It should be 10mm. But do not use a 12 point box wrench, use only a six point or a 10mm gas line wrench, as the 12 point tends to spin around the bleeder, rounding it off.
43sqd, do they sell the bleeder screw separately? If they do, I will buy 4 extra screws and keep in the truck. Next time when I do brakes, I will flush the brake fluid and replace all those 4 screws.
1. Add brake fluid to the Motive Power Brake Bleeder tank.
2. Firmly connect the supplied adapter to brake master cylinder and pump the Motive Power Brake Bleeder to pressurize.
3. Starting with the furthest away brake bleeder valve (typically on the rear of the vehicle), open brake bleeder valve and purge the air and old brake fluid from your brake system.
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