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Best Master Cylinder Size for Front Disc Brake Conversion

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Quicksilver914

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I have a '59 BN6. Just installed front disc brakes. The existing master cylinder is, to say the least, very uninspiring. I can get a 3/4 or 7/8 master.
Does anyone have an experience with one or both?
 
Stock for early 3000 front disk brake systems was .625 master (same as clutch). This works well but has a somewhat long stroke.

Stock for the all drum brake cars was .750 where a larger volume of fluid was needed.

For front disc cars, a lot of folks use a .070 master which as a bit shorter stroke but requires a bit more pedal pressure.

The .750 when used with front disks is even shorter stroke and even more pedal pressure (IMO, too much pedal pressure required).

Genuine Girling masters in all 3 sizes are available at Pegasus. Pegasus
 
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