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79509 ABS-EBL working diagram for 4x2 vehicles (trucks and tractors) 1. Compressor - 2. Air processing unit - 10.5 bars - 3. Front axle air tank - 20 l. - 4. Parking air tank - 20 l. - 5. Rear axle air tank - 30 l. - 6. Manual discharge valve - 7. Air test point - 8. Parking manual control valve - 9. Handbrake low pressure switch turned on — 6.4 bars - 10. Parking control relay valve - 11. Trailer slowing manual control valve - 12. Trailer brake servo control valve - 13. Trailer system low pressure switch — 6.4 bars - 14. Trailer half couplings for tractors - 15. Trailer half couplings for trucks - 16. Parking system one-way valve - 17. Duplex control valve - 18. Rear axle combined cylinder - 19. Rear axle drum brake assembly - 20. Rear axle phonic wheel - 21. Rear axle speed sensor - 22. Rear axle ABS solenoid valves - 23. EBL pressure sensor - 24. Dual stop valve - 25. Rear axle brake control relay valve - 26. ASR control solenoid valve - 27. Controlled pressure valve with no return for ASR — 7.5 bars - 28. ABS electronic control unit - 29. Front axle brake control relay valve - 30. Front axle ABS solenoid valve - 31. Front axle diaphragm brake cylinder - 32. Front axle disc brake assembly - 33. Front axle phonic wheel - 34. Front axle speed sensor - 35. Front axle parking brake - 36. Brake light control microswitch - 37. Microswitch for EDC control unit - A. To the air suspension system - B. To the service system - * Optional extra. Figure 33 S TRALIS AT/AD 38 AIR SYSTEM - BRAKES Base - January 2003 |