Air brakes Components
Holds compressed air
Air Tank
Mounted on frame of truck, used to control ride height of air bags
Air bag leveling valve
Pumps air into the air storage tanks (reservoir)
Air compressor
Collects and removes contaminants, Provides clean and dry air
Air dryer
Automatically adjusts brakes
Bendix auto slack adjuster
Converts the energy of compressed air into mechanical force and motion
Brake chamber aka maxi-can
Cast iron, foundation brake , drum style
Brake drum
Mounted in dash of truck, used to control parking brakes on Truck ( Yellow Button) and Trailer ( Red Button)
Dash Valve - MV-3
Mounted on truck frame, works with air bag leveling valve, used to remove air from air bags to ease truck removal from trailer
Dump Valve
Drive axle brake shoes
Eaton axle brake shoes
Likely caused by improper wheel bearing end play
Failed wheel seal
For attaching Tractor/Trailer hoses, will disconnect in an emergency
Glad hands
Controls when the air compressor will pump air into the air storage tanks.
Governor
Automatically adjusts brakes
Gunite auto slack adjuster
Inversion Valve Straight trucks and some tractors use an Inversion Valve which does not function during normal operation of the vehicle's brake system but operates in the event of a primary (rear service brake) system failure. When the Inversion Valve senses an imbalance of the primary and secondary delivery pressure during an application of the foot valve, it inverts that pressure to release air from the spring brake chambers. This permits the modulated application of the mechanical spring brake chambers on the rear axle(s) to assist the front brakes in stopping the vehicle safely.
Inversion Valve
The link between the brake chamber and foundation brake camshaft
Manual Slack adjuster
Quick Release Valve The Quick Release Valve does what its name indicates - it "quickly" exhausts air from the front service brake chambers for faster brake release or from spring brake chambers for faster parking brake application. On brake applications, the Quick Release Valve serves as a "T" connector, through which air flows to the brake chambers. When the foot valve is released, the air in the chambers is allowed to exhaust quickly through the quick release valve rather than returning to the valve to exhaust.
QR-1 Quick release valve
The Quick Release Valve with Two-Way Check is used in the anti-compounding circuit to prevent the application of the spring brake while the service brake is being applied. For example, when a driver is parking the vehicle, he may still have his foot on the brake pedal at the same time he pulls the yellow dash knob to apply the parking brakes. In this instance, the Quick Release Valve with Two-Way Check senses the application pressure from the dash valve and prevents the full application of the parking brake for as long as the service brake is applied. This action prevents the compounding effect which can cause bent chamber push rods, twisted s-cams, broken brake adjusters, damage to brake shoes or even cracking of a brake drum.
QR1C with Double check valve
Automatically adjusts brakes
Rockwell auto slack adjuster
Splined to slack adjuster, rides on bushings filled with grease, pushes rollers to apply drum type brakes
S Cam
Protects the tank and the rest of the system from too much air pressure
Safety valve
Used to apply service brakes only, can be on a steer, drive or trailer axles, not for parking
Service Chamber
Red ( Right side) for Emergency/ parking brake, Blue ( Left side)for Service brake
Trailer Air lines
Mounts to Steering column, operates trailer service brake only, not used for parking
Trailer Hand Valve aka Spike- TC-2
Located in cab floor, controls service brakes
Treadle valve or Foot valve
