Locate the both of the brakes and the four long screws.

Place the brake behind the front frame right above the castor wheels

The brake with the yellow nob goes on the right side of the chair, and the brake with the black nob goes on the left.

Screw both of the screws into the bottom two holes in the frame using a 10 mm wrench to hold the nut . Then, use the T-Wrench to fasten the screws.

You can use a power drill instead of a T-Wrench to speed up the process.