Granta 4 new size
Previous materials:
on checking the chassis and transmission
check the steering
According to the maintenance regulations, we check the status of the brake system every 15 thousand kilometers.
We perform work on a viewing ditch or overpass.
To test the performance of the vacuum brake booster with the engine off, we press the brake pedal 5-6 times and, holding it pressed, start the engine. With a working vacuum booster, after starting the engine, the pedal should lean forward slightly. If this does not happen or the braking is not effective enough (you have to press the brake pedal with great effort), you need to check the tightness of the vacuum hose connections to the vacuum booster and the serviceability of the booster itself.
Check the condition of the brake pipes. The tubes must be firmly fixed in the holders and not have dents, mechanical damage, deep corrosion, as well as traces of leakage of brake fluid. If necessary, tighten the connecting fittings or replace the defective parts.
We inspect brake hoses, they should not have cracks, tears and scuffs.
We check the condition of each hose by creating fluid pressure in the brake system. To do this, the assistant must forcefully press the brake pedal and hold it during inspection. The appearance of bloating rubber or leaking brake fluid from the hose and its tips is not allowed. If damage is found, replace the hoses with the kit.
We check the condition and degree of wear of the pads and brake discs of the front wheels. To check, remove the front wheels alternately.
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Through the caliper window, we evaluate the thickness of the brake pads.
We replace the brake pads of both front wheels if the thickness of the friction lining of any of the pads has reached the maximum permissible value of 1.5 mm.
Turning the brake disc, inspect its working surfaces on both sides. There should be no cracks or deep grooves on the working surfaces of the disc.
Granta 41 2 new size
Using a caliper, measure the thickness of the disc, which should be at least 17.8 mm.
If, as a result of wear at the maximum diameter of the disk, a high bead forms, which prevents accurate measurement, we remove the bead using a file or other method, or measure the thickness of the disk with a micrometer. We replace a brake disk with defects in working surfaces or with extreme wear.
The degree of wear of the brake pads of the rear wheel brake is estimated by the state of the front shoe, which wears out faster than the rear.
Granta 41 3 new size
To do this, in the shield of the brake mechanism, a viewing window is made, closed with a rubber plug.
Granta 41 4 new size
We take out the cap …
Granta 41 5 new size
… And through the window we evaluate the condition of the front brake pad linings.
If the lining thickness is less than 1.5 mm, the brake pads of both wheels must be replaced.
To check the condition of the wheel cylinders and drums of the brake mechanisms of the rear wheels, remove the drums (see "Replacing the pads of the brake mechanisms of the rear wheels").
There should be no cracks or chips on the drums. In case of severe wear of the working surface, as well as in the presence of furrows, we replace the brake drum.
To check the condition of the sealing lips of the wheel cylinder alternately on each side …
Granta 42 1 new size
… we shift the edge of the cover from the protrusion of the cylinder body.
If there is brake fluid under the cover, indicating a malfunction of the sealing lips, the wheel cylinder must be replaced.
Granta 42 2 new size
We examine the pressure regulator in the brakes of the rear wheels and its drive.
The regulator and the drive must not be damaged, leakage of brake fluid from the regulator and brake pipes is not allowed. The piston of the regulator should not be stuck - when the brake pedal is pressed, the regulator rod must move.
Inspect the parking brake cables. The cables should not be damaged shells. Sheathed cables must move freely without jamming. Defective cables are replaced with new ones. You also need to replace the cables if they are stretched so that it is not possible to adjust the parking brake.
Check the performance of the parking brake. If necessary, adjust the parking brake.
The parking brake must hold the vehicle at a slope of 23%.
The full stroke of the parking brake drive lever must be between 2 and 4 teeth (clicks) of the ratchet lever device.
To adjust the parking brake, install the car on a viewing ditch or overpass and lower the parking brake lever.
Granta 42 3 new size
Using the “10” head, unscrew the four nuts securing the rear heat shield of the additional muffler.
Remove the rubber cushion from the front suspension bracket of the additional muffler.
We move the heat shield forward, giving access to the parking brake adjustment unit.
Granta 42 4 new size
While holding the “13” key with the adjusting nut of the cable end, with a head of the same size we unscrew the lock nut.
Turning the adjusting nut clockwise, we tighten the cables.
It is convenient to adjust the tension of the cables with a high head with a ratchet and extension cord. In this case, the locknut is not completely turned off, but, having combined its faces with the faces of the adjusting nut, we put on the high head “by 13” and rotate both nuts at once.