6.5. Vacuum amplifier

Description of the device

Fig. 6.2. The main brake cylinder with the vacuum amplifier: 1 – case cover; 2 – connecting ring; 3 – diaphragm; 4 – case basis; 5 – basic ring of a diaphragm; 6 – basic plate of a disk; 7 – sector of a basic disk of a diaphragm; 8 – the fixing washer of sectors; 9 – central valve; 10 – the directing piston ring; 11 – sealing cuff of the case of the piston; 12 – lock washer of a sealing cuff; 13 – piston case; 14 – clamping plug of a support of a pusher; 15 – air filter; 16 – piston pusher; 17 – adjusting screw; 18 – piston emphasis; 19 – locking ring of a diaphragm; 20 – returnable spring of the piston; 21 – persistent bracket; 22 – rod of the amplifier; 23 – returnable spring of sectors; 24 – adjusting bolt; 25 – backpressure valve; 26 – tank of the main cylinder; 27 – tank cover; 28 – tube of the connecting plug; 29 – connecting plug; 30 – persistent pin; 31 – piston of the second camera; 32 – returnable spring of the piston of the second camera; 33 – persistent washer of a cuff; 34 – main cuff; 35 – piston valve; 36 – case of the main cylinder; 37-dividing cuff of cameras of the main cylinder; 38 – returnable spring of the piston of the first camera; 39 – piston of the first camera; 40 – sealing ring; 41 - cap; And – the first camera; In – the second camera; With – a compensation opening


The vacuum amplifier installed between the mechanism of a pedal and the main brake cylinder when braking due to depression in the soaking-up engine pipe through a rod 22 (see fig. 6.2) on the piston 39 of the first camera of the main cylinder creates the additional effort proportional to effort from a pedal.
The case of the vacuum amplifier consists of the basis 4 and the covers 1 connected among themselves by a connecting ring 2 and is divided into two cameras by the piston of diaphragm type consisting of the steel sectors 7 condensed with a rubber diaphragm 3. The backpressure valve 25 on a cover of the case connects a cavity under a cover to the hose going to the soaking-up engine pipe and interferes with hit of petrol mix in the vacuum amplifier.
The backpressure valve holds depression in the amplifier when falling depression in the soaking-up engine pipe. In the forward camera supplied with the backpressure valve 25 constant depression is supported.
Extent of depression in the back camera is regulated by the valvate mechanism. It consists of ring ledges at an end face of the case 13 of the piston and central rubber valve 9.
Sectors 7 under the influence of efforts from the case of the piston and pressure of air upon a diaphragm from the second camera turn around a basic plate 6, influencing the central valve 9.
The basic plate 6 perceives effort of the piston and through a rod 22 transfers him to the piston 39 of the first camera of the main cylinder. The mutual provision of details of the valvate mechanism is defined by position of the adjusting screw 17 by means of which the moment of overlapping of the channels connecting both cameras is regulated. For providing the guaranteed gap between a rod of the amplifier and the piston of the main cylinder the design of a rod provides adjustment by means of an adjusting bolt 24 which screwing up increases the specified gap.

Replacement of a cuff of the case of the piston of the vacuum amplifier
1. Rasshplintuyte a finger also disconnect a pusher fork from a brake pedal.
2. Remove a protective cover.
3. Take out a lock washer 12 (see fig. 6.2) and a sealing cuff 11.
4. Clear pure gasoline the external surface of the case 13 of the piston.
5. Grease the external surface of the case 13 of the piston and a sealing cuff with the 11th TsIATIM-221 lubricant (State standard specification 9433-80).
6. Insert a sealing cuff 11 into the basis 4 cases and record it a lock washer 12.
7. Implant a finger into a fork of a pusher and a pedal of a brake and its zashplintuyta.

Removal and installation of the vacuum amplifier
1. Turn off two nuts of fastening of the main cylinder to the amplifier and take him aside, without disconnecting from the cylinder of pipelines. It is necessary to do it carefully not to damage pipelines.
2. From within salon to a rasshplintuyta a finger also disconnect a pusher fork from a brake pedal.
3. Turn off four nuts of fastening of the amplifier to a body.
4. From a motor compartment remove the amplifier.
5. Establish the amplifier upside-down.

       RECOMMENDATION
The vacuum amplifier – or replace one of the car knots, most responsible and difficult on a design, therefore repair it only in a specialized workshop assembled.