I just installed this with Porterfield pads in the OEM front calipers. At the rear I have Brembo 4 pistons calipers and I have Ferrodo DS 1.11 pads. Even with the original pedal the effort is acceptable, you obviously have to press harder than with the brake servo, but it is very correct.
The master cylinders have a diameter of 5/8'' and 11/16''
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