Mobile Service · I-35 & I-70 · Eastern Kansas
Air coupling, seal, and fitting repair on tractor and trailer. Roadside service across eastern Kansas, 24 hours a day. We come to you with the parts in the truck.
Call 866.769.2580 Send a Request →The glad hand is the air coupling that joins the tractor to the trailer brake system. There is one on each line, supply (emergency) and service (control). They lock together with a quarter turn and seal against a rubber gasket so the tractor can charge the trailer reservoir and modulate the trailer brakes.
When the rubber seal flattens, the metal body cracks, or the lock tabs wear, the connection leaks. A leak at the glad hand is a leak in the brake system, and the truck will not build pressure or release the parking brake.
Cold mornings are the most common reason. A seal that held fine in October stiffens in January and starts hissing at hookup. We also get calls from drivers whose glad hand snapped off when a trailer dropped or rolled on the line, drivers chasing an audible leak after a yard swap, and drivers whose service line will not seat into the trailer coupling after a rough hookup.
If the truck will not release the parking brake, or if you hear air bleeding off the coupling between tractor and trailer, the glad hand or its seal is usually the first place to look.
Air brake system integrity is a core item on every DOT roadside inspection under FMCSA 393.45 and 393.47. A glad hand leak shows up in the air loss rate check and can put the unit out of service. If you are sitting at a weigh station on I-35 or I-70 with an air leak writeup, replacing the glad hand or its seal is often the fastest path back to legal.
Pricing depends on parts and travel distance. We will quote on the call before we roll the truck.
Call 866.769.2580 Send Request Online →