| This is a Hurst Roll Control line lock. Drag racers use them to lock the front brakes when they stage at the line. In a truck with a manual transmission the line lock eliminates the need for three feet in order to make a smooth start when stopped on a steep incline or in the middle of a sick obstacle. It was very, very helpful in Clayton. Todd Hoffmaster was invaluable during the installation as phone based tech support and general hand holding. My installation was complicated by originally having antilock brakes and needing to plumb into the ABS block. I bought new lines with Toyota flares to go into the antilock block, cut them to length, and double flared the cut end to fit the American fittings on a T fitting then plumbed the T to the Roll Control. I had better luck double flaring the hard stock tubing going to the calipers so it was retained. |  |
| There is a momentary switch mounted to the shifter that holds pressure on the front brake lines after your foot has been removed from the brake pedal. You can also pump more pressure into the lines while holding down the switch for a better lock. As per Todd's suggestion I wired my rear diff lock switch in parallel with the momentary so I can lock the brakes and get out of the truck. It is unused with the Detroit and it's construction/location makes it unlikely the dog will get to it. Since it's reliability is only as good as the wiring I soldered the connections and wired it directly to the battery. I'm considering replacing The momentary switch on the shifter is made of cheesy plastic which causes it to buzz horribly during acceleration. I've taken it apart and put small bits of open cell foam in the switch body which helps a lot with the buzzing but I'm still considering replacing it with something a little more solid. |  |