Daewoo Nexia

since 1994 of release

Repair and car operation

Deu Neksiya
+ Maintenance instruction
+ Maintenance
+ Engine
+ 3. Engine (two top camshafts)
+ cooling System
+ Toplevnaya and exhaust systems
+ Electric chain
+ 7. Ignition system
+ 8. Electronic control unit and sensors
+ Transmission
+ 10. Five-speed transmission and main RPO MM5 broadcast
+ 11. Automatic Transmission
+ Steering
+ Running gear
+ 14. Forward suspension bracket
+ 15. Drive of forward wheels
+ 16. Back suspension bracket
- Brake system
   17.2. General description
   17.3. Check of a technical condition of brake system
   17.4. Filling of a tank of the main brake cylinder
   17.5. Air removal from brake system
   17.6. Washing of brake system
   17.7. Check of a regulator of brake forces
   17.8. Brake hoses (forward)
   17.9. Brake hoses (back)
   + 17.10. Parking brake
   17.11. Check of a condition of forward brake slips
   17.12. Check of a condition of back brake slips
   17.13. Brake disks
   17.14. Brake drums
   17.15. Brake pedal
   17.16. Main brake cylinder
   17.17. Tank
   17.18. Regulators of brake forces (proportional valves)
   17.19. Main brake cylinder assembled
   17.20. Repair of the main brake cylinder
   17.21. Disk brake mechanism
   17.22. Blocks and slips
   17.23. Protective cover of the piston
   17.24. Brake disk
   17.25. Support
   17.26. Guard
   17.27. Support repair
   17.28. Drum-type brake mechanism
   17.29. Adjustment of the brake mechanism
   17.30. Adjustment of the parking brake
   17.31. Basic brake disk
   17.32. Wheel cylinder
   17.33. Repair of the wheel cylinder
   17.34. Vacuum amplifier of brakes
   - 17.35. Anti-blocking system of brakes
      17.35.1. Functioning of signaling devices
   17.36. Air removal from a brake hydraulic drive
   17.37. Air removal from a brake hydraulic drive manually
   17.38. The valve for air removal from the block of modulators
   17.39. Electromagnetic valves of modulators
   17.40. The block of hydraulic modulators with electric motors
   17.41. Electronic control unit braking
   17.42. Sensor of angular speed of a forward wheel
   17.43. Flexible conducting of DUS of a forward wheel
   17.44. Sensor of angular speed of a back wheel
   + 17.45. Flexible conducting of DUS of a back wheel
   17.46. System electric safety lock
   17.47. ABS relay
   17.48. Signaling devices
+ Body
+ Heating, ventilation
+ Electric equipment


17.35.1. Functioning of signaling devices


1. At ignition inclusion (before engine start) the signaling device of "ABS" which dies away in 3 seconds lights up. At the same time with it joins and quickly "BRAKE" signaling device dies away.

2. At starter inclusion both signaling devices: red "BRAKE" and yellow "ABS" should burn constantly.

3. After engine start-up the signaling device of "BRAKE" should be switched off immediately, and "ABS" signaling device – 3-4 seconds later.

The size of the tires established on the car, is very important from the point of view of operability of ABS. At replacement of tires it is necessary to use only tires similar in the sizes, loading capacity, a design and according to other operational characteristics to original tires by which the new car was completed. It is necessary to pay attention to standard marking of tires. To replace tires follows only the whole sets on an axis. Ustanov on the car of other tires can seriously affect operability of ABS.

ABS consists of standard brake system and additional knots. The brake system includes the vacuum amplifier, the main brake cylinder, forward disk brake mechanisms, back drum-type brakes with active and passive blocks, brake pipelines and hoses, the sensor of falling of level of brake liquid and "BRAKE" signaling device. Into number of the ABS additional hubs enter: hydraulic modulators with an electromechanical drive, TEBU, the relay of a food of the actuation mechanisms, two safety locks, four sensors of angular speed of wheels (on each wheel), electric conducting, a control unit a signaling device and "ABS" signaling device.

The modulator and electromechanical drive include the case, the piston, sharikovintovy transfer, the return valve, EMK (only for forward wheels), the electric motor, a brake spring and shesterenny transfer. The modulator is intended for regulation of pressure of brake liquid in the wheel cylinder.

