My manual that came with 2457, January 2000 describes cutting the brake pedal. If you're not using power brakes, it's recommended that the pedal should be cut and mounted in the "manual" brake location of the pedal box.
The brake pedal mod is discussed in the manual. It is not necessary. It does increase the mechanical advantage of the pedal. If you choose not to do it you will push some harder on the pedal to get the desired braking. Modify the pedal and less pressure needed. Your choice
Instructions for cutting the pedal were in my manual (2582) and I did like it said. For a stock brake, non-boosted installation it's the way to go. I have no trouble locking 'em up and pedal effort under normal braking is reasonable.
A word of warning. If you're thinking of converting to a boosted system some time in the future, don't cut the pedal. One of the guys I know had the cut pedal and later added the GN booster. The combination of pedal leverage and power brakes was wicked. The first time he tried the brakes he was turning slightly. They grabbed so hard and quick he knocked the front end out of alignment !
Before you go thru the effort of cutting and welding, go to the salvage yard and look for a 4 cyl Mustang.
I pulled one out of a '79 4 cylinder Mustang with manual brakes. It's the exact same thing as doing the modification but it only cost me $7.00
I was also real lucky that someone else already took the seats out so it was easy to get to.
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