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A disk brake system for original equipment or retrofit installation in a wheelbarrow or hand truck uses a disk rotor and a caliper bracket both mounted to the wheel or axle, so as to provide the disk brake pads of the caliper with a fixed position relative to the disk rotor. The caliper bracket is s

A disk brake system for original equipment or retrofit installation in a wheelbarrow or hand truck uses a disk rotor and a caliper bracket both mounted to the wheel or axle, so as to provide the disk brake pads of the caliper with a fixed position relative to the disk rotor. The caliper bracket is stabilized by a separate U-shaped mounting bracket, or by one or more mounting arms affixed to the caliper bracket, which are secured to one handle.

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1. In a wheelbarrow having two handles and a wheel assembly near a forward end of said two handles, said wheel assembly including an axle, and at least one wheel mounted on said axle, and axle mounting brackets mounted to said two handles and holding said axle, an improvement comprising:a wheelbarro

1. In a wheelbarrow having two handles and a wheel assembly near a forward end of said two handles, said wheel assembly including an axle, and at least one wheel mounted on said axle, and axle mounting brackets mounted to said two handles and holding said axle, an improvement comprising:a wheelbarrow disk brake assembly, comprising: a caliper bracket having an axle hole for receiving said axle and thereby mounting said caliper bracket to said axle, and one or more support arms extending away from said axle, said caliper bracket being retained by at least one mounting arm attached to one of said two handles and positioned thereby in a desired orientation, said at least one mounting arm being provided in a separate mounting bracket having two spaced apart mounting arms, said caliper bracket being received between said two spaced apart mounting arms of said separate mounting bracket; a brake caliper assembly mounted to said caliper bracket at a selected distance from said axle hole of said caliper bracket, said brake caliper assembly including an actuator and opposing brake pads; and a disk rotor mounted to said axle or wheel cylindrical portion of said wheelbarrow, said disk rotor having a central opening and a diameter selected such that a peripheral area of said disk rotor is positioned within said brake caliper assembly between said opposing brake pads.