Air-Brake Pre-Trip Drill

I am performing my pre-trip inspection

To make sure the school bus is safe to operate

I will inspect the air brake components

Identify the air brake controls and warning devices

Check the air pressure system

And perform the required brake tests

I will report any defects

And will not operate an unsafe vehicle

When air pressure gouges

They must be working properly

I must show the amount of air pressure

In the air brake system

I will monitor the gauges

Throughout the inspection

I am checking the low air pressure warning devices

The one in light and bosom is probably

The one who must activate before the air pressure drops

Below the required threshold

I am checking the parking day control

It must be in good condition and operate properly

It must apply and release the parking brakes as designed

I am checking the service brake pedal

It must be securely meant to not crack, not broken, and not loose

The pedal must have proper travel

It must not stick when apply or release

I am starting the engine according to the appropriate procedure

I'm watching the air pressure gauges to make sure

The compressor builds sufficient pressure

My system must build pressure at the required rate

And reaches normal operating range

I am following the prescribed procedure

'Til the governor cuts out and stops the compressor from pumping

As air pressure depresses

The governor must allow the compressor to resume pumping

Both pressures must be within the manufacturer's specifications

I'm following the prescribed procedure to reduce end pressure

I'm watching the gauges and checking at the low air pressure

Warning activates before pressure

I am checking that the spring breaks

Glide automatically when air pressure drops to the specified range

I will observe the gauges and parking brake control

I will follow the examiner's instructions

And keep the vehicle safely secured

I'm checking for excessive air loss

I will follow the required test setup

Allow the gauges to stabilize

Then observe the pressure loss for the required period

For a typical single vehicle

The commonly taught maximum leaketry

Two pounds per square inch per minute with the engine off and the brakes at least

Three pounds per square inch per minute with a service breakfully applied

I will follow the applicable Illinois test procedure

The air congressor

The air compressor is securely mounted, no cracked, no broken

And has no loose or missing parts, it supplies cool