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  • Patrol Brake System

    I have been looking into the details of a Patrol brake system with co-pilot brakes and parking brake valve. This might be helpful for the next person trying to compile an order. I also appreciate any constructive feedback.

    Here is what I know:
    • 3/16" 5051 aluminum tubing with AN -3 fittings are typically used
    • connections to movable parts require flexible lines
      • lines to master cylinders
      • line across gear leg hinge
      • line from gear leg to caliper may be done with 5051
    • flexible lines are typically Aeroquip 303 (black cloth sleeve) or 666 (stainless sleeve)
      • 666 is lighter than 303
      • Teflon/PTFE hose material has no limited shelf-life like rubber
    • ACS has a configurator ($60-100 per line)
    • alternatively, automotive high performance lines can be used ($15 per line)
    Looking at the parts list for both I think using flex lines all the way makes a lot of sense. Everything is very close together and patching all the way through actually does not add much cost. In the following I sketched out both approaches.


    ​​
    • (for MI-H-5606 hydraulic fluid)
    • 1x grove reservoir
    • 4x gerdes master cylinders
    • 2x grove dual calipers
    • 1x matco parking brake
    • 12x flex line
    • AN fittings size 3, 3/16"
      • 11 x AN816-3D (flare to 1/8" NPT, reservoir, cylinders, valve)
      • 1x AN825-3D (flare to flare, reservoir tee)
      • (use AN834-3D + AN924-3D for mounting into firewall)
      • 4x AN822-3D (flare to 1/8" NPT 90°, valve output, caliper)
      • 2x AN833-3D (flare to flare, 90°, bulkhead, gear leg hinge)
      • 2x AN924-3D (nut for bulkhead AN fitting)
      • 17x AN819-3D (fitting sleeve)
      • 17x AN818-3D (fitting nut)


    For comparison the same setup mostly built from flex lines:

    • (for MI-H-5606 hydraulic fluid)
    • 1x grove reservoir
    • 4x gerdes master cylinders
    • 2x grove dual calipers
    • 1x matco parking brake
    • 10x flex line
    • AN fittings size 3, 3/16"
      • 11 x AN816-3D (flare to 1/8" NPT, reservoir, cylinders, valve)
      • 1x AN825-3D (flare to flare, reservoir tee)
      • (use AN834-3D + AN924-3D for mounting into firewall)
      • 4x AN822-3D (flare to 1/8" NPT 90°, valve output, caliper)
      • 2x AN833-3D (flare to flare, 90°, bulkhead, gear leg hinge)
      • 2x AN924-3D (nut for bulkhead AN fitting)
      • 2x AN819-3D (fitting sleeve)
      • 2x AN818-3D (fitting nut)
    Last edited by noema; 01-13-2021, 02:10 PM.
    Bearhawk Patrol, O-360, Trailblazer 80", 26" Goodyear, Stewart Systems
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