Brake controls - up to 1988

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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Saturday:	09.00pm to 12.00pm

Brake controls - up to 1988

PEDAL RUBBER-BRAKE & CLUTCH '59-'75 NON GEN

EXTENSION TUBE KIT(inc cap & seal)- SINGLE LINE M. CYLINDERS

USE: GPR104P

BRAKE PIPE-CONVERSION TO 12mm-USE WITH GMC227 LHD

BRAKE PIPE-CONVERSION TO 12mm-USE WITH GMC227 RHD

PUSH ROD-GMC173,198,192 &195 DUAL MASTER CYLINDERS

PUSH ROD- GMC159 & GMC160 DUAL MASTER CYLINDERS

CIRCLIP-GMC159 & GMC160 BRAKE MASTER CYLINDERS

SPRING-PRIMARY RETURN,GMC159 & GMC160 MASTER CYLINDERS

SPRING-PISTON RETURN,GMC159 & GMC160 MASTER CYLINDERS

REPAIR KIT-GMC227 DUAL BRAKE MASTER CYLINDER

REPAIR KIT-DUAL MASTER CYLINDER- SWITCH IN BODY

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