Disc/drum manual conversion questions

[Deerejeep]

'81 CJ7 . Disc/drum manual. 35" street is the intended usage. I currently have the engine out and easy access to the brake lines. I'm thinking this is a good time to just replace the original lines. No signs of damage. Currently manual brakes. I have a power booster that was part of my CJ purchase.

I figure that a rear drum to disc conversion will be a late rebuild add as it can be done just as easy at this stage as the final stage. My questions are this:

Are the hard lines the same for standard and power? Classic tube shows 2 kits.

Is the master cylinder the same for disc/drum as disc/disc?

Is the master cylinder swappable from the manual to power booster setup?

It would be nice to run power disc/drum to start up with and convert to disc/disc later on. I just want to be flexible. Appreciate the help.

Pictures of what I have.

 

[tarry99]

'81 Cj7. Disc/drum manual. 35" street is the intended usage. I currently have the engine out and easy access to the brake lines. I'm thinking this is a good time to just replace the original lines. No signs of damage. Currently manual brakes. I have a power booster that was part of my CJ purchase.

I figure that a rear drum to disc conversion will be a late rebuild add as it can be done just as easy at this stage as the final stage. My questions are this:

Are the hard lines the same for standard and power? Classic tube shows 2 kits. When engineers do there volume calculations sometimes a larger line is supplied to the rear because of the distance

Is the master cylinder the same for disc/drum as disc/disc? No disc takes more volume and normally has a larger bore The cylinder in the picture that has a small and a large reservoir is for a disc/ drum application

Is the master cylinder swappable from the manual to power booster setup? Bolt pattern is the same

It would be nice to run power disc/drum to start up with and convert to disc/disc later on. I just want to be flexible. Appreciate the help. That can be done with the right components

Pictures of what I have.

Keep in mind brake systems are designed and not thrown together.........total pressure along with total volume and proper pedal ratios are all part of the equation.

 

[73CJ]

Well I put 78 Monte Carlo calipers with a CJ7 front rotors. Made the brackets that bolt to the bearing retainer 5/16" plate.

The rear needs a proportioning valve.

I used a stock disc/drum master cylinder. No problem. IMO you don't need a booster.

I keep asking why did I wait so long?

 

[Deerejeep]

Keep in mind brake systems are designed and not thrown together.........total pressure along with total volume and proper pedal ratios are all part of the equation.

I sure do appreciate the quick and detailed response. Especially your last line. I needed to decide on a direction and just go. Tore out the front lines and MC tonight and ordered the power lines from classic. I'll seek out a power disc/disc MC and see how good the power booster looks after some clean up. Probably will have more questions. Just decided that I want the best braking power I can get.

I sure do appreciate the quick and detailed response. *Especially your last line. *I needed to decide on a direction and just go. *Tore out the front lines and MC tonight and ordered the power lines from classic. * I'll seek out a power disc/disc MC and see how good the power booster looks after some clean up. *Probably will have more questions. * Just decided that I want the best braking power I can get.

Well I put 78 Monte Carlo calipers with a CJ7 front rotors. Made the brackets that bolt to the bearing retainer 5/16" plate.

The rear needs a proportioning valve.

I used a stock disc/drum master cylinder. No problem. IMO you don't need a booster.

I keep asking why did I wait so long?

So your saying you can go disc/disc power it's the same MC?