Work control
1. With the engine off, press the brake pedal several times, unload the booster.
2. Step on the pedal and start the engine. If the pedal moves down easily, the amplifier is working normally.
3. Let the engine run for about two minutes and turn it off. Slowly press the brake pedal several times. If the pedal travel increases with each press, there are no leaks in the amplifier.
4. Depress the pedal while the engine is running. Stop the engine without releasing the pedal. If the pedal has not changed its position within 30 seconds, the amplifier is in order.
Withdrawal
5. The brake booster is a non-separable unit. If the amplifier fails, replace it with a new one.
6. Remove the brake master cylinder (see Section 7).
7. Locate the connection between the brake pedal and booster (see fig. 8.1): It is located under the dashboard opposite the driver's seat.
8. Remove the pin cotter pin and remove the pin.
9. Holding the earring with pliers, disconnect the lock nut, remove the earring.
10. Disconnect the hose from the engine to the booster. Be careful not to damage the hose and booster fitting.
11. Turn off four nuts of fastening of the amplifier to a wall of a motor compartment.
12. Remove the amplifier, bracket and gaskets.
Installation
13. The installation order is basically the reverse of disassembly. Tighten the earring nut and the booster mounting nuts.
14. After installing the amplifier, it is required to adjust the gap between the pusher and the piston of the main brake cylinder. Measure the distance between the piston seat of the cylinder and the plane of the mounting flange. Apply a vacuum of 20 mm Hg to the amplifier. Art. and measure the distance between the booster pusher and the installation plane of the master cylinder (including gasket). Compare the data of two measurements and get the required clearance (see fig. 11.14a). If the clearance is greater or less than the recommended (see specification). loosen the locknut and adjust the clearance (see fig. 11.14b). Tighten locknut after adjustment.
Pic. 11.14a To measure the gap in a pair of booster pusher / piston of the main brake cylinder
Pic. 11.14b Gap adjustment
15. After installing the booster and master cylinder, bleed the brake system (see Section 10).