Introduction to the Principle of Air Brake Master Cylinder

[EverlyLee]

Introduction to the principle of air brake master cylinder is as follows: When the brake pedal is pressed: The pull rod drives the brake valve arm downward, and the upper end of the brake pin is lowered with the pin shaft as the fulcrum, so that the air inlets of the upper and lower chambers of the brake valve are respectively connected to the air outlets of the chambers. This allows the air in the front and rear chambers of the air storage cylinder to enter the front and rear brake chambers through the upper and lower chambers of the brake valve, thereby pushing the brake into operation. When the brake pedal is released: The brake valve connects the brake chamber to the atmosphere to release the brake. The maximum stroke of the parking brake chamber push rod is 10% larger than that of the driving brake push rod. Therefore, when the driving brake push rod has already moved to the maximum stroke but the brake gap is too large to achieve full braking, the parking brake chamber can be vented, and the driving brake push rod can be further extended with the help of the energy storage spring to achieve full braking.

[DelPaisley]

I usually drive heavy trucks, and the air brake master cylinder is just like our heart. When you step on the pedal, it starts pressurizing the air. The air first comes from the air reservoir, pushing open the internal valves. Then, the high-pressure air travels through the pipes to the four wheel brake chambers, clamping the brake pads. If you release the pedal, the valves change again, releasing the air to disengage the brakes. The advantage of this design is its strong force, ensuring the truck can stop when hauling cargo. But it's particularly afraid of water; if water gets into the air lines, it affects the response. Before every trip, I check the drain valve at the bottom of the air reservoir.

[VanAdalynn]

The air brake master cylinder operates in a fascinating way. It features two sets of piston systems connected to the brake pedal. When the pedal is pressed, it pushes the balance spring to open the intake valve, allowing high-pressure air to rush into the cylinder. This airflow splits into two paths: one goes directly to the front wheel brake chambers, while the other passes through a delay valve to reach the rear wheels. Upon releasing the pedal, the return spring activates, closing the intake port and opening the exhaust port, instantly releasing the air pressure. When I was learning auto repair, I disassembled a master cylinder - the sealing rings inside are most prone to wear. Rubber deterioration can cause slow air leaks, making the brake pedal noticeably sink when pressed.