Disconnect the wiring harness from the fluid level sensor and unscrew the two nuts securing the master brake cylinder (see Removal the master brake cylinder).
In the cabin, under the dashboard..
...we use a screwdriver to pry up the spring retainer of the finger that attaches the vacuum booster pushrod to the brake pedal (for clarity, the instrument panel and steering column have been removed)…
…and we take it off.
We remove the finger from the pedal holes and the pusher eye.
Using pliers, loosen the clamp securing the vacuum supply hose from the intake manifold to the vacuum booster..
…and remove it from the fitting.
Carefully bend the brake pipes without disconnecting them from the master cylinder, so that air does not get into the hydraulic drive of the brake system..
…we move the main brake cylinder (complete with tank) from the vacuum booster housing.
The connection between the master cylinder and the brake booster is sealed with a rubber gasket (see Removal the master brake cylinder).
We remove the rubber gasket from the vacuum booster hole and check its technical condition.
If necessary, replace the gasket with a new one.
Using a 12 mm spanner, unscrew the four nuts securing the vacuum booster housing to the brackets (the fourth nut is not visible in the photo).
We remove the booster pusher from the hole in the front shield... ...and remove the vacuum booster from the engine compartment.
We remove the corrugated protective cover from the pusher.
We check the size between the axis of the pusher hole and the mating surface of the vacuum booster, which should be 278.5 mm.
To get the right size…
…with a 14 mm wrench, unscrew the lock nut while holding the adjusting sleeve of the pusher with a 13 mm wrench.
By rotating the sleeve we achieve the required size, after which we tighten the lock nut.
If there is a need to inspect or replace the tappet…
... using pliers we remove the spring retainer from the groove of the sleeve..
…and we take out the pusher.
We install the brake booster in the reverse order.