Braking System

Question 1

• Braking system is equipped with a dual circuit air brake (primary and secondary) system
• rearspring brake parking system
• antilock braking system 2000-2016
• Auxiliary front axle parking brake system on 2000-2016.

Answer 1

Reference

Question 2

Braking
Downhill or heavy braking- always rely on the braking effect of: 
- engine 
- engine brake 
- exhaust brake
- retarder

Answer 2

Reference

Question 3

Braking

• If service brakes are required, apply the brakes in short durations of ___-___ seconds rather than continuous application. This will minimize heat buildup and reduce the possibility of brake fade.
• LTI- NO “pumping” the brake pedal because it may deplete the brake systems air reservoir supply.

Answer 3

5-10 seconds

Question 4

Brakes. Air circuts.

• Front axle and the rear axle brake circuits are each supplied air by seperate air reservoirs.
• Safe operation is between 90-120 PSI
• Secondary system supplies air to the front axle.
• Primary system supplies air to the rear axle.

Answer 4

Reference

Question 5

Air brake warning lights.
- When pressure drops below approximately 65PSI (LTI) and 60 PSI (PIERCE) a warning buzzer and light will come on. As soon as system air pressure increases past 65-75 PSI, the warning light and buzzer will shut-off.

Answer 5

Reference

Question 6

Antilock braking system 2000-2016.

• Automatically applies and releases the brakes during low traction or panic brake applications to prevent wheel lock-up.
• Improves both braking efficiency and steering control.
• integral to the air brake system and therefore cannot be turned off or overridden.
• when braking, always maintain a firm steady pressure on the brake foot pedal to achieve the necessary change in speed or to bring the apparatus to a complete stop.
• When the ABS applies the telma retarder is automatically deactivated.

Answer 6

Reference

Question 7

Parking brakes.

• Spring brakes are located on the rear axle
• If air pressure is reduced to approximately 40PSI in both systems, the spring brake valve will automatically apply.

Answer 7

Reference

Question 8

Braking system
Chock wheels.

• When parking the apparatus, whether on level terrain or on a grade, always chock the wheels.
• Dept. pollicy- always chock the wheels when on scene

Answer 8

Reference

Question 9

Braking system.
Air dryer.

• Removes moisture and contaminants from pressurized air, which comes from compressor before it reaches air reservoirs.
• Moisture collected on the surface of desiccant pellets is discharged out the bottom of the air dryer each time the governor unloads.
• Replaced every other year (Pierce 2-3 years)

Answer 9

Reference

Question 10

Braking system

Auxiliary front wheel locks. 2000-2016

• Uses air brake system PSI to keep the front brakes applied.
• Used to augment rear spring parking brakes in event the rear parking brakes cannot hold the apparatus on a steep incline.
• If there is a leak in the system the front wheel locks may fail.
• Must be used in conjunction with the maxis

Answer 10

Reference

Question 11

Braking system

Disc brake calipers lube.

• Do not use lithium grease because it will not provide adequate lubrication
• S&M lube during annual ladder test and brake replacement.

Answer 11

Reference