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| Illustration 1 | g03734075 |
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Section view of the front brakes | |
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| Illustration 2 | g03734076 |
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Section view of the rear brakes | |
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| Illustration 3 | g06327811 |
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Typical rear view of the front right service and parking brake (A) Pressure tap for the service brakes and retarder (B) Oil passage for the parking and secondary brakes (C) Inlet passage for brake cooling oil (D) Oil passage for the service brake and retarder (E) Outlet passage for brake cooling oil | |
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| Illustration 4 | g06327552 |
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View A-A (1) Brake Anchor (2) Duo-Cone seals (3) Front wheel (4) Front spindle | |
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| Illustration 5 | g06328407 |
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View CC (1) Brake Anchor (5) Piston for the parking and secondary brakes (6) Oil chamber for the oil that releases the parking brakes (7) Discs (8) Plates (9) Piston for the service brake and retarder (10) Oil chamber for the service brake and retarder | |
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| Illustration 6 | g06328501 |
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View of brake springs (11) Spring for parking brakes (12) Spring for parking brakes (13) Spring Guide (14) Spring for the service brake and retarder | |
Front wheel (3) is connected to spindle (4) with two taper roller bearings. Brake anchor (1) is connected to spindle (4) and does not turn. Plates (8) do not turn. Discs (7) turn with front wheel (3).
Brake cooling oil flows into oil passage (C) and the brake cooling oil cools discs (7) and plates (8). Then, the brake cooling oil flows through outlet passage (E). The brake cooling oil returns to the hydraulic tank.
Use pressure tap (A) to remove air from the hydraulic system for the service brakes. Use the plug-in oil passage (B) to remove air from the hydraulic system for the parking brakes.
The parking brakes are applied by springs and released by oil pressure. When the parking brakes are engaged, pump pressure is not sent to oil passage (B). Oil pressure is not sent to oil chamber (6). Springs (11) and (12) push piston (5). Piston (5) pushes piston (9). Piston (9) pushes discs (7) and plates (8) together. When discs (7) and plates (8) are held together, friction occurs. The friction prevents wheel assembly (3) from rotating.
When the parking brakes are released, pump pressure is sent to oil passage (B). Then, oil flows into oil chamber (6). The pressure oil forces piston (5) to compress springs (11) and (12). Spring (14) and spring guide (13) pull piston (9) away from discs (7) and from plates (8). Discs (7) and plates (8) will not be in contact and the parking and secondary brakes will be released.
When the service brake or the retarder is applied, oil pressure flows to oil passage (D). Then, oil flows into oil chamber (10). As the oil pressure increases, piston (9) pushes discs (7) and plates (8) together and friction occurs. The friction causes the rotation of front wheel (3) to slow. A continued application of the service brake or the retarder stops the rotation of front wheel (3).
When the service brakes are released, oil pressure does not flow into oil passage (D) or oil chamber (10). Spring (14) and spring guide (13) pull piston (9) away from discs (7) and from plates (8). Discs (7) and plates (8) will not be in contact and the service brakes will be released.