Brake controls - up to 1988

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WASHER-SPRING, 5/16''
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Automatic models.
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SET SCREW- 5/16 UNF x 5/8''
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NUT - 5/16" UNF
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WASHER- PLAIN 3/8 ID SMALL OD
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Brake Pedal and Pedal Box
Ill. No. Part No. Description Qty. Rqd. Remarks
1 21A1426 BRAKE PEDAL ASSEMBLY 1 1959-75; RHD std. performance models, plus 1961-62 Cooper.
  21A101 BRAKE PEDAL ASSEMBLY 1 1959-75; LHD std. performance models, plus 1961-62 Cooper.
  21A1065 BRAKE PEDAL ASSEMBLY 1 1962-75; RHD, Cooper, Cooper S and 1275 GT.
  21A1066 BRAKE PEDAL ASSEMBLY 1 1962-75; LHD, Cooper, Cooper S and 1275 GT.
2 NAM3112 BRAKE PEDAL ASSEMBLY 1 1976-88, RHD.
  NAM3111 BRAKE PEDAL ASSEMBLY 1 1976-88; LHD.
3 2A3034 BUSH, brake pedal 1 Included in brake pedal assembly.
4 GPR104A PAD, brake pedal 1 1959-75.
  GPR104P PAD, brake pedal 1 1959-75. Non-genuine.
5 GPR107 PAD, brake pedal 1 1976-88.
6 2A5880 SHAFT, brake and clutch pedals 1  
7 LNZ205 NUT, nyloc 1  
8 2A5652 SPRING, brake pedal return 1 Manual models.
9 31G398 SPRING, brake pedal return 1 Automatic models.
10 31G397 SPACER, pedal 1 Automatic models.
11 2A5859 PEDAL BOX ASSEMBLY 1 1959-71, single line brakes.
  21A2467 PEDAL BOX ASSEMBLY 1 1971-75, single line brakes.
  21A2056 PEDAL BOX ASSEMBLY 1 1969-71, dual line brakes.
  21A2345 PEDAL BOX ASSEMBLY 1 1971-75, dual line brakes.
  NAM8670 PEDAL BOX ASSEMBLY 1 1976 on, dual line brakes.
12 21A2348 CLAMP, pedal box 1 1971-75, dual line brakes.
13 21A1657 PLATE, locating 1 1959-75, models fitted with steering lock.
14 SH605051 SCREW, pedal box to body 2  
15 LWZ205 WASHER, locking 2  
16 CLZ512 CLEVIS PIN, pedal to master cylinder push rod 1  
17 GHF502 SPLIT PIN 1  
18 RC001 'R' CLIP 1 Alternative to split pin; MUCH easier to fit!
19 31G279 GASKET, master cylinder to pedal box 1 Single line master cylinders.
  31G840 GASKET, master cylinder to pedal box 1 Dual line master cylinders.
20 NAM1718 SPACER, master cylinder A/R Dual line master cylinders; if required.
21 FNZ505 NUT, master cylinder to pedal box 2  
22 LWZ205 WASHER, locking 2  
23 31G842 PEDAL STOP, with brake switch housing 1 1969-80, dual line brakes.
24 31G843 PLATE, locking pedal stop 1 1969-80, dual line brakes.
25 LNZ206 NUT, nyloc, stop to plate 1  
26 PWZ106 WASHER, plain 1  
27 SH605051 SCREW, plate to body 1  
28 LWZ205 WASHER, locking 1  
29 FNZ105 NUT 1  
30 FAM4370 BRACKET, brake light switch 1 1980 on.
31 NH106041 NUT, bracket to body 1  
32 WC106041 WASHER, plain 1  
         
Master Cylinder
Single Line Brakes 1959-75
At first, drum braked Minis and Mini Coopers were fitted with 0.75" bore master cylinders, but to increase pressure (and thereby hopefully improve braking power) standard models were upgraded fairly quickly to a 0.70" bore cylinder, while Coopers received a 0.625" bore cylinder, losing their hydraulic booster at the same time. By the 1990s the 0.70" bore cylinder was being manufactured with a plastic reservoir rather than the original metal one, but thankfully pressure (and money) from the classic car industry were brought to bear on the manufacturer who now also produces an original style cylinder, complete with metal reservoir.
         
The Cooper 0.625" bore cylinder is, at time of writing, no longer available, owners using the 0.70" cylinder as a replacement. Occasionally a few repair kits surface for the 0.625" cylinder, so we would advise Cooper owners to contact us to see what's available before purchasing a new 0.70" bore cylinder.
         
