In the wet surfaces position, what should the front brake chamber pressure be relative to the foot valve pressure?

In the wet surfaces position, the front brake chamber pressure should be set to half of the foot valve pressure. This is designed to reduce braking force by limiting the pressure supplied to the brakes, minimizing the risk of wheel lock-up in slippery conditions. It helps maintain control and stability of the vehicle when driving on wet surfaces, which could otherwise lead to skidding or loss of traction.

This pressure adjustment is essential for maximizing safety during adverse weather conditions by providing a more gradual application of brake force. The reduced pressure allows for better modulation of brakes, enabling the driver to maintain control while stopping or slowing down.