Have you ever tried to back up an 18-wheeler? It's no small feat, but once you understand how air brakes in semi trucks work, it all starts to make sense.

Failing air chambers provide little warning of the trouble looming within. Their demise is usually sudden, accompanied by the agonizing sound of escaping air as the parts exhale for the last time.

It’s impossible to fix something without understanding how it’s supposed to work. Brake system repair decisions can be difficult to make, and costly to execute, without a basic understanding of system ...