The use of brakes on a long and/or steep downgrade is only a supplement to which braking method?

The use of brakes on a long and/or steep downgrade is only a supplement to which braking method?

• A. The braking effect of the engine
• B. The hydraulic braking system
• C. The tire grip on the road
• D. The battery's charge level

Answer: (A)

On a long or steep downgrade, engine braking should be your main tool to slow the vehicle, with the hydraulic service brakes used only to supplement. By downshifting to a lower gear before or early in the descent, the engine and transmission provide resistance that slows the truck without relying on the wheel brakes. This keeps brake heat and the risk of brake fade under control, giving you steadier, safer braking. The hydraulic brakes still work, but using them as the primary means of descent braking can overheat them on a long grade. You’ll want to keep speed in check with light braking as needed, but don’t ride the brakes. Tire grip is important for braking in general, and the battery’s charge level doesn’t affect this downgrading technique.

On a long or steep downgrade, engine braking should be your main tool to slow the vehicle, with the hydraulic service brakes used only to supplement. By downshifting to a lower gear before or early in the descent, the engine and transmission provide resistance that slows the truck without relying on the wheel brakes. This keeps brake heat and the risk of brake fade under control, giving you steadier, safer braking. The hydraulic brakes still work, but using them as the primary means of descent braking can overheat them on a long grade. You’ll want to keep speed in check with light braking as needed, but don’t ride the brakes. Tire grip is important for braking in general, and the battery’s charge level doesn’t affect this downgrading technique.