67 Fastback Front Disc Brake Replacement

Go with a slotted rotor, skip the cross drilled. The braking potential is maximized by the surface area of the face on the rotor. The cross drilled rotors tend to crack around the cross drilled locations and remove real estate from the rotor face. Slotted don't have the problem with cracking. The purpose of the cross drilling/slotting is to remove the gas that builds up between the rotor face and the pad. Unless you are REALLY running the car hard, slotted is all you need.

Larger than 12" rotor will require a larger rim. The largest factory rim was 15" which will fit the factory 11" rotor and I believe it will fit the larger 12" rotor from the tbird setup which is not a common upgrade anymore. If your wheels are factory type or size, you wont be able to go to a 13" rotor without buying new rims/tires too. Most kits for the front of these cars that are larger than a Granada setup are 13" rotors.

The biggest mistake with manual breaks is actually the master cylinder used. If your pedal is rock hard and the car doesn't stop easily, likely the bore of the MC is too large for you to use without a power booster, or your pads are glazed and not doing their job.

You can try a set of RAYBESTOS Part # SGD91M pads. These are a semi-metallic pad instead of an organic pad. The organic was standard on a regular Granada. The semi-metallic was standard on the police/taxi line. The organic is a softer compound and doesn't eat into the rotor but also produces much more gas which decreased the braking efficiency and causes break fade. The semi-metallic will not create as much gas under hard breaking conditions and will give a much more consistent experience under hard driving but will wear the rotor out much faster.

Centric parts bought StopTech (or maybe always owned them ?) and are the only source I found in my 1 minute of looking that has a slotted rotor, part numbers are CENTRIC Part # 12761010L and 12761010R.

Try those pads/rotors and you should get a better experience. If the pedal still feels rock hard and doesn't do anything better for you, you likely have a stuck/sticky piston in one or both calipers and/or a problem in the master cylinder.