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The treadle valve.

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12y ago

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A parking brake system is not required if your service brakes are fully?

A parking brake system is not required if your service brakes are fully self-locking. Air brake systems (on semis, for instance) hold the brakes open only when air is supplied. If you blow the air the brakes lock under spring pressure.


What is the difference between spring brake and service brake chambers?

On a T30 brake can, there are two chambers - the service chamber, and the emergency chamber. In the brake chamber, there is a spring.. when decompressed, it rotates the S-cam to lock the brakes. This is your parking brake. When you release the brakes, the emergency chamber remains constantly supplied with air to compress this spring, effectively releasing your brakes. The service chamber counteracts this, allowing you to utilize your brakes, but only when air is supplied to it when you push on the treadle valve.


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No, they use air pressure or actually the lack of air pressure to stop the vehicle. The brakes are fully on until pressure builds up in the tank releasing the brakes. When you push the brake pedal this removes air from the system and applies the brakes.


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We would need to know what type of brakes you have... S-cam air brakes, air disc brakes, air piston brakes, air wedge brakes, hydraulic drum brakes, hydraulic disc brakes... they're all different.


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Air brakes are just as effective as a standard set of brakes. The advantages to air brakes are that you do not have to worry about leaking brake fluid.


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