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Relay Emergency Valve

by | Mar 1, 2015 | CDL Air Brake Valves

OBSOLETE   Fills the trailer air tanks (reservoir) and applies and releases the trailer service brakes. The relay emergency valve also applies the trailer emergency brakes in the event of a trailer breakaway or normal disconnect. Knowledge Test Question: In the...
Quick Release Valve

Quick Release Valve

by | Mar 1, 2015 | CDL Air Brake Valves

The quick release valve moves to reduce brake lag in the air brake system. #1) The QUICK RELEASE VALVES quickly releases air from the service brake chambers into the atmosphere after a service brake application is released. #2) The QUICK RELEASE VALVES quickly...
Manual Front Wheel Limiting Valve

Manual Front Wheel Limiting Valve

by | Mar 1, 2015 | CDL Air Brake Valves

OBSOLETE To reduce application pressure to the steering axle by 50 % compared to the drive axle brakes, when required by reduced road conditions (rain, snow or ice). The system consists of a dash switch with 2 positions: Dry Road: 100% front wheel braking; in other...
Brake Pedal – Foot Valve OR Treadle Valve

Brake Pedal – Foot Valve OR Treadle Valve

by | Mar 1, 2015 | CDL Air Brake Valves

MUST KNOW The brake pedal applies the service brakes – truck, or truck and trailer brakes. In other words, the brake pedal brings the vehicle to a stop when it it depressed. SHOULD KNOW The foot valve operates the secondary and primary sub systems...
Bobtail Proportioning Valve

Bobtail Proportioning Valve

by | Mar 1, 2015 | CDL Air Brake Valves

A bobtail proportioning valve great increases braking safety owing to different weight distribution.   A bobtail proportioning valve will reduce braking to the drive axle brakes by up to 75% when unhooked from the trailer. When a semi-trailer is removed from the...

Automatic Front Wheel Limiting Valve

by | Mar 1, 2015 | CDL Air Brake Valves

To reduce application pressure to the steering axle brakes during most braking situations. Reduced pressure to the steer axle brakes occurs for most braking applications. Only during hard braking is there equivalent pressure delivered to both the front and rear...