When driving a combination vehicle on a downgrade, what is the proper braking technique?

DOWNGRADE BRAKING — COMBINATION VEHICLES: Long/steep downgrades risk brake overheating and fade (loss of braking from heat). PROPER TECHNIQUE: (1) Before starting down, SELECT A LOW GEAR — gear selection should be done before the descent (modern transmissions may not allow downshifting once moving fast); (2) Use ENGINE BRAKING (compression/jake brake, retarder) as the primary speed control; (3) Use the SNUB METHOD for service brakes: when speed builds about 5 mph over your target, apply the brakes firmly to slow about 5 mph below target, then RELEASE; repeat — this allows the brakes to cool between applications; AVOID continuous (riding) brake application — generates constant heat, causing brake fade; PROPER SPEED: Choose a safe speed for the grade, weight, road, and weather; heavier loads need lower speeds; WATCH for brake check areas and runaway truck ramps; brake fade from improper downgrade braking is a leading cause of runaway truck crashes; the combination of low gear + engine braking + snub braking keeps brakes cool and the vehicle controlled.