A few years back, I did the brake upgrade to my 4Runner. Installed new V6 calipers and the MC and dual diaphragm brake booster from a 90Æs V6 truck. Running 31ö tires, I could stop just a quick as any above average car. Now I run 4 wheel disks (LC rotors and 4 cyl calipers on the rear with LC MC) and can stop even better with 35ö tires.

The only reason to upgrade the MC is if you are increasing the amount of fluid to the brakes. Going to larger V6 calipers, rear disk brakes, etc. It would also be a good time to switch to a dual diaphragm booster.

If you plan to do disk brakes in the rear, go with the LC MC (92 non ABS) and a dual diaphragm booster. If you are going to stick with drum brakes in the rear, go with the V6 MC and a dual diaphragm booster and upgrade to the V6 calipers.

Adam W.
87 4Runner SR5 - 22RE w RV head & TRD Cam, LCE header, W56B-HD, 4" Stage II, 1.5" BJS, Rancho T-bars, F 5.29, R 5.29 ARB V6 FF w LC disks, 35" MT/R's

85 4Runner frame, 5" Marlin springs, 5:29 ARB HP front. Work in progress - Always!