Guides

Parts Knowledge Centre

Plain-language guides to identifying parts and understanding the systems they belong to.

Part identification

How to identify a heavy-duty truck part before you order

Part numbers, photos and vehicle details: what to collect so the replacement matches the first time.

Brake systems

A plain-language tour of compressors, dryers, valves, chambers and foundation brakes.

Maintenance

Oil, fuel, air, coolant and cabin filters — and the details that make one interchangeable with another.

Suspension

Style numbers, mounting and heights — the details that determine the right air spring.