Mini Cooper S and 1275 GT models with single line brakes now share the 1275 GT's master cylinder, in terms of what's available (or likely to be). While both the Mini Cooper S and 1275 GT were fitted with a couple of master cylinders during their production histories, they all share the same two features of the cylinder now available: 0.70" bore and 75mm high reservoir (noticeably taller than the standard Mini master cylinder reservoir).
         
An important note to owners who've ascertained that they have a 0.70" bore master cylinder on their Mini which requires a rebuild using a master cylinder repair kit: Around 1977 the master cylinder manufacturer changed the design of the piston in the cylinder to incorporate two ring seals instead of the previous one ring seal and one cap (or blind) seal. Most - but not all - master cylinders available since that time are of the later design, which may be identified by a circle or groove cut into the body of the cylinder. Be sure to identify which cylinder you have before ordering internal parts for it!
         
Ill. No. Part No. Description Qty. Rqd. Remarks
33 GMC153 MASTER CYLINDER ASSEMBLY, 0.75" bore 1 Drum braked Minis, 1959-62 approx., plus Coopers with hydraulic booster, 1961-62. With original style metal 60mm high reservoir.
  GMC171OE MASTER CYLINDER ASSEMBLY, 0.70" bore 1 Drum braked Minis, 1962 approx. to 1975, with original style metal 60mm high reservoir. May also be used in place of GMC105 master cylinder.
  GMC171 MASTER CYLINDER ASSEMBLY, 0.70" bore 1 Alternative with plastic reservoir.
  GMC105 MASTER CYLINDER ASSEMBLY, 0.625" bore 1 Coopers without hydraulic booster, 1962-69, with original style metal 70mm high reservoir.
  GMC172 MASTER CYLINDER ASSEMBLY, 0.70" bore 1 Cooper S and 1275 GT, 1963-75, with original style metal 75mm high reservoir.
         
From the mid-1960s, France, Belgium, The Netherlands and Luxemburg required a master cylinder with an easy visual check for fluid level - the answer on the Mini was to screw a translucent plastic extension to the top of the reservoir. Also used as a Special Tuning part and still available today, this extension can of course be fitted to any single line master cylinder and not only provides an easy fluid level check but also usefully increases capacity of the reservoir for disc brake conversions etc.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
34A BHA4661K EXTENSION KIT, reservoir 1 Includes extension tube, seal and plastic cap (non-genuine).
34B BHA4661 EXTENSION, reservoir 1  
35 BHA4660 CLIP, locking extension 1  
36 BCA4964 SEAL, extension 1  
37 17H3723 CAP, reservoir, metal, with seal 1 1959-63 approx.
38 501524 SEAL, metal cap 1 Included with cap.
39 513123A CAP, reservoir, plastic 1 1963 approx. on.
40 GRK1026 REPAIR KIT, master cylinder 1 For 0.75" bore cylinders.
41 17H7124 SPRING, return 1 For 0.75" bore cylinders.
42 17H7560 CIRCLIP 1 For 0.75" bore cylinders.
43 17H7557 PUSH ROD 1 For 0.75" bore cylinders.
44 GRK1028 REPAIR KIT, master cylinder 1 For 0.70" bore cylinders with ring seal and end cap (see note).
45 GRK1006 REPAIR KIT, master cylinder 1 For 0.70" bore cylinders with two ring seals (see note).
46 27H7751 SPRING, return 1 For 0.70" bore cylinders.
47 17H7560 CIRCLIP 1 For 0.70" bore cylinders.
48 17H7952 PUSH ROD 1 For 0.70" bore cylinders.
49 M795 REPAIR KIT, master cylinder 1 For 0.625" bore cylinders.
50 17H8070 SPRING, return 1 For 0.625" bore cylinders.
51 17H7560 CIRCLIP 1 For 0.625" bore cylinders.
52 17H7952 PUSH ROD 1 For 0.625" bore cylinders.
53 17H7555 ADAPTOR, cylinder to brake pipe 1 Early original cylinders only.
54 17H7556 SEAL, adaptor 1 Early original cylinders only.
         
Dual line Brakes 1969-88
Initially Mini dual line braking systems, introduced because of local markets regulations, separated the front brakes from the rear. This system was later supplemented by two diagonally split systems, the layout of each depending on whether the car was RHD or LHD. In 1980 a complete return was made to a front/rear split system on Saloons, with the Estate, Van and Pick Up soldiering on for a couple more years with the diagonally split set up. Naturally, each system required a different master cylinder! Many diagonally split system Minis have subsequently been converted to the preferred later front/rear split system.
         
