So I swapped disc brakes from a 94 Civic with ABS and im wondering if i need to swap MC and prop valve?

yes I've Googled and not only can I not find a definitive answer but i dont get the jargon lol...

I have a 95 Civic DX

Any help would be grrreeat

 

The rear discs don't require more fluid than drums. You'll be fine with the stock master & booster.

You only need to move up in master size if you swap out the fronts for larger calipers. The calipers with 54mm piston require larger 7/8" master cylinder (found on 94 Del Sol VTEC). The still larger 57mm piston calipers require a 15/16" master cylinder from the 90-91 Civic EX Sedan. Both these masters will bolt to your factory booster so no need to change that out.

The 54mm calipers with 7/8" master & rear discs is the best as far as easy bolt on. It provides brake bias that is very close to an Integra Type R (just with smaller rotors). Your setup now with small front discs and small rear discs is VERY rear biased, This means you do run the risk of locking the rears first and loosing stability under emergency stops. I suggest you test out your max braking after you get the new pads fully bedded in. That way you are sure you know what to expect in an emegency. I ran this setup for years and it is definitely less stable in emergencies, so I know my match checks out. Was WAY better once I upgraded to the fronts to the 54mm non-abs 93-95 EX Coupe calipers.

 

Dude very informative thank you very much.gonna start to look for them bigger calipers😎😎😎

 

I forgot to mention you will need the knuckles to go with those calipers. The mount spacing is different for larger brakes (10.2" & 11.1" rotors).

You may be able to use s2000 or ep3 calipers with your stock knuckles and larger rotors (I'm not 100% sure). They also have 54mm caliper pistons.