So, you need to stop? Of course! Those bigger tires, old wheel cylinder and drum designs just aren’t up to the task. So, we have teamed our Front and Rear disc brake kit along with our 4 Wheel Disc Brake Master Cylinder for a kit that is a complete swap over to help you slow it down. This kit was designed for use on 8/70 to 9/75 FJ40 or 55 (may work on early years but brake line fittings are different, 9 mm, and you will need a dual circuit hydraulic system).