AP42.50-D-4280B | Hydraulic brake system - replacing brake fluid | 8.3.07 |
MODEL 667, 668, 670 with ENGINE 602
MODEL 668, 670 with ENGINE 904
MODEL 668, 670 with ENGINE 900.9
N42.50-2015-01
Shown on air-operated brake system
1a Expansion reservoir for rear axle brake circuit
1b Expansion reservoir for front axle brake circuit
N42.50-0209-01
Shown on vacuum-assisted brake system
1 Expansion reservoir
N42.50-0206-01
2 Bleed screw
N42.50-0207-01
N25.20-0212-01
Shown on clutch slave cylinder with vacuum-assisted brake system
3 Bleed screw
Danger! | Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes | Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid. | |
| Brake fluid notes | All models | |
1 | Identify the fluid level in the expansion reservoir (1,1a,1b) with an adhesive strip (e.g. insulation tape) | If after replacing the brake fluid the expansion reservoir (1,1a,1b) is filled beyond the current level, there is the danger that it is overfilled or overflows when replacing the brake pads, for example. | |
2 | Extract brake fluid in the expansion reservoir (1,1a,1b) | Extract brake fluid in the expansion reservoir (1) until there is a residual amount of approx. 10 mm. | |
Both expansion reservoirs (1a, 1b) should be emptied on the air-operated brake system. | |||
3 | Connect bleeder unit to expansion reservoir (1) | With vacuum-assisted brake system Pay attention to manufacturer's operating instructions. | |
4 | Move the automatic brake force regulator into the full-load position | With vacuum-assisted brake system | |
5 | Connect drain hose to the bleed screw (2) | With vacuum-assisted brake system Connect drain hose of the brake fluid receptacle to the bleed screw (2) on the brake caliper. | |
Start the replacement of the brake fluid at the brake caliper with the longest line. | |||
6 | Open, close bleed screw (2) | With vacuum-assisted brake system Keep the bleed screw (2) at each brake caliper open until new brake fluid flows out free of bubbles, then close the bleed screw (2). | |
Brake fluid | |||
7 | Connect drain hose to the bleed screw (3) | Connect the drain hose of the brake fluid receptacle to the bleed screw (3) on the clutch slave cylinder. | |
8 | Open, close bleed screw (3) | Keep the bleed screw (3) on the clutch slave cylinder open until new brake fluid flows out free of bubbles, then close the bleed screw (3). | |
9 | Return automatic brake power regulator to original position | With vacuum-assisted brake system | |
10 | Disconnect bleeder unit | With vacuum-assisted brake system Observe manufacturer's operating instructions. | |
11 | Correct fluid level in expansion reservoir (1) | With vacuum-assisted brake system Bring the fluid level to the marked level before replacing the brake fluid. | |
12 | Connect the bleeder unit to the expansion reservoir (1a) of the rear axle brake circuit first, then connect to the expansion reservoir (1b) | With air-operated brake system Replace the brake fluid in the rear axle brake circuit first, then in the front-axle brake circuit. | |
Pay attention to manufacturer's operating instructions. | |||
13 | Connect drain hose to the bleed screw (2) | With air-operated brake system Connect drain hose of the brake fluid receptacle to the bleed screw (2) on the brake caliper. | |
Start the replacement of the brake fluid at the brake caliper with the longest line. | |||
14 | Open, close bleed screw (2) | With air-operated brake system | |
Keep the bleed screw (2) at each brake caliper open until new brake fluid flows out free of bubbles, then close the bleed screw (2). | |||
Brake fluid | |||
15 | Disconnect bleeder unit from expansion reservoir (1b) of front-axle brake circuit | With air-operated brake system | |
Observe manufacturer's operating instructions. | |||
16 | Correct the fluid level in the expansion reservoirs (1a,1b) | With air-operated brake system | |
Bring fluid level to the marked level before replacing the brake fluid in both expansion reservoirs (1a,1b). | |||
17 | Attach sticker in engine compartment | Attach sticker for service deadline reminder for the next brake fluid change at a clearly visible point in the engine compartment. |
Brake system
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