What is the proper method of braking when going down a long and/or steep grade?

The proper method of braking when going down a long and/or steep grade involves adjusting speed appropriately to ensure safe control of the vehicle. Braking until your speed is about 5 mph below your "safe" speed allows for a small buffer while maintaining better control. This approach helps to prevent overheating of the brakes, which can occur with continuous braking, as well as reducing the risk of brake failure due to excessive use.

The idea behind this technique is to utilize engine braking whenever possible, allowing the vehicle to descend more efficiently while maintaining a safe speed without continually applying the brakes. By keeping the speed slightly below the safe threshold, it ensures that the driver has adequate control should any unexpected situations arise, such as sudden stops or obstacles on the road.

The focus is on controlling speed effectively with the brakes used strategically rather than constantly, as seen in the other options. This method enhances safety on inclines and ensures that the braking system doesn't become overstressed.