The parking brake is also known as the "hand brake" by drivers. This brake controls the energy released by the rear wheel spring energy storage brake cylinder through the hand brake valve operating the relay valve to make the rear wheel brake have a braking effect. Pull the hand brake valve back, the larger the angle, the lower the air pressure controlled by the relay valve, that is, the lower the release air pressure of the spring brake cylinder, so the energy of the spring energy storage brake cylinder is greater, which makes the braking force of the rear wheel. bigger. The handle of the control valve is pulled back, and the air pressure is released to the end, the spring brake cylinder has the maximum energy, and the rear wheel brake is held to achieve the purpose of parking braking.
In order to ensure reliable braking, a four-circuit protection valve is added to the air circuit system, which divides the air circuit from the air compressor into four independent and interconnected circuits: the front brake circuit, the rear Brake circuit, the parking brake circuit, and auxiliary air circuit.
When the brake cannot be released after the hand brake valve is released, the parking brake circuit should be checked. There is gas in the parking brake circuit at ordinary times. Because it is less used in operation, the condensed water in the pipeline is correspondingly more.
Please pay attention to users: In order to operate safely, before the arrival of winter, it is necessary to carry out seasonal maintenance and implement winter regulations.
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