Ok I've search on here and read a few articles but I am still stuck. I have a 99 Civic DX Hatch and I am trying to swap out my drums for 99 Civic Si rear disc brakes. I know you have to replace the master cylinder so I was looking at this

http://www.car-stuff.com/carparts/ho...mc3903231.html

In the listing it says 7/8 in size. But I thought you need the one stating its 15/16 in size. Sorry if it’s dumb questions just need to know if that the right part I need.

 

there are a **** load of posts about rear disk conv.

even a few D.I.Y with all parts included

and just get the master cylinder of a 99-00 si.

EDIT: read this. https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/all-end-all-how-can-i-put-x-brakes-y-car-152884/

 

The EX MC is also 15/16", same as the Si.

I have a 1" MC from a '99-'01 Integra that I chose not to use for my brake swap, includes booster. PM me if you're interested.

 

Well what I'm wondering is the one I have listed in the link says it work for 99 Civic si but it says it 7/8 and not 15/16. Trying to see if I can buy that one because I'm a little tight on cash and its new.

 

The 99-00 Si came with a 7/8 MC, it is NOT a 15/16 MC like the Integra. I know because I did this swap on my old EK Sedan and on my current EK hatch. The 7/8 Si MC will work just fine, you will notice the difference with it and you can keep your stock brake booster and prop valve.