Spring brake chamber
Large coil spring provides sufficient force that hold brakes in the applied position. They are not using air for that matter. This large coil spring in accommodated in section added to the service brake chamber.
Remember, the large coil spring is compressed under high tension which generates various hazards and risks such as spring brake chambers explosions.
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In other words, don’t try servicing and repairing air brake chamber on your own.
How to disable spring brake chamber?
The most usual way of disabling the spring brake chamber is by using a caging bolt. This should be done only in emergency situations. If you face the disabled spring brake chamber, have your vehicle inspected as soon as possible.
Spring Brake Control Valve
The purpose of spring brake control valves is responding when air pressure in brake system drops below normal level (usually 60 psi).
In most of newer vehicles there is a diamond shaped push and pull control knob that is used for engaging the parking brakes. If you pull the knob out, the brakes will engage, and if the knob is in, you can release the brakes.
