Determine the weight of the vehicle from the current Brake Data Chart (the data includes an element of 140 kg or 300 Ibs for the weight of the driver, fuel, tools, etc.) Calculate the service brake percentage efficiency by dividing the total brake effort achieved when the service brake is applied by the vehicle weight and then multiplying the result by 100,
ie;
Total brake effort x 100 = % Efficiency
Vehicle Weight
Calculate the parking brake percentage efficiency by dividing the total brake effort achieved when the parking brake is applied by the vehicle weight and then multiplying the result by 100, as above.