What should the power brake pressure gauge read?

The correct answer reflects the standard operating procedure for monitoring power brake pressure in certain aircraft systems where proper brake function is crucial for safety and performance. A reading of 900 +/- 50 psi ensures that the braking system operates within the specified range necessary for effective stopping power and overall flight operation.

Maintaining the pressure within this threshold helps to ensure that the brakes are responsive and functional, which is particularly important during critical phases of flight, such as takeoff and landing. While the other values provided could be related to different systems or operational parameters, they do not align with the specified operating limits for the power brake pressure gauge in this context. Therefore, understanding the significance of the correct pressure range and how it contributes to safe aircraft operation is vital for pilots.