Examination
1. Depress the brake pedal several times and start the engine. The pedal should go down a little. Let the engine run for a few minutes and shut it down. Press the brake pedal, it should have normal stiffness. After a few clicks, the pedal should become much stiffer.
2. If the vacuum booster does not work as described above, check the vacuum valve and, if necessary, the vacuum pump.
3. If the vacuum valve and pump are OK, replace the vacuum booster.
Withdrawal
1. Remove the master brake cylinder.
2. Disconnect the vacuum hose.
3. Disconnect the vacuum booster pusher from the brake pedal.
4. Unscrew the fixing nuts and remove the vacuum booster.
Installation
1. Before installation, check that the distance from the center of the hole in the pusher fork to the surface of the amplifier is 230±0.5 mm ("A"). Tighten the pusher fork, if necessary.
2. Installation is carried out in the reverse order of removal.
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