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Showing results for tags 's12'.
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Hi All, I decided to compare master cylinder area to total caliper piston areas for common Z part combinations and apply hydraulic principals. Note: The total caliper area is the area summation for all pistons in both calipers. From the data, it is clear to the Sumitomo 4 pot (Toyota S12-8) caliper upgrade has minimal area change from stock (2%) thus there is no significant change in required pedal pressure nor pedal travel. With reference to the table, the common upgrade to a 15/16" master and S12-8 calipers will increase pedal pressure by 11% but reduce pedal travel by 11%. For a 240z or 260z, this will reduce pedal travel from 140mm to 126mm (which is what an 82 280zx's stock travel is) Stock brake pedal strokes 72 240z: 140mm 74 260z: 140mm 75-78 280z: 123mm 82 280zx: 125mm Pedal height from floor is 203mm Examples: adding a S12-8 calipers to a 72 240z will increase pedal travel from 140mm to 143mm adding a S12-8 calipers and 3/4" master to a 72 240z will increase pedal travel from 140mm to 195mm (not good as maximum travel is 203mm) Data: Stock Datsun 240z to 280z caliper has two 53.98mm pistons (I could only find 72-78 data) S12-8 caliper has two 42.82mm & two 33.93mm pistons S12-W caliper has four 42.82mm pistons I hope this is useful
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Can you use an aftermarket rotor such as the vented, slotted and cross drilled rotors of r1 concepts that are made for the stock 240-280z calipers with the S12, S12W or later 86-88 S12+8 Toyota calipers without using the rotor spacer? I am trying to save the $100-150 cost of the spacer. Thanks, John
