What all is involved in changing over small bolt patern front disc brake to large bolt patern on 72 Demon?
Small bolt patern to big bolt patern
- Thread starter andysauto1
- Start date
-
Get a bolt on kit from places like Dr diff
Or gather 73 up single piston parts.
Or gather 73 up single piston parts.
Professor Fate
Push the button, Max...
OR if they're working fine, just change your rotor.
Using mustang rotors for 4.5" bc
Using mustang rotors for 4.5" bc
Good advise
Professor Fate
Push the button, Max...
The Mustang rotor swap involves a little creativity and dinking around, but since you already have a good brake setup on the car it may be the most cost/time efficient solution.
4mulas
Fixem'up
You’ll need, new or new to you:
- upper control arms to accept the larger ball joints
- spindles
- caliper brackets
- calipers with hold down hardware
- 73 and up disc brake proportioning valve if you don’t have a pro valve already for Kelsey
- pads
- rotors
- soft brake lines
- lower ball joints
Some people retain their 67-72 upper control arms and put a sleeve over the ball joint stud (most call these ball joint adapters) but I personally would not go that route.
- upper control arms to accept the larger ball joints
- spindles
- caliper brackets
- calipers with hold down hardware
- 73 and up disc brake proportioning valve if you don’t have a pro valve already for Kelsey
- pads
- rotors
- soft brake lines
- lower ball joints
Some people retain their 67-72 upper control arms and put a sleeve over the ball joint stud (most call these ball joint adapters) but I personally would not go that route.
For the mustang rotors you will need a sleeve on the spindle where the seal rides. Due to the seal being a larger diameter. Also the inner bearing is a different number for the larger inside diameter. Otherwise it is a direct bolt on.
Using the mustang rotors is a much better choice. Why? because if you use 73 and up brakes you will have fenter to tire clearance with 6 inch wheels. The 73 brakes move the wheel out 3/8 to 1/2 inch and then add the extra 1/2 inch for the 6 inch wheel. Unless your running front runners tire size will be an issue.
One other plus with the 4 piston calipers is that they free wheel when released. The single pistons always have a drag and run hot. They also create a lot of brake dust and the whole assembly is much heavier.
All good aftermarket brakes are no less then 4 piston and at time 6.
Using the mustang rotors is a much better choice. Why? because if you use 73 and up brakes you will have fenter to tire clearance with 6 inch wheels. The 73 brakes move the wheel out 3/8 to 1/2 inch and then add the extra 1/2 inch for the 6 inch wheel. Unless your running front runners tire size will be an issue.
One other plus with the 4 piston calipers is that they free wheel when released. The single pistons always have a drag and run hot. They also create a lot of brake dust and the whole assembly is much heavier.
All good aftermarket brakes are no less then 4 piston and at time 6.
Last edited:
-
