Brake problem on Fox Mustang...

Car has stock brakes all around. Stock MC with no power booster. The pedal has been modified for use with manual brakes. Problem is it had a soft pedal. Car seemed like it had a bad MC.

It's got new pads, shoes, calipers and cylinders all the way around. The new MC made it better, but not a hard pedal like I would expect. Any ideas?

Does it need a smaller bore MC because of the conversion to manual? Or is the stock MC fine since it still has stock discs/drums on it?

I bled the brakes real good too. Still no luck...

Car is for a friend of mine. It's BBF powered...

Stock power MC. Booster has been ditched. I modified the power pedal to be just like my stock manual pedal. This involved lowering the pedal in the pedal mount, shortening it and raising the pushrod hookup location.

Car next door has an "aftermarket" Mopar style with 4 wheel discs (Aerospace and Strange) and has a rock hard pedal and stops excellent from 120+...

Anybody know the bore size of this MC?

This a stock power brake MC. Is the thread size different on the manual brake MC? Just curious if I'll need to change lines or not. Car is an 89 model. I suspect the fittings are metric. It has the aluminum MC. I had saw somewhere where a late model Ranger had manual brakes and an aluminum MC... Any ideas? curious if it would be a direct swap and not have to swap from the 3 port style to a 2 port style, change fittings because of SAE vs metric, etc...

Pedal ratio is 6:1 just like Wilwood recommends...

This one is a "new" rebuilt unit from Autozone. Maybe it's bad too...

Not my car. I'll have him get another one...

Already checked that. They are tight. Brakes are crap. Won't even hold the car to powerbrake it... I'm at wits end here.

What will it being stuck do?

I thought it just limits flow to the rear? I've gotten clean fluid from each bleeder screw when I bleed it. Doesn't seem like any one is flowing slow or low.

The pedal is a copy of a factory Ford manual brake pedal. So the leverage should be correct. Wish I could find out the bore size on a manual MC vs a power one.

I can't bolt in a Ford cast iron manual MC due to the fittings being metric on the car and SAE on the manual MC. I'm looking for some adapters though.

I'm also going to bleed it one more time but with one fo those power bleeders. I didn't drive it but the owner did and he said it's not much better. I'll have to ask him if the MC has a warranty. IF so, it's going back to get replaced. I might also steal one off of a known good car to try. Just to rule out the MC ...

like a sumbitch...