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Removing and installing piston brake caliper
Withdrawal Rotate the axis in the direction of the arrow using a socket wrench T45.
| Fig. 6.34. Squeezing the piston by allen key T45
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Locknut squeeze out the piston from the brake caliper (Fig. 6.34). Remove the protective cap from the piston from the brake caliper.
Setting Surface of the piston and O-rings clean only alcohol and then dried. Before installing the piston and apply a thin coat of o-ring assembly paste G 052 150 A2. Insert O-ring in the brake caliper.
Turn the lock nut on the axle until it reaches the value of A 15 mm (Fig. 6.37).
| Fig. 6.38. Setting the working edge of the protective cap with a wedge into the groove in the brake caliper
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Insert the inner lip of the protective cap with a wedge into the groove in the brake caliper (Fig. 6.38). Click on the piston locknut, this is only possible in four positions. Gently pressed in a piston brake caliper, while the piston move.
Push the plunger in the brake caliper so that it is pressed against the lock nut (Fig. 6.39).
Gently turn the axle clockwise until the nut is not screwed up to the stop (Fig. 6.40).
| Fig. 6.41. The installed position of the protective cap
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Make sure that the cap rests on the brake caliper around the perimeter (Fig. 6.41).
| Fig. 6.42. Forcing the piston in the brake caliper
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Thus the outer sealing lip of the protective cap enters the groove on the piston.
Checking the check valve
The air must pass through the check valve in the direction of arrow A (Fig. 6.43). In the opposite direction the valve should remain closed. Watch out for the correct mounting position.
Removing and installing brake servo pressure sensor Remove the engine cover. Remove the vacuum hose with a pressure sensor for brake booster from the brake booster.
Carefully pry downward pressure sensor for brake booster 2.
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