When swapping out a 10 bolt with drums to a 9 bolt with disks all you have to switch brake wise is the master cylinder right?

 

I have been looking into this swap as well... just need brake pads and time to do it.

What I have found is that you may have to swap the MC depending on the year of the car, 89 and up you may not have to (could anyone clarify this). You will have to swap out the prop valve. You will also need new E-brake cables.

 

The only parts you have to swap are the parking brake cables if you want everything to work.

Now, technically you *should* swap out your proportioning valve. Just to get going down the road it's not a must however your braking will not be as good as your current drums.

 

Where is the proportioning valve?Isn't it on the master cylinder

 

When I replaced the 10-bolt drum with the 9-bolt disc only needed the Proportioning Valve & Parking Brake Cable for the 9-bolt. These were the only items changed besides fittings and hoses which you would normally do. This was done over two years ago and everything works great. Picture of the 11.655/ PBR
caliper on the 9-bolt rear.

 

The prop valve is below the MC a few inches, usually a machined block with the brake lines running into and out of it.

A few years back there was a very in depth thread about whether or not the MC needed to be changed. The general concensus that was reached is the differences between the two MC's is piston bore diameter. The only result that you would really notice when changing between the two is pedal "feel". IIRC, it was the earlier P/N that would give the the driver a better sense of braking effort (I could be wrong there, that thread was many beers ago). What I can tell you is I didn't change the MC when I converted my 86 and I did drive it for a short time with the drum prop valve until I *fixed* that.

 

Well I have the other car in the garage so I'll just swap out everything.Thanks for the info.