VW Sharan repair. Diesel engines: 1,9 l of TDI.
+ 1. Introduction
+ 2. VR6 engine
+ 3. Two-liter engine (ADY)
+ 4. System of greasing of the engine
+ 5. Cooling system
+ 6. System of injection of fuel of the VR6 engine
+ 7. Simos system of injection of fuel of the 2,0-liter engine
+ 8. Ignition system
+ 9. Coupling
+ 10. Mechanical 5-step transmission
+ 11. Shaft of a drive of wheels
+ 12. Hydraulic booster of a steering
+ 13. Forward suspension bracket
+ 14. Back suspension bracket
- 15. Brake system
+ 15.1. Adjustment of brake system
+ 15.2. Disk brakes of forward wheels
+ 15.3. Brakes of back wheels
15.4. Processing of brake disks
+ 15.5. Main brake cylinder
15.6. Check of the vacuum amplifier of a brake drive
15.7. Pumping of brakes
+ 15.8. Parking brake
- 15.9. ABS system (anti-blocking brake system)
15.9.1. Removal and installation of the vacuum amplifier on the car equipped with ABS
+ 16. Electric equipment
+ 17. Diesel engine
+ 18. System of greasing of the diesel engine
+ 19. System of cooling of the diesel engine
+ 20. Power supply system of the diesel engine and turbokompressor
+ maintenance Card
+ Specifications and characteristics
Repair Sharan/Sharan Volkswagen>> Brake system>> ABS system (anti-blocking brake system)
On Sharan cars the anti-blocking system of production of the ITT Teves company is established as the serial equipment.
The ABS system increases active safety of the car and interferes with blocking of wheels at sharp braking. Thus the car to a full stop keeps controllability, without drift.
The structure of ABS includes standard system of braking, sensors of frequency of rotation of wheels, the hydraulic block, the electronic control unit (EBU-ABS) and a plait of electric wires.
Sensors of frequency of rotation of wheels of ABS system hand over information in the form of an electric current of an alternating voltage about frequency of rotation of wheels on EBU-ABS. Sensors of frequency of rotation of forward wheels are placed on rotary fists, and back wheels — on pins.
EBU-ABS on signals from all four sensors of frequency of rotation of wheels measures acceleration, delay or sliding of each wheel. Comparing speed of rotation of each wheel to average speed of all wheels, EBU-ABS defines degree of a proskalzyvaniye of separate wheels and by that can establish the moment when one of them approaches close to blocking, and on the basis of this information gives out operating impulses on electromagnetic the valve of the hydraulic block. As soon as one of wheels approaches to blocking, pressure of brake liquid in its support becomes too high in relation to coupling of the tire with the road. The hydraulic system under the influence of signals of management supports pressure of brake liquid the stable. It means that pressure in a support does not raise even by further pressing a brake pedal. If danger of blocking remains, thanks to opening of the final valve pressure decreases, but only to such level when the wheel again starts to be accelerated a little then pressure is again supported to constants.
If the wheel starts to rotate quicker, EBU-ABS gives out a signal on pressure increase, but not above the general pressure in brake system. The driver feels ABS action on a pulsation of a brake pedal and a characteristic sound of operation of the hydroblock in a motor compartment that signals it about movement in boundary conditions.
The hydroblock is established on the brake highway after the main brake cylinder. On each of four pipelines suitable to the hydroblock the electromagnetic valve which takes away brake liquid to the electropump providing brake pressure in the highway of a concrete wheel is established.
At malfunction of AVS EBU-ABS system stops development of operating impulses, and in a combination of devices the control lamp of ABS constantly burns. Failure of ABS system allows to move to the car, but demands bigger attention to speed of movement and a road situation as management efficiency sharply decreases.