[Jack21]

Thought I'd throw my hat into this one as I wrestled with the brakes issue also. My brakes, with the sticky 17" tires will lock the wheels if I stand on the pedal. Setup was selected with 15" wheels in mind.

The pedals are stock. Booster is a new OEM MII unit, with the vacuum line going to the #4 cylinder runner on the intake. (Vacuum line under the carb is used for the PCV)

Fronts are Stainless Steel Brakes MII upgrade setup. Uses Grenada 11" rotors, and SSBC 4 piston calipers. These calipers are the Kelsey-Hayes design, new from SSBC, originally used on '66 - '67 Mustang GT's. Purchased new font lines from SSB and they bolted right up. (Tie wrapped a piece of heater hose around brake hose to prevent chafing of brake hose by upper ball joint cotter pin.) Pads are from SSB. They're "Street" semi metallic. (Also puchased Street semi-metallic pads for T-bird Turbo Coupe from SSB to replace stock organic pads supplied with rear disk brake kit below.)

Rears are Ford Motorsport M-2300-C '79-up Mustang rear disk brake conversion kit. This was the recommendation from FMS tech support. The kit pirates the rear brakes off the '87 - '89 T-bird Turbo Coupe. Rotors are 10", and had to be re-drilled for 5 lug wheels. Calipers bolted right up with supplied brackets. Master cylinder bolted right up to MII booster without modification. Brake lines come out on the engine side. Kit includes adjustable rear brake valve, and modified proportioning valve. Kit also includes 2 sets of e-brake cables. I used the rubber covered ones. (SSBC may now carry this rear setup.)

My seup dialed in with the proportioning valve full open. Hope this helps some of you with what worked for me for brakes.