Which brake combination gives the biggest force increase over the stock F150 setup?

The F350 master cylinder with Thunderbird front calipers and F350 rear cylinders: 43% front and 59% rear brake force increase, with 3182.6408 lbf caliper force and 375.3834 lbf rear force.

How much does the F350 master cylinder raise brake line pressure?

Line pressure increases from 1370.462 psi (stock F150 with 1-inch bore MC) to 1693.5082 psi with the F350's 1.0625-inch bore master cylinder.

What are the caliper bore sizes compared in this chart?

F150 front calipers have a 2.875 in bore (6.4918067 sq in area) while Thunderbird front calipers have a 3.09375 in bore (7.5172729 sq in area).

What booster diaphragm sizes are used in the calculations?

An 11-inch diaphragm (95.033178 sq in, 1026.3583 lbf boost assist) for F150 MC setups and a 9.25-inch diaphragm (134.40126 sq in, 1451.5336 lbf boost assist) for F350 MC setups.

What input assumptions does the spreadsheet use?

Engine vacuum of 22 in hg (10.8 psi) and a foot input force of 50 lbf for all configurations.

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Ford F150 Brake Upgrade Calculations - F350 MC & Thunderbird Caliper Comparison

Ford F150/F350 brake booster master cylinder force calculation spreadsheet comparison

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Spreadsheet comparing brake hydraulic force across F150/F350 master-cylinder, booster, caliper and rear-cylinder combos; 22 in-Hg vacuum yields 10.8 psi and up to 43% front brake force increase.

AI caption January 2013 · Photo 257 of 446

This document is a calculated comparison spreadsheet of Ford brake system upgrade combinations, comparing a stock F150 brake setup against four mixed-component configurations using an F350 or F150 master cylinder with F150, Thunderbird ("tbird"), or F350 front calipers and F150 or F350 rear wheel cylinders. For each configuration it lists engine vacuum (22 in hg = 10.8 psi), a 50 lbf foot input force, booster diaphragm diameter and area, boost assist force, master cylinder bore and area, resulting hydraulic line pressure (psi), front caliper bore/area and caliper clamping force, rear wheel cylinder bore/area and rear force, front-to-rear force ratio, and percentage increases in front and rear brake force versus stock. Key results: the F350 master cylinder combinations raise line pressure from 1370 psi to about 1694 psi; the F350 MC with Thunderbird front calipers and F350 rear cylinders yields the largest gains (43% front, 59% rear brake force increase) with a front/rear ratio of 8.48. Color coding (red/yellow/green) highlights weaker versus stronger results. A reader can use this to evaluate which parts-swap combination gives the best braking force improvement for a Ford F150.

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Frequently asked questions

Which brake combination gives the biggest force increase over the stock F150 setup?: The F350 master cylinder with Thunderbird front calipers and F350 rear cylinders: 43% front and 59% rear brake force increase, with 3182.6408 lbf caliper force and 375.3834 lbf rear force.
How much does the F350 master cylinder raise brake line pressure?: Line pressure increases from 1370.462 psi (stock F150 with 1-inch bore MC) to 1693.5082 psi with the F350's 1.0625-inch bore master cylinder.
What are the caliper bore sizes compared in this chart?: F150 front calipers have a 2.875 in bore (6.4918067 sq in area) while Thunderbird front calipers have a 3.09375 in bore (7.5172729 sq in area).
What booster diaphragm sizes are used in the calculations?: An 11-inch diaphragm (95.033178 sq in, 1026.3583 lbf boost assist) for F150 MC setups and a 9.25-inch diaphragm (134.40126 sq in, 1451.5336 lbf boost assist) for F350 MC setups.
What input assumptions does the spreadsheet use?: Engine vacuum of 22 in hg (10.8 psi) and a foot input force of 50 lbf for all configurations.