since 1995 of release
Repair and car operation
KIA of Sefia / Noise/range
+ 2. Engine
+ 3. Greasing system
+ 4. Cooling system
+ 5. Power supply system and release
+ 6. Fuel system
+ 7. Ignition system
+ 8. Coupling
+ 9. Mechanical transmission
+ 10. Automatic transmission
+ 11. Axes and power shafts
+ 12. Steering
+ 13. Wheels and tires
- 14. Brake system
14.2. Pumping of hydraulic system of a drive of brakes
14.3. Check of brake tubes and hoses
14.4. Replacement of brake hoses
14.5. Height of installation of a pedal of a brake
14.6. Free wheeling of a pedal of a brake
14.7. Distance of a pedal of a brake from a floor
14.8. Check of the vacuum amplifier of brakes
14.9. Parking brake
14.10. Brake pedal
14.11. Main brake cylinder
14.12. Vacuum amplifier of brakes
14.13. Replacement of forward brake shoes
14.14. Replacement of brake shoes on back drum-type brakes
14.15. Replacement of brake shoes on back disk brakes
14.16. Parking brake
14.17. Block of hydraulic management (HCU)
14.18. Forward sensor of frequency of rotation of a wheel
14.19. Back sensor of frequency of rotation of a wheel
14.20. Gear rotor of the sensor of frequency of rotation of a wheel
14.21. Repair of the working brake cylinder
14.22. Main survey
14.23. Check of functionality
14.24. List of codes of malfunctions of brake system
+ 15. Suspension bracket
+ 16. Body
+ 17. Central air
+ 18. Electric equipment
On cars the working brake system with a hydraulic drive is used.
Main ABS functions:
– reduction of a brake way at the expense of an exception of blocking of wheels at intensive braking;
– improvements of stability of driving in the course of braking.
The anti-blocking system of brakes works at information basis from four sensors transferred to the ABS block. The system operates each wheel separately and reduces pressure of liquid in that wheel brake mechanism which wheel starts to be blocked.
Arrangement of elements of anti-blocking system of brakes (ABS) on the car
Under normal conditions, the standard brake system carries out braking till blocking of the wheel found by the ABS control unit. During usual braking inlet valves usually open, and final valves are usually closed.
When the ABS control unit finds wheel blocking, it operates each valve for increase or pressure reduction.
The ABS control unit defines frequency of rotation and norm of delay of each wheel on the basis of information from sensors of frequency of rotation of a wheel. When braking frequency of rotation of a wheel decreases, and the ABS block defines a difference between speed of the car and frequency of rotation of a wheel. If delay of some wheels exceeds expected value, the ABS block defines the beginning of blocking and opens the corresponding electromagnetic valves to reduce pressure of brake liquid.
ABS control unit
The ABS control unit carries out the following functions:
– ABS operates;
– calculates speed of the car;
– carries out system self-diagnostics: codes of malfunctions with self-diagnostic and safety functions are brought in memory by two separated microprocessors.
The ABS control unit continuously checks blocking of each wheel and operates each valve to regulate pressure of brake liquid if it is required. The ABS control unit also checks that components work properly, and switches off ABS, at detection of failures. Then the brake system works as standard brake system.
Sensor of frequency of rotation
Control lamp of ABS
The control lamp of ABS located in a combination of devices lights up for 2 seconds after ignition inclusion.
Block of hydraulic management (HCU)
The block of hydraulic management (HCU) consists of the pump with an electric motor and the block of valves to operate pressure of ABS.
The sensor is located in the electric motor of the pump and transmits a target signal to the ABS block which defines operability of the pump.
The pump with two contours provides demanded pressure, and the block of valves distributes the pressure transferred to wheel brake mechanisms.
The ABS control unit starts to carry out self-diagnostic functions after ignition inclusion. The ABS control unit finds malfunction for each contour, and a component, comparing a system condition to a limited set of conditions in the ABS control unit. The ABS control unit stores a code of malfunction and then deduces on the diagnostic device in the form of the codes designated by four figures.
Check of codes of self-diagnostics
Precautions before carrying out repair
1. For prevention of damage of elements of brake system before carrying out repair or diagnostics satisfy the following conditions:
– switch off ignition and disconnect each component of brake system;
– components which are not maintainable, replace as knot;
– when using electric welding disconnect each component of brake system.
2. Brake liquid dissolves paint, plastic and isolation of wires therefore at casual hit of liquid on a paint and varnish covering of the car or its components, wash out them a large amount of water.