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Triumph TR6 Brake Hydraulics & Controls |
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Page Contents
Servo Repair Kits
©Rimmer Bros Ltd - Registered in England No. 2155394. VAT No. GB 352 8473 40.
Brake Master Cylinder & Servo
Brake & Clutch Pedals
Clutch Master Cylinder
Consumables
1. 
Master Cylinder Assembly - (1) - GMC234
Includes cap and reservoir.
2. Fluid Reservoir Assembly - (1) - 517333
Replacement kit.
3. Cap (filler) - (1) - 214912
4. Seal (filler cap) - (1) - 517041
5. Screw (reservoir to cylinder) - (4) - 517044
6. Washer (locking) - (4) - 517045
7. Repair Kit (brake master cylinder) - (1) - 517332
Includes seals for filler cap and reservoir.
8. Tipping Valve Assembly - (1) - 517033
9. Spring - (1) - 517028
10. Spring - (1) - 517031
All servo repair kits include the following; seal & plate assembly, dust cover, dust cover retainer and filters. The major repair kit also includes the bayonet type non-return valve and O Ring seal. None of the repair kits include the main diaphragm seal.
Construction and design of the servo fitted to the TR6 has changed since production commenced. There are two areas that will need to be observed if the correct repair kits are obtained and used. These items are the servo air inlet non-return valve attachment and the push rod seal between the servo and the brake master cylinder. The servo air non-return valve can be either a bayonet fitting sealed with an 'O' ring or a push-in type valve with a serrated sided seal area that fits into a grommet in the servo. The other change that is not so easy to see is the seal between the brake master cylinder and the push rod that it acts on in the servo. The easy identification for this is whether the seal is supported in a metal disc or it is a cup shape with grooves in it. The latter is also identifiable by a series of parallel knurls on the shank of the push rod.
The servo serviced by 12446 is quite rare and to make matters worse it was not allocated to any particular chassis numbers. The difference between the two types of servo is internal so the servo must be dismantled to ascertain which one of the two is fitted. If the master cylinder is removed from the servo, the outside face of the seal and plate assembly will be visible through the aperture to facilitate easy identification. The actual difference is that the master cylinder end of the valve push rod and the servo requiring kit 12446 has a 3/8" diameter and parallel knurled rod. Those requiring 18G8951A are diamond knurled and are 5/16" diameter. The correct seal for the 3/8" pushrod has 6 radially moulded ribs to identify it. (See illustrations A and B).
11. Servo Unit Assembly - (1) - 218072
12. Major Repair Kit (servo) - (1) - 517330
Includes non-return valve. Servo push rod to master cylinder seal is type supported in a metal disc.
13. Repair Kit (servo) - (1) - 18G8951A
Servo push rod to master cylinder seal is type supported in a metal disc.
14. Filter (air) - (1) - 516899
It is recommended that the servo air filter (516899), which is a foam seal around the pedal push rod be changed every 40,000 miles or 3 years. The filter is part of both types of servo repair kit.
15. Non-Return Valve (bayonet type) - (1) - 516907
16. 'O' Ring (non-return valve to servo) - (1) - 516906
17. Repair Kit (servo) - (1) - 12446
Servo push rod to master cylinder seal is cup type with grooved surface.
18. Non-Return Valve (push-in type) - (1) - 18G8953
Servo push rod to master cylinder seal is cup type with grooved surface.
19. Diaphragm (servo) - (1) - 516901
20. Nut (plain, imperial threaded, master cylinder to servo) - (2) - HN2008
Early supply servo units.
Nut (plain, metric threaded, master cylinder to servo) - (2) - GHF214
Later supply servo units.
21. Washer (locking) - (2) - WQ308
Early supply servo units.
Washer (locking) - (2) - GHF383
Later supply servo units.
22. Nut (plain, imperial threaded, servo to pedal box) - (4) - HN2008
Early supply servo units.
Nut (plain, metric threaded, servo to pedal box) - (4) - GHF213
Later supply servo units.
23. Washer (locking) - (4) - WL208
Early supply servo units.
Washer (locking) - (4) - GHF382
Later supply servo units.
24. Washer (plain) - (4) - WP125
Early supply servo units.
Washer (plain) - (4) - WP125
Later supply servo units.
The servo unit may be fitted with metric threaded studs to attach the brake master cylinder. When installing a new servo ensure new nuts of the correct type are obtained with the servo to save difficulty when installing because of not having the correct fasteners.
