Air brake problems park a truck by design. A mobile mechanic finds the leak or failed component and gets the system holding pressure again — safely.
The mechanic traces air leaks, replaces failed chambers, valves, glad hands, and lines, and adjusts or replaces slack adjusters. Brake work is safety-critical: it gets done to spec, on site, and the truck does not move until the system holds.
The common failures — chambers, lines, valves, adjusters — are all roadside-repairable. Full axle brake jobs and drum/rotor work belong in a shop, and your mechanic will say so if that is what the truck needs.
RIG works on anything diesel — and only diesel. Big rigs and semi trucks, diesel RVs and motorhomes, diesel pickups and work trucks: every mechanic in the network is a diesel mechanic, so your breakdown goes to someone who works on engines like yours every day.