HYDRAULICS 1.90 DUAL BRAKE VALVE (SAFIM)-Servicing NOTE : From Machines S/No.51200472 only. Servicing is normally restricted to the replacement of seals in the brake master and brake valve modules of the valve assembly. When any cylinder bore or sliding contact surface is scored, the brake valve must be replaced. The dismantling and installation (General) are similar to that detailed for the single servo valve (refer Page 1.82). 3. Before assembly, lightly lubricate the parts from the repair kit and the spool and sleeve with clean hydraulic oil. 4. Make sure all parts are clean before assembly. Dismantling (Brake Master Module) 1.
Remove the grub screw (2) that secures the pedal pivot pin (5) in position. Carefully drift out the pedal pivot pin (5) from the pedal base and extract the pedal lever (1) and cover (3). 2. Remove the end plug (4) from the brake master module (19). 3. Extract the valve cylinder (17) from the brake master module (19). 4. Remove the circlip (15) from the brake master module (19). 5. Carefully extract the O-seal (13), valve assembly and gland seal (18) from the brake master module (19). 1. Pedal lever 2. Grub screw 3. Cover 4. End plug 5. Pivot pin 6. Plug 7. Washer 8. Adjuster 9. Nut 10. Screw 11. Springs 12. Pin 13. O-ring seal 14. End plate 15. Circlip 16. End plate 17. Valve cylinder 18.
Gland seal 19. Brake master module 6. Remove the plug (7) and washer (6) from the brake master module (19). 7. Remove the adjuster (8) and nut (9) from the brake master module (19). 8. Remove the screw (10) and pin (12) from the valve assembly. Separate the two end plates (14) and (16) and three springs (11) of the valve assembly. 9. Clean and examine the valve assembly parts and bore, pedal pivot pin (5) and pivot points of the brake master module (19). Assembly (Brake master module) 1. Installation is the reverse of the removal. 2. Make sure a new gland seal (18) and O-ring seal (13) are fitted.