Between 1976 and 1980 the braking system was converted from imperial to metric; thus the last diagonal split master cylinder is metric, along with most of the front/rear split master cylinders from that period onwards .
         
Important note for owners replacing master cylinders on 1980-85 front/rear split Minis (plus 1275 GTs 1978-80): From 1985 on, a master cylinder with a revised lower pipe union size of 12mm was introduced, identifiable by a yellow plastic band. This cylinder, GMC227, is also used as the replacement for 1980-85 front/rear split cylinders, which means that a conversion brake pipe kit also has to be fitted if replacing an original cylinder on those years of Minis.
         
Ill. No. Part No. Description Qty. Rqd. Remarks
55 GMC159 MASTER CYLINDER ASSEMBLY, with imperial unions 1 For front/rear split systems, 1969-75. With round reservoir.
  GMC160 MASTER CYLINDER ASSEMBLY, with imperial unions 1 For diagonally split systems, 1974-75. With round reservoir.
56 GMC167 MASTER CYLINDER ASSEMBLY, with metric unions 1 For diagonally split systems, 1976-82. With square reservoir and switch in cylinder body.
  GMC168 MASTER CYLINDER ASSEMBLY, with imperial unions 1 For front/rear split systems, 1976-80 (Canada only). With square reservoir and switch in cylinder body.
57 GMC173 MASTER CYLINDER ASSEMBLY, with imperial unions 1 For front/rear split systems, 1980 (1978-80, 1275 GT). With square reservoir and switch in cylinder body.
58 GMC198 MASTER CYLINDER ASSEMBLY, with metric unions 1 For front/rear split systems, 1980-82 (alternative to GMC173). With square reservoir and switch in cap.
  GMC192 MASTER CYLINDER ASSEMBLY, with metric unions 1 For front/rear split systems, 1982-84. With square reservoir and switch in cap.
  GMC195 MASTER CYLINDER ASSEMBLY, with metric unions 1 For front/rear split systems, 1984-85. With square reservoir and switch in cap.
  GMC227 MASTER CYLINDER ASSEMBLY, with metric unions 1 For front/rear split systems, 1985 on. With 12mm lower union, square reservoir and switch in cap. Also use to replace GMC173, GMC198, GMC192 and GMC195, along with conversion kit BAU5654 (RHD) or BAU5655 (LHD).
59 AAU3815 CAP, reservoir 1 For GMC159 and GMC160 master cylinders.
60 AAU8240 CAP, reservoir 1 For GMC167, GMC168 and GMC173 master cylinders.
61 GRK901104 CAP, reservoir, with fluid warning switch 1 For GMC198, GMC192, GMC195 and GMC227 master cylinders.
62 AAU1752A SWITCH, fluid warning 1 For GMC167, GMC168 and GMC173 master cylinders.
  AAU3821 SWITCH, fluid warning 1 For GMC168 master cylinders.
63 GRK1019 REPAIR KIT, master cylinder 1 For GMC159 and GMC160 master cylinders.
64 GRK1002 REPAIR KIT, master cylinder 1 For GMC167 master cylinder.
  AAU8241 REPAIR KIT, master cylinder 1 For GMC168 master cylinders.
65 GRK1016 REPAIR KIT, master cylinder 1 For GMC173, GMC198, GMC192 and GMC195 master cylinders.
  GRK1035 REPAIR KIT, master cylinder 1 For GMC227 master cylinder.
66 37H2763 SPRING, piston return (use with GRK1019 repair kit) 1 For GMC159 and GMC160 master cylinders.
67 37H2764 SPRING, primary return (use with GRK1019 repair kit) 1 For GMC159 and GMC160 master cylinders.
68 27H8445 CIRCLIP (use with GRK1019 repair kit) 1 For GMC159 and GMC160 master cylinders.
69 37H2769 PUSH ROD 1 For GMC159 and GMC160 master cylinders.
70 BAU1273 PUSH ROD 1 For GMC173, GMC198, GMC192 and GMC195 master cylinders.
71 BAU5654 BRAKE PIPE KIT, conversion to 12mm union 1 RHD; use when replacing GMC173, GMC198, GMC192 or GMC195 with GMC227 master cylinder.
  BAU5655 BRAKE PIPE KIT, conversion to 12mm union 1 LHD; use when replacing GMC173, GMC198, GMC192 or GMC195 with GMC227 master cylinder.
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