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The very early Mini had a brake master with .75" bore size. It used a cup on one end of the plunger and a seal on the shaft. not very common so the method to be sure is to measure the bore size before ordering. All complete replacement master cylinders are .70 bore. The first brake master in the Sprites & Midgets from 1967 also use this rebuild kit where the master cylinder body has no groove in it.
Classic Mini early brake master cylinder kit 3/4 bore

Classic Mini early brake master cylinder kit 3/4 bore

Classic Mini early brake master cylinder kit 3/4 bore
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Classic Mini early brake master cylinder kit 3/4 bore

Selected: Early brake master cylinder kit .75" bore GMC153
Part No: 8G8258
CLEARANCE Price $2.96
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List: $9.90 You save: $6.94
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Classic Mini
Sprite & MG Midget
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Select variations below for more info:
Early brake master cylinder kit .75" bore GMC153
$2.96
GMC159 rebuild kit sold each
$38.90
GMC227 rebuild kit sold each
$57.90
GMC171 or GMC172 rebuild kit
$11.90
1995 and later brake master rebuild kit sold each
$49.90
GMC171 2 ring brake rebuild kit sold each
$17.90
GMC90376 brake rebuild kit sold each
$21.90
This kit includes the rubber parts need to rebuild a GMC159 master cylinder.
Brake master cylinder repair kit for GMC227 dual line master cylinder 1985-88 with yellow identity band. This kit will not fit later brake master with servo built in as fitted from 1988 on
Almost every Mini built prior to the dual circuit system uses a .70" bore master cylinder. This kit fits all .70" bore, single line brake masters that use a "cup" seal for the top seal. The original size in the '59-'64 Mini was .75" but as most of these cylinders have been replaced with the .70" size it is best to check the very early models.
See GRK1006 for the "ring" seal repair kit.
88G8689 is the kit for GMC171 and GMC172.
Master Cylinder repair kit fitted for repairing the late master cylinder that was attached to the servo from 1995 until the end of production. Similar to GRK1032, but uses a longer seal in conjunction with a nylon bearing.
All the single line .70" bore brake master cylinders as used on the Mini are NOT the same! They may look and function the same but some used an upper "cup" seal and some used and upper "ring" seal. This is for masters using the upper ring seal.
For the upper cup seal kit see 8G8689.

One of the brake master cylinders used on some of the later model Minis is a GMC242, now GMC90376. If you decide that rebuilding it is the best option, then this seal kit includes all the internal rubber bits you will need to do the job right. Very inexpensive compared to the price of new master cylinder! For brake master cylinder with built in servo fitted from October 1988 to 1995 with drill hole in the foot of the master cylinder. Master cylinders made from 1995 need repair kit GRK1039, Green plastic band around cylinder.

The very early Mini had a brake master with .75" bore size. It used a cup on one end of the plunger and a seal on the shaft. not very common so the method to be sure is to measure the bore size before ordering. All complete replacement master cylinders are .70 bore. The first brake master in the Sprites & Midgets from 1967 also use this rebuild kit where the master cylinder body has no groove in it.
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