1. Relieve all feedback hydraulic pressure by depressing the brake pedal with the engine off about twenty times.
2. Remove the master cylinder as described in Chapter 13.
3. Place a container under the booster block, then loosen the union nuts and disconnect the supply and return pipes. Seal the ends of the pipes.
4. Disconnect the electrical wiring from the differential pressure indicator, unscrew the switch from the amplifier block. Remove the puck.
5. From inside the vehicle, disconnect the return spring from the brake pedal and booster push rod clamp. Remove the bracket, remove the pin.
6. Remove the mounting nuts securing the booster block to the pedal hanger and baffle.
7. Get the block of the amplifier in a motor compartment. Remove the pad.
8. Before installing the block, check the size of the pusher rod, guided by fig. 9.32. If necessary, loosen the locknut, reinstall the clamp, then retighten the locknut.
9. Installation is carried out in the reverse order. Use a new gasket and tighten all nuts and bolts to the specified torque specification. Finally, top up the tank with the specified fluid (cm. Section 10 if necessary). Place the front wheels straight ahead and run the engine at idle speed for approximately two minutes. Switch off and immediately check the liquid level in the tank. Pad to the maximum mark, if necessary.
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