Reply to "How many problems do you see?"

larrywMember

Isn't at least the initial sizing of the master cylinder bore actually about maintaining a certain ratio of the master piston to the slaves?

On a stock Pantera there are four 1.685" (43mm) diameter rear pistons, and up front we have two more at 1.685" and two at 1.335" (34mm). If I did the math right, that comes to 16.18 square inches of slave pistons. Figuring the ratios by using the master piston diameters we've discussed, it comes out to a 18.49:1 ratio for the 7/8" (22mm), 17.26:1 for the 15/16" (24mm), 16.18:1 for the 1" and 14.38:1 for the 1 1/8".

So, before committing to a certain size master, probably best to know the piston areas of the calipers you will be using. If your total slave piston area rises to around 19.4 square inches, you may want that 1 1/8" master to maintain the stock pedal feel of a Pantera. Or am I way off course with this?

6/25/215:56 AM

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