Use this checklist as a guide when completing a mechanical inspection of the air brake system components.

Note: When performing an inspection as part of a practical examination, tell the examiner what you are testing at each step of the inspection.

Prepare the vehicle for inspection:

• Apply the spring brakes.
• Put wheel chocks or blocks in place.

Inspect foundation brake components at each wheel for:

• brake shoe lining not contacting the brake drum;
• damaged, missing or malfunctioning foundation brake components; and
• cracked, loose, missing or contaminated brake lining, improper drum contact or lining thickness that is less than required.

Inspect brake chambers at each wheel for:

• audible air leaks;
• cracks and non-manufactured holes;
• mismatched air brake chamber size on a steering axle; and
• mismatched slack adjuster length on a steering axle.

• cracked or broken brake drum or rotor.

• audible air leak;
• damaged or worn air line; and
• improper fittings used to connect or repair an air line.

• insecure mounting.

• loose air compressor drive belt pulley;
• loose, cut or frayed air compressor drive belt; and
• insecure air compressor mounting, bracket or fastener.