Contents: Checking the brake fluid level ↡ Replacing brake fluid ↡ Checking the thickness of brake pads ↡
Checking the brake fluid level
1. Check the brake fluid level in the reservoir. It should be between the "MIN" and "MAX" marks (slightly above the "MIN" mark) (see figure 1.37). If the level constantly drops below the "MIN" mark, check for leaks in the brake system and, if found, eliminate them. Check the tightness and condition of all tubes and hoses. Check the condition of the tank, pneumatic and hydraulic units.
Figure 1.37. Checking the brake fluid level.
Attention! Do not fill the fluid level in the reservoir above the "MAX" mark, this will lead to excessive wear of the brake linings.
2. Adjust the fluid level.
Replacing brake fluid
3. Mark the fluid level in reservoir 1 using adhesive tape. If the reservoir is completely filled after changing the brake fluid, there is a risk of overflow or overfilling, for example after replacing the brake pads.
4. Reduce the brake fluid level in the reservoir by approximately 10 mm.
5. Attach the drain hose (arrow) (see figure 1.38).
Figure 1.38. Connect the drain hose (arrow) to the tank.
6. Set the automatic brake force regulator to the full load position.
7. Connect drain hose 2 to the brake caliper (see figure 1.39).
8. Loosen the drain bolt on each caliper until fresh fluid begins to flow out without air bubbles.
Figure 1.39. Connect the drain hose to the brake caliper.
9. Replace the brake fluid in the clutch reservoir using bolt 3 (see figure 1.40). Loosen the drain bolt until fresh fluid starts to flow out without air bubbles.
Material taken from a web resource www.mercedesman.ru
Figure 1.40. Replace the brake fluid in the clutch reservoir.
10. Set the automatic brake force regulator to its initial position.
11. Disconnect the drain hoses.
12. Adjust the fluid level in the tank.
Checking the thickness of brake pads
Single tires
13. Check the thickness of the brake linings through the hole in the wheel disk (see figure 1.41). Insert the feeler gauge into the hole until it stops and measure the thickness of the pad. The maximum permissible wear is 3 mm.
Figure 1.41. Checking the thickness of the brake linings (single tires).
Twin tires
14. Check the position of marks A and B on the brake caliper when rotating relative to edge C (see figure 1.42). A - new gasket, B - remaining gasket about 5 mm. This test is only a rough check. If mark B approaches mark C, it is necessary to check by removing the wheel.
Figure 1.42. Checking the thickness of the brake linings (dual tires).