Management of process of braking of separate wheels carries out microprocessor TEBU. On an entrance of TEBU signals from sensors of angular speed of wheels, the switch of a stoplight and the ignition lock arrive. A food of the ABS executive hubs is carried out from TEBU and the battery via the relay which inclusion TEBU operates. Three electric motors of the modulators, two EMK of the relay of inclusion of a food of the ABS actuation mechanisms and the diagnostic socket are connected to an exit of TEBU. The consecutive line of data of TEBU is connected to the plug M of the diagnostic socket and provides transfer of diagnostic information at check of serviceability of system. TEBU supervises angular speeds of all four wheels. If at the pressed brake pedal (the stoplight is included) blocking of one of wheels begins, TEBU gives team to the corresponding modulator on pressure decrease of brake liquid in the working cylinder of this wheel. EMK and the electric motor of a drive of the modulator thus joins. After reduction of a proskalzyvaniye of a wheel of TEBU gives command for increase in pressure in the wheel cylinder and watches change of angular speed of a wheel. At increase in a proskalzyvaniye of TEBU again gives command for wheel unblocking. The described cycles регулирова a niya of pressure of brake liquid repeat to a stop of the car or an otpuskaniye of a brake pedal or until danger of blocking of braking wheels remains. Except direct functions of management of TEBU carries out self-diagnostics and diagnostics of all sensors and the actuation mechanisms connected to its entrance and an exit. At обнаруже the scientific research institute of any refusal in ABS TEBU establishes the corresponding code неисправ to Nosta and brings it in non-volatile memory (ROM) in which information remains even at food shutdown.


TEBU is not subject to dismantling and repair in operation. At refusal the block is replaced entirely.

The inductive sensor of angular speed of a forward wheel is established on a fist of a rack of a forward suspension bracket. The magnetic core of the sensor is located with a small gap from a wreath of a gear ring which rotates together with a forward wheel of the car. At ring rotation in a winding of the sensor the EDS variable is directed. The amplitude and frequency of a signal of the sensor depend on speed of movement of the car, increasing together with it. And, frequency of a signal of the sensor is proportional to speed of the car. The sensor of angular speed is executed by not folding. The gap between the core of the sensor and a gear ring is not subject to adjustment in use.

Gear ring with 47 evenly located teeths napressovano on the case of the external hinge of equal angular speeds of a drive of a forward wheel. At carrying out servicing or repair of a forward suspension bracket and a drive of driving wheels it is necessary to show care not to damage or to break ring teeths. If teeths of a ring appeared damaged, it is necessary to replace the external hinge of a drive of a forward wheel.

The sensor of angular speed of a back wheel works to similarly forward sensor. The sensor and a gear ring are built in knot of a nave of a back wheel. At damage of the sensor or a gear ring it is necessary to replace a nave assembled.

Normally opened relay is calculated on the considerable current necessary for a food of the ABS actuation mechanisms. The relay at the command of TEBU connects the storage battery to an entrance of the block which operates a food of electric motors and EMK of modulators. The relay is located on the right side of motor office about the block of hydraulic modulators, established го on a mudguard.

In the course of work of TEBU carries constantly out self-diagnostics and diagnostics of ABS peripherals. At refusal detection in ABS the yellow signaling device of "ABS" starts to blink or burns constantly, reporting to the driver about refusal. The signaling device blinks, if the arisen malfunction does not put at once ABS out of action. Nevertheless, at a blinking signal of "ABS" it is necessary to check as soon as possible system and to eliminate malfunctions. At emergence of serious refusal which to a prepyatstvo ет to normal work of ABS, the signaling device of "ABS" burns constantly. Car braking in a mode from working ABS is impossible. However the Brake system of the car can work in the main mode of braking (without ABS inclusion). In this case it is necessary to find out a cause of defect and to repair ABS.

The signaling device of "BRAKE" of red color joins in the following cases: when falling level of brake liquid norms, turning on of the parking brake are lower, at the included ignition and the idle engine or at the command of TEBU TEBU includes the signaling device "ВRAKE" at emergence in ABS of such refusals which can affect operability of brake system. In this case TEBU brings in memory a code of the corresponding malfunction, the A086 code about signaling device inclusion "BRAKE' and switches off ABS.

The electronic device switches off "ABS" signaling device at the command of TEBU. Before receiving command from TEBU the signaling device of "ABS" remains included.


Brake liquid can cause irritation of eyes and skin. At hit of brake liquid on open sites of a body it is necessary to execute the following. At liquid hit in eyes – carefully to wash out water. At liquid hit on skin – to wash out water with soap. At hit to the food highway – immediately to address for medicine the sky help.

It is necessary to avoid hit of drops of brake liquid on the painted surfaces of the Body of the car, isolation of electric wires and sockets of conducting and electric equipment devices Brake liquid has ability to damage a paint and varnish covering and electric equipment conducting. At hit of brake liquid on the specified details it is necessary to wash out this place water.