Great brakes that are good for one application are required. Control speed with proper gearing. Riding brakes going downhill is a recipe for disaster, that is what all those runaway truck ramps are for. If one does not know what gear to use, start with lower gear ‘til certain have speed under control, then OK to shift up a gear ‘til speed is under control again, etc.

Ed

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.