Here are JMP's new Brake Valves plus 1-Circuit Retract Valve and our Brake Valve plus 2-Circuit Retract/Door Valve. The Proportional Brake Valve will activate most wheel brake designs in use today. To work best your Brake servo should have at least 100 in.oz. of torque. We use a JR 8711HV servo for this. The Brake Valve requires about .5 inches of stroke to operate from zero to full system pressure. Lesser servos will work but will buzz more when applying maximum braking. As you increase the system pressure, it requires progressively more servo torque to deliver this pressure to the wheel brakes.
The gear and door spools are our standard Hi-Flow design with the gear circuit using machined fittings and aluminum air line locknuts. Just set servo end points to push the spools from end stop to end stop to retract the gear or close the doors.
We have several fitting sizes available for custom installations. The stock setup uses 1/8" air line fittings on the Brake Valve circuit. The Door circuit uses 1/8" fittings. The Retract Gear circuit uses 4mm fittings with air line locknuts.