25. Spacer (aluminium, servo to bulkhead) - (1) - 148024
26. Pin (clevis, pedal to push rod) - (1) - PJ8808
27. Washer (plain) - (1) - WP8
28. Split Pin - (1) - PC9
29. Switch (brake light) - (1) - 134529
30. Washer (shakeproof) - (1) - WN711
31. Nut (half, locking brake light switch) - (1) - JN2111
32. Hose (servo to manifold, 25" long, RH steering) - (1) - 149329
Hose (servo to manifold, 30" long, LH steering) - (1) - 149330
33. Clip ('Corbin', servo hose clamping) - (2) - CC5011
34. Valve and Adaptor (non-return, screwed into inlet manifold) - (1) - 144373
35. Washer (fibre) - (1) - WF513
36. Clip (servo hose to rocker cover) - (1) - 514048
LH steering.
37. Pedal Box Assembly (RHD) - (1) - RR1377
Includes pedals.
Pedal Box Assembly (LHD) - (1) - RR1378
Includes pedals.
38. Pedal Set (RHD) - (1) - RR1337
Includes accelerator, brake & clutch pedals.
39. Pedal Box (housing only) - (1) - 308273
40. Brake Pedal Assembly (RHD) - (1) - 148020
Brake Pedal Assembly (LHD) - (1) - 148022
41. Clutch Pedal Assembly (RHD) - (1) - 148021
Clutch Pedal Assembly (LHD) - (1) - 148023
42. Pedal Rubber (brake & clutch) - (2) - 122289
43. Bush (pedal to pedal shaft) - (4) - 136611
2 per pedal.
Initial production of cars had plastic pedal bushes (147166), these were found to be insufficiently hard wearing so the installation was modified by the fitment of steel backed bushes. Triumph spares departments subsequently supplied the steel backed bush (136611) for all replacements. Cars built after commission no. CP50000 were also so fitted. Many cars are still fitted with the plastic pedal bushes (or what is left of them). A clutch or brake pedal that is able to be wobbled from side to side will indicate worn pedal bushes.
44. Shaft (pedal pivot) - (1) - 148017
45. Washer (double coil) - (2) - 44630
Washer (double coil) - (2) - 1A2139
Alternative.
46. Circlip (securing ends of pedal shaft) - (2) - 506542
47. Spring (pedal return) - (2) - 57950
48. Screw (upper, pedal box to bulkhead) - (9) - HU705
49. Washer (locking) - (9) - WL207
50. Washer (plain) - (9) - WM57
51. Screw (front, pedal box to bulkhead)* - (2) - HU805
52. Washer (locking)* - (2) - WL208
53. Washer (plain)* - (2) - WP8
* RH steering models only; blanking holes for LH steering cylinder.
For more details of the clutch and its hydraulic system see Clutch & Hydraulics
54. Clutch Master Cylinder Assembly - (1) - 148531
0.75" bore, RH steering*.
Clutch Master Cylinder Assembly - (1) - 145932
0.7" bore, RH steering**.
55. Clutch Master Cylinder Assembly - (1) - 148530
0.75" bore, LH steering*.
Clutch Master Cylinder Assembly - (1) - 154933
0.7" bore, LH steering**.
56. Repair Kit (0.75" bore)* - (1) - GRK1027
Repair Kit (0.7" bore)** - (1) - 18G8986
* To body no. 50910CP/52951CC
** From body no. 50911CP/52952CC
57. Seal (filler cap) - (1) - 106095
58. Filler Cap - (1) - 106094
59. Pin (clevis, cylinder push rod to pedal) - (1) - PJ8808
60. Washer (plain) - (1) - WP8
61. Split Pin - (1) - PC9
62. Bracket (mounting clutch master cylinder)* - (1) - 146413
63. Dust Cover (pedal to cylinder push rod)* - (1) - 125217
64. Screw (cylinder attachment)* - (2) - HU807
65. Washer (locking)* - (2) - WL208
* RH steering models only.
66. Screw (cylinder attachment)** - (2) - HU808
67. Washer (locking)** - (2) - WL208
** LH steering models only.
68. Brake Fluid (DOT 3, 1 litre) - (ar) - GBF103
69. Silicone Brake Fluid (0.5 litre) - (ar) - RX1327
Silicone Brake Fluid (1 litre) - (ar) - RX1326
70. Anti-Seize Grease - (ar) - RX1345
71. Brake Rubber Grease - (ar) - 514578
72. Brake Cleaner - (ar) - GBF901
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The 'Triumph', 'Rover' and 'British Motor Heritage' Logos used herein are Registered Trade Marks of British Motor Heritage Ltd,
and are used with their Licence under the Special 'Heritage' approval Scheme.
All original part numbers & illustrations have been reproduced by kind permission of British Motor Heritage.