According to still another feature, the brake linkage means include a hydraulic brake master cylinder, a brake master piston slidably disposed in the brake master cylinder, and multiple hydraulic brake lines fluidly connecting the brake master cylinder with multiple hydraulic lock units for actuating the fluid flow control pistons in a plurality of hydraulic brakes in response to operation of the brake actuator. This feature causes equalization of the fluid pressure in all commonly connected flow control pistons of the brake pumps.