A Model T Ford will climb an 8% (1 in 12) gradient in top gear with full throttle, and will come down it in top gear with no throttle and no brake application. They can safely negotiate 20% or more grades in low range, so hills should hold no fears for Model T Ford owners, but a few words of advice at this point.
Going up is relatively easy, just give the Lizzie full throttle and retard the ignition a little as the speed falls, and she should slog up the hill in fine style provided there is a reasonable amount of fuel in the tank. The T needs about a quarter tank full to climb a 20% grade, as the gravity feed system becomes less effective the steeper the grade. It was common practice, if the grade was too steep and the engine starved for fuel, to back a T over the grade.
As a general rule going down hills should be done at about the same speed as going up. However, the real secret is to successfully use engine compression to slow the car speed on a hill. Move the throttle lever up to minimum or to a setting which will maintain a safe down-grade speed. As there is no return spring on the throttle lever it can be set as slow as necessary, and will hold position. If braking is still necessary, let the pressure off the pedal every so often to prevent burning the linings. Reverse pedal can also be used to brake for added effectiveness if needed. (see “Saving Your Bands” below).
If you need to stop on a steep grade, use low gear as you brake, but be careful to not over speed the engine in low gear. Be aware that there is no engine braking, if the left foot pedal is held in neutral between high and low gear positions. Jamming all three pedals down will stall the engine and skid the rear tires, not an acceptable solution to emergency braking, except on dry pavement, and even then not recommended. NEGOTIATE HILLS AT SAFE SPEEDS, do not allow the car to “Roll Out.”