubricating moving parts as needed. By maintaining the handbrake in good condition, vehicle owners can minimize the risk of braking failures and ensure smooth and safe operation.
In conclusion, regardless of the type of vehicle, whether it is a standard passenger car or a specialized truck-mounted crane, if it is equipped with a parking brake, frequent inspections and maintenance are indispensable. This proactive approach helps detect and address potential issues before they escalate into significant problems, enhancing the safety and reliability of the vehicle on the road. Neglecting the maintenance of the handbrake can lead to unexpected and dangerous situations, emphasizing the importance of consistent and diligent care.
By adhering to a regular inspection and maintenance schedule and following proper operating procedures, vehicle owners can ensure that the handbrake functions optimally when needed, providing an added layer of safety and control in various driving conditions.
