In the multiplier power brake system, movement of the brake pedal

In the multiplier power brake system, movement of the brake pedal Correct Answer Actuates the valve to admit atmospheric pressure to one side of the diaphragm

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The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is
The Chipko movement started in Uttarakhand, this was a movement taken to protect the environment. It started in 1973 in Chamoli district. The farmers of the village fought this movement against the cutting of forests and jungles by state forest contractors. The people of the village wrestled with trees such that the contractors were not able to cut trees. There were several effects of this movement, few of which is given below. Which of the following, if true, would weaken the conclusion about the effects of chipko movement? 
The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, $$l$$ = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Diameter of brake drum in meters and d = Diameter of rope in meters)