Doing a drum brake job and want to get it right the first time? This GEARWRENCH 3377 tool is a lifesaver. It's basically a set of specialty calipers designed for one specific task: setting the proper clearance between your new brake shoes and the inside of the brake drum before you put everything back together. Here's how it works: you use the inside jaws to measure the exact inside diameter of your brake drum (anywhere from 6.5 inches to 14.25 inches). Then, you lock the measurement with the knurled knob and use the outside jaws to transfer that exact measurement to your brake shoes, bending the adjuster star wheel until the shoe matches the gauge. It's calibrated in both 1/32 inch and 1mm increments for precision. This simple tool saves you from the annoying trial-and-error of assembling the drum, finding it's too tight, disassembling, adjusting, and repeating. It's a pro trick that makes DIY brake jobs way faster and more accurate. A must-have for anyone working on older cars or trucks with drum brakes.
