Patent ID: 6866348

Claim:
A hydraulic braking system for supplying a braking output to a vehicle having at least one wheel, the braking system comprising: (a) a primary valve assembly configured to receive a manually controlled input that varies the braking output, the primary valve assembly including: (i) a first spool valve configured to vary the braking output according to the manually controlled input; and (b) a secondary valve assembly integral with the primary valve assembly, the secondary valve assembly being configured to receive input signals from a programmable electronic controller, the secondary valve assembly including: (i) a second spool valve configured to operate with the primary valve assembly; and (ii) an actuator for engaging and actuating the second spool valve according to the input signals received from the programmable electronic controller such that the second spool valve assists the braking output produced by the primary valve assembly; (c) wherein the braking output of the system includes a first braking output and a second assisted braking output, and wherein the system is configured to provide each of the first braking output and the second assisted braking output at the same manually controlled input.