14.3.1. Check and replacement brake колодок

Fig. 298. The control of a thickness of overlays through an aperture on an underside of a brake board

On an underside of brake boards stoppers after which removal it is possible to check up a thickness of brake overlays are established. On fig. 298 it is shown, where there is a viewing aperture. Will light a pocket small lamp in it. If the thickness of an overlay has decreased as a result of deterioration approximately to 2,5 mm колодки it is necessary to change in the complete set, on both wheels.

For replacement колодок it is necessary to execute the operation following:

- To raise a back part of the car and to establish it on support;

- To substitute an emphasis under back wheels;

- To return in a starting position the adjustment mechanism, otherwise brake колодки can get stuck in a drum. With that end in view it is necessary to insert behind into a drum through one of carving apertures a screw-driver, to grope regulating wedge of the mechanism and to push out it upwards. The mechanism is at the left on the top party of a drum (fig. 299);

Fig. 299. The Reset of a wedge of the mechanism of adjustment through an aperture on an inside of a brake drum

- To uncover naves, cautiously hooking a screw-driver or using for this purpose the special tool shown on fig. 285;

Fig. 285. Removal of a cover of a nave. At use of the similar tool to watch that the cover has not been damaged

- To remove a brake drum. At its jamming once again to wring out upwards regulating wedge, as is shown in fig. 299;

Fig. 301. Removal brake колодок. Keeping pins and a hook of fastening of the bottom returnable spring are shown by arrows

- To press a finger from an underside the pins keeping brake колодки, to grasp flat-nose pliers a spring plate on lateral aspect колодки (the top arrow on fig. 301) to wring out it inside and to develop until a pin head does not begin to spend probably through a spring. To remove a spring plate, a spring and a pin. To spend this work on both колодках;

- To undertake one колодку a hand on the bottom party and to take out it from a support. To unhook a hook of the liberated bottom returnable spring;

- To develop both brake колодки downwards, as is shown in fig. 302, and to disconnect a cable of a lay brake from колодки;

Fig. 302. Removal brake колодок. The place of connection of a cable of a lay brake is shown by an arrow

Fig. 303. Dismantling brake колодок in a vice: and — a detachment of springs колодок (the locations of hooks are shown by arrows); — by an arrow the spring разжимной laths is shown

- To clamp brake колодки in a vice, as is shown in fig. 303, and to unhook by means of flat-nose pliers a clamping spring of a regulating wedge and the top returnable spring. To remove one колодку, having disconnected on the one hand разжимную a lath;

- To raise разжимную a lath before position when its spring will be liberated also it it will be possible to unhook and completely to remove. Also to take out regulating wedge, having remembered, as it has been established;

- Carefully to clear all details. Especially to check up a condition of rubber covers of brake cylinders. At detection of leaks of a liquid it is necessary to repair or replace cylinders;

Fig. 304. Installation brake колодок in a vice

- To clamp колодки, as is shown in fig. 304, in a vice, to establish a tension spring and to insert разжимную a lath in колодку. Both operations to spend simultaneously. For this purpose it is necessary to stretch a spring while it will not be fixed;

Fig. 305. Assemblage колодок before installation

- To insert regulating wedge in колодки and to collect колодки, as is shown in fig. 305. To fix the top returnable spring. For exact fastening of springs to be guided by fig. 300;

Fig. 300. Details of a back brake: 1 — brake колодка; 2 — a tension spring of a wedge; 3 — the bottom returnable spring; 4 — the top returnable spring; 5 — the lever of a lay brake; 6 — a press spring; 7 — a cup of a press spring; 8 — a clamping spring; 9 — разжимная a lath; 10 — a regulating wedge; 11 — the working brake cylinder; 12 — a bolt of fastening of the brake cylinder; 13 — a brake board; 14 — a keeping pin; 15 — a stopper of a viewing aperture

- To fix a cable of a lay brake, to dissolve both brake колодки from above and to establish the top ends колодок in pistons of the brake cylinder of a wheel, without having damaged thus rubber covers;

- To fix the bottom returnable spring and to establish left колодку on a support;

- To fix a clamping spring of a regulating wedge and to raise колодку a screw-driver over a support;

- To establish keeping pins колодок in sequence, return dismantling;

- To establish a brake drum and to adjust the bearing of a nave of a back wheel (подразд. 13.2);

- Some times to press a brake pedal, to put in action the adjusting mechanism in a back brake.