Air Brake Manual Chapter 5
Virtually all heavy-duty vehicles on the road today are using what kind of system?
Single-circuit air system
Dual-circuit air system
Triple-circuit air system
Water based air system
What is the function of a spring-brake chamber?
A service-brake chamber
An emergency brake in case of air-pressure loss
A reliable spring-applied parking brake
All answers are correct
Under normal operating conditions the primary reservoir operates the rear service brakes and the secondary reservoir operates the front service brakes.
True
False
What is the basic principle of the dual-circuit system?
To prevent total brake failures and give the driver more control
To decrease the reaction time of the driver
To make the air brake systems less complex
All answers are correct
The service-brake chamber applies the brake by air pressure and releases it by spring pressure. The spring-brake chamber operates in the opposite order.
True
False
What is meant by "compounding the brakes"?
When both the front and rear service brakes are used
When a service brake application is make with the park brake still applied
When only one form of braking is used to slow a vehicle
When the brake reservoirs become over-pressurized
Compounding the brakes is an effective and easy way to stop while protexting the brake components.
True
False
Where does the air come from to supply spring parking brakes on a dual-circuit system?
The supply reservoir
The primary reservoir
The secondary reservoir
Both the primary and secondary reservoirs
Why are spring brakes a reliable type of parking brake?
Because they can use air from either the primary or the secondary reservoir
Because they require no air
Because they can be reset easily
Because they operate by pushing a fun looking button
What mechanism allows a spring brake to also service as an emergency system?
Modulator valve
Blended air
The drive axle
The foot valve
To protect brake components, the park brake should remain engaged while a foot brake application is made.
True
False
If air pressure drops below ___ psi, the spring brakes won't return to full off position. At about ___ psi, the spring-brake control valve exhausts all the air and the spring brakes will be fully applied.
100 psi, 10 psi
70 psi, 20 psi
145 psi, 100 psi
100 psi, 90 psi
What function does the front chamber of a spring brake serve?
Acting as a service-brake
Performing emergency and parking functions
Allowing the flow of air to travel in one direction
To quickly exhaust air, reducing brake lag
What function does the rear chamber of a spring brake serve?
It houses a service-brake used to perform emergency and parking functions
To quickly exhaust air, reducing brake lag
It houses the compression spring used to perform emergency and parking braking
Allowing the flow of air to travel in one direction
Serious injury may result from an untrained person disassembling a spring brake
True
False
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