Trail Gear' s Rear Disc Kit ha a 3/8in. thick laser cut caliper bracket with grade 10.9 mounting bolts fro a super strong mounting system. Trail Gear uses the larger GM style calipers that are shipped fully loaded and include GM style vented rotors that were custom made just for this application. The DOT approved brake lines are made so that one end fits the GM calipers and the other end attaches to your OEM Toyota brake lines, so no new fittings are required. This kit does require either a 2 lb. residual valve or the ever popular 1in. bore master cylinder that most pick ups and 4Runners have already had upgraded. Also included with this kit are full color install instructions.