Usage:
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Open the drain valve on the air tank and remove the pressure from the air system before any lines are disconnected. |
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NOTE: The right brake control valve is shown, use the same procedure for the left brake control valve.
1. Put identification on electric wires (1) as to their location and disconnect them from the solenoid.
2. Disconnect the four air lines (3), (4), (5) and (one not shown) from valve assembly (2).
3. Remove the pin that holds pin (7). Remove pin (7) and treadle assembly (6).
4. Remove boot (9) from the valve assembly. Remove the three bolts (8) and remove the valve assembly from the bottom of the floor plate.
Install Brake Control Valves
1. Put valve assembly (1) in position and install the three bolts that hold it in position.
2. Connect air lines (2) and (3) to valve assembly (1).
3. Connect the electric wires to their correct location on the solenoid.
4. Install the boot on the valve assembly.
5. Put treadle assembly (5) in position and install pin (4). Install the pin that holds pin (4).
6. Start the engine and inspect the system for leaks.
Disassemble Brake Control Valves
start by:
a) remove brake control valves
NOTE: Steps 1, 2 and 3 are for the right side brake control valve only.
1. Remove stop light switch (4) and the fitting from double check valve (2). Remove check valve (1) and double check valve (2) from valve body (3).
2. Remove cap (5), spring (8), disc (6), seat (9) and washer (7) from the check valve.
NOTE: The parts of check valve (1) can not be ordered separately. If the parts have wear or damage a replacement of the valve is necessary.
3. Remove cap (12), gasket (11), retainer and seat assembly (10) from the double check valve.
4. Remove retainer (13) from valve body (3).
5. Remove piston assembly (14) and spring (15) from brake valve body (3).
6. Remove O-ring seal (19), bolt (17), washer (18), seat (16) and spring (not shown) from piston body (20).
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Spring on valve assembly (23) is under compression. |
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7. Turn the brake valve body over as shown. Remove ring (21) with tool (A). Remove washer (22) and valve assembly (23).
8. Twist valve (28) and pull it away from seat (24). Remove spring (30), retainer (29) and O-ring seal (not shown) from valve (28).
9. Remove screw (26), washer (25), diaphram (27) and spring (not shown) from seat (24).
Assemble Brake Control Valves
1. Clean all metal parts in nonflammable solvent.
2. Install spring (6), diaphram (7), the washer and screw (8) in the large end of seat (5).
3. Install retainer (2), O-ring seal (3) and spring (4) on valve (1). Push the valve in the small end of seat (5) until spring (6) holds the valve in the seat.
4. Install O-ring seal (10) and valve assembly (9) in brake valve body (11). Put the washer in position and use tool (A) to install the ring that holds valve assembly (9) in position.
5. Install rubber spring (13), seat (14), the washer and bolt (15) in piston body (12). Install O-ring seal (16) on the piston body.
6. Install spring (17) and piston assembly (18) into brake valve body (11).
7. Push down on the piston assembly and install retainer (19).
8. Install retainer and seat assembly (20), gasket (21) and cap (22) in the double check valve.
9. Install washer (25), seat (27), disc (24), spring (26) and cap (23) in the check valve.
10. Install double check valve (29) on valve body (11). Install stop light switch and the fitting on double check valve (29).
11. Install check valve (28) on double check valve (29).
end by:
a) install brake control valves