We remove the cylinder from the studs and take it down, carefully bending the brake pipes so as not to damage them.
We take out the check valve from the rubber seal in the hole in the amplifier housing.
In the cabin, use a screwdriver to pry off the lock washer of the finger of the pusher of the vacuum booster to the brake pedal. (Steering column covers removed for clarity).
Removing the lock washer..
... and take out the pin of the pusher to the pedal.
head «at 13» unscrew the four nuts securing the brackets of the vacuum booster and the pedal assembly to the front end shield of the body.
We remove the booster pusher from the hole in the bulkhead and remove the vacuum booster assembly with the bracket from the engine compartment.
Removing the rubber seal..
... sealing glass..
...and sealant.
head «at 17» unscrew the two nuts securing the vacuum booster to the bracket.
Separate the bracket and amplifier.
Install the brake booster in reverse order. When installing the check valve, we moisten it and the seal with a penetrating liquid such as WD-40.
The protrusion of the head of the adjusting bolt of the vacuum booster relative to the mounting plane of the flange of the main brake cylinder should be 1.25–0.2 mm. (The brake master cylinder has been removed for clarity.)
To adjust the protrusion of the bolt head, we hold the end of the rod with pliers, and with a key «on 7» rotate the bolt.
With the engine off, adjust the free travel of the brake pedal.
To do this, in the cabin with a key «at 19» loosen the locknut of the brake light switch, holding it with a wrench «at 14».
Turning the brake light switch (with disconnected wires), install it so that its buffer rests against the pedal stop, and the pedal free play is 3–5 mm. In this position, tighten the locknut.
To remove the brake light switch..
... disconnect the wires from it,..
... the key «at 19» open buffer..
...and take it off.
Loosen the lock nut..
... the key «at 14» unscrew the brake light switch from the bracket of the pedal assembly..
... and take out the switch.
Install the brake light switch in reverse order and adjust the pedal free play.