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9.16. Back working brake cylinder

Removal

Knot of a back brake
 1 – back working brake cylinder;
2 – top returnable spring

Unscrewing of a nut of fastening of a brake tube to a back part of the working brake cylinder

PERFORMANCE ORDER
1. In the presence take off a wheel cap, then weaken bolts of fastening of a back wheel. Lift a back part of the car and record on supports. Remove a back wheel.
2. Release the emergency brake.
3. Unscrew the screw of fastening of the brake drum and remove the brake drum. If the brake drum is kept by brake shoes, remove a cap from an opening in a brake board and, using the screw-driver, move a control lever of the emergency brake to a brake shoe in order that brake shoes departed from a drum. If necessary weaken a tension of a cable of the emergency brake.
4. Note an arrangement and, using flat-nose pliers, remove the top returnable spring squeezing brake shoes. Remove the top ends of brake shoes from pistons of the working brake cylinder (see rice. Knot of a back brake).
5. For reduction of losses of brake fluid uncover a popolnitelny tank of the brake system. Close a tank mouth polyethylene and again screw a cover. It is necessary in order that the cover hermetically closed a popolnitelny tank.
6. Remove dirt around the place of connection of a brake tube to a back part of the working brake cylinder. Unscrew a connecting nut. Being careful, take a brake tube from the working brake cylinder and close it a stopper (see rice. Unscrewing of a nut of fastening of a brake tube to a back part of the working brake cylinder).
7. Unscrew two bolts of fastening of the working brake cylinder to a brake board and, being careful, remove the working brake cylinder.

Repair

Details of the back working brake cylinder
 1 – dustproof cap;
2 – pumping union;
3 – case of the working brake cylinder;
4 – dustproof cover;
5 – piston;
6 – sealing ring of the piston;
7 – spring

Versions of the working brake cylinder

PERFORMANCE ORDER
1. Purify dust and dirt from the working brake cylinder.
2. Remove dustproof covers from each end of the brake cylinder.
3. Take both pistons from an uplotnitelna ми rings from the brake cylinder. Pistons are usually pushed out by spring pressure. Otherwise squeeze out pistons, giving compressed air under low pressure to an opening for supply of brake fluid.
4. Check a condition of pistons and the brake cylinder for wear, corrosion and other defects. With defects replace the working brake cylinder assembled. Keep in mind that the brake cylinder which was installed on earlier models can be replaced with the brake cylinder which is installed on later models.
5. Replace sealing rings irrespective of their state. On models since 1992 L-shaped sealing rings of the piston are established (see rice. Details of the back working brake cylinder, Options of the worker brake cylinder). Keep in mind that the repair kit of details of the brake cylinder of early type is not compatible to details of the modified brake cylinder.
6. Grease sealing rings of the piston with pure brake fluid and install them in cylinders, having inserted between them a spring.
7. Dip pistons into pure brake fluid and install them in the working brake cylinder.
8. Establish dustproof covers.

Installation

PERFORMANCE ORDER
1. Install the working brake cylinder on a brake board and fix by bolts.
2. Connect a brake tube to the working brake cylinder and fix by a connecting nut.
3. Install brake shoes on pistons of the brake cylinder and establish the top returnable spring.
4. Install the brake drum and fix it by the screw. If necessary, rotating a wheel of an adjusting level, take away brake shoes from a drum.
5. Remove polyethylene from a jellied mouth of a popolnitelny tank of the brake system and pump over the corresponding brake contour.
6. Adjust a gap between brake shoes and a drum for what several times press a brake pedal. When pressing a pedal during the normal work of an adjusting level the clicks published by an adjusting level have to be heard.
7. Establish a wheel and lower the car on the earth. Tighten bolts of fastening of a wheel the required moment.