1990 — 2001 of release
Repair and car operation
+ Identification numbers of the car
+ Governing bodies
+ Settings and routine maintenance
+ cooling and heating Systems
+ Power supply system and release
+ engine Electric equipment
+ Control systems of the engine
+ Manual transmission
+ Coupling and transmission line
- Brake system
Replacement of the sensor switch of stoplights
Removal and GTTs installation
Adjustment of a pedal of a foot brake
Check of serviceability of functioning/tightness, removal and installation of the vacuum amplifier of brakes
Removal and valve regulator installation
Removal and installation of brake lines
Pumping of brake system
Disk brake mechanisms - the general information
Assessment of a condition of brake shoes
Replacement of blocks of disk brake mechanisms
Removal and installation of supports of disk brake mechanisms
Regenerative repair of a support of the disk brake mechanism
Removal, check of a condition and installation of a brake disk
Drum-type brake mechanisms - the general information
Removal, installation and check of a condition of a brake drum
Check of a condition of brake boots
Removal and installation of brake boots
Adjustment of drum-type brake mechanisms
Removal, regenerative repair and installation of wheel cylinders
Removal and cable installation (ов) drive of the parking brake
Adjustment of the parking brake
Removal and installation of frictional boots of the parking brake (model with disk brake mechanisms of back wheels)
System of anti-blocking of brakes (ABS) - the general information, problem diagnostics and codes of malfunctions
Removal and installation of the hydraulic modulator
Removal and ABS control unit installation
Removal and installation of wheel sensors
Removal and installation of sensors of accelerations (G-sensors)
Replacement of rotors of wheel sensors
+ Suspension bracket and steering
+ Onboard electric equipment
General informationAll models of cars considered in the real Management are equipped with hydraulic brake system with vacuum strengthening. On forward wheels disk brake mechanisms, on back - both disk, and drum-type are always established.
All brake mechanisms are equipped with self-regulators. Thus compensation of wear of brake shoes of disk mechanisms is carried out automatically whereas, on drum-type mechanisms the special adjusting devices which activation occurs when raising the parking brake are established.
The main brake cylinder (GTTs) is established on assembly of the servo-driver of the vacuum amplifier of the brakes, fixed on a back partition of an impellent compartment. From above on the cylinder the big tank of hydraulic liquid equipped with a plastic cover is located.
GTTs has the dual design providing functioning of two independent hydraulic contours (forward and back). Pressure of liquid in each of contours is forced by the individual piston in separate chambers of the main cylinder. As the GTTs primary piston directly (through a metal rod) is connected to a pedal of a foot brake, moving of the last inevitably conducts to increase of hydraulic pressure in brake lines. Instant increase of pressure in lines leads to moving of pistons in supports / wheel cylinders of brake mechanisms, and the size of effort developed by the last increases in proportion to an increment of the area of their pistons concerning the area of GTTs pistons.
Wheel cylinders of drum-type brake mechanisms are equipped with two pistons which are pushed out in opposite directions and brake boots providing a clip to a working surface of a drum. In disk mechanisms cylinders are built in assemblies of supports and provide possibility of a szhimaniye of a brake disk between two frictional blocks.
Brake blocks/boots, and also GTTs pistons are equipped with returnable springs that guarantees transition of system to an initial condition at an otpuskaniye of a pedal of a foot brake.
Tightness of landing of pistons in cylinders is provided at the expense of use of rubber sealing cuffs, for protection of cylinders against dirt and moisture special boots are provided.
Main brake cylinder
In the main brake cylinders of double-circuit brake systems two pistons established directly one after another are used. The primary piston is directly connected by means of a metal rod to a brake pedal. The drive of the secondary piston is carried out in a hydraulic way at the expense of the prisoner between pistons of volume of liquid. At formation of leaks ahead of the secondary piston, the last is displaced forward against the stop in a face wall of the cylinder and the liquid which was between pistons gets only to a back brake contour of system. At emergence of leaks in a back contour, the primary piston rests directly against an end face secondary, providing isolation of a defective site of a path.
In all dual brake systems possibility of the prevention of the driver about refusal of one of hydraulic contours is realized. The sensor switch is usually built in the case of the valve established on a back partition of an impellent compartment, or on a frame under GTTs assembly. In the valve there is a piston which has been at the same time connected to both contours of a hydraulic path in such a manner that pressure developed in them is put to the relevant party of the piston. At serviceable contours of pressure in both contours are equal and the piston remains motionless. Any violation of balance leads to shift of the piston and sensor switch short circuit in which chain the special control lamp is included established on an instrument guard of the car. Besides the sensor switch the structure of klapanny assembly can include also dosing out valve providing a delay of giving of pressure in a forward contour till the beginning of operation of drum-type brake mechanisms of back wheels that allows to avoid car braking by only one forward wheels.
The special valve regulator allows to supervise pressure in wheel cylinders of back brake mechanisms, preventing thereby premature blocking of back wheels at sharp braking.
Check of serviceability of functioning of a control lamp can be carried out by a way of squeezing of a pedal of a foot brake at the open gate of pumping of one of brake mechanisms. In case of need replace a lamp, or check serviceability of the corresponding electroconducting and execute necessary regenerative repair.
Entering into a standard complete set of all models the special vacuum amplifier uses depression created in the inlet pipeline for increase of efficiency of functioning of a hydraulic actuator of brake system. The servo-driver of the vacuum amplifier is fixed on a back partition of an impellent compartment in the last.
System of anti-blocking of brakes (ABS)
ABS prevents premature blocking of wheels of the car at sharp braking (see. Section Replacement of the sensor switch of stoplights).
The hummock drive of the parking brake is brought to brake mechanisms of back wheels of the car. Driving cables are brought to executive levers of assemblies of brake boots.
On termination of any of procedures of the service, connected with removal or dismantling any of components of brake system without fail check efficiency of functioning of brake system and having only made sure of full serviceability of its operation, start car operation. Trial runs should be made on a pure dry and equal paving.
Check efficiency of braking of a vehicle on various speeds of movement and various efforts of squeezing of a pedal of a foot brake. The car should be braked evenly, keeping thus course stability. Try not to allow premature blocking of the wheels, fraught loss of control over management.
Remember that to number of the factors affecting efficiency of braking of a vehicle, the condition and pressure of a rating of tires, level of loading of the car and correctness of geometry of a suspension bracket belong.
At service of components of brake system of cars it is necessary to observe some special precautionary measures:
a) For filling of brake system use only hydraulic liquid of the class DOT 3;
b) Frictional overlays of brake blocks/boots can contain unhealthy asbestos. Try not to inhale a brake dust, do not blow off it the compressed air. To rubbing of components of brake mechanisms apply only special cleaning structures;
c) Watch observance of all demanded admissions and efforts of a tightening of fixture. At service of components use only the serviceable tool. At the slightest doubts address for the help to experts. Remember that serviceability of functioning of brakes is guarantee of traffic safety;
d) At the slightest signs of violation of serviceability of functioning of brake system operation of the car should be suspended!