A mobile saw stand brake system incorporates a pair of swing-out legs pivotally connected to a saw stand main frame. A first end of the main frame is supported on a pair of rotating wheels. A pair of brake lever arms, each having a brake shoe end and a distal actuating end, are pivotally connected to the main frame. A tension mechanism is interconnected with the pair of swing-out legs so as to actuate the brake lever arms to engage the wheels when the legs are extended in their swing-out position. The brakes are disengaged when the swing-out legs are folded into a stowed position.