Patent ID: 6874857

Claim:
A brake system for a traveling vehicle having at least two traveling wheels driven by a single hydraulic pump through respective hydraulic motors, comprising: a parking brake for applying braking force to all of said at least two traveling wheels when the hydraulic pump is not driven or the hydraulic pump does not provide sufficient hydraulic pressure to the hydraulic motors; at least two auxiliary brakes, each auxiliary brake applying braking force to only one of the traveling wheels independently of the parking brake, the braking force being provided directly to a rotational portion of the corresponding hydraulic motor; at least two rotation detectors, each rotation detector detecting rotational speeds of the respective traveling wheels; and a computer connected to the rotation detectors for comparing the rotational speeds of the traveling wheels, wherein the computer controls one of the auxiliary brakes to apply a braking force selectively to the corresponding traveling wheel based on a result of the comparison.