Might get made fun of for even asking this but in the hunt for the parts to rebuild my hatch STD parking brake delete, I've had the chance to get complete disk trailing arms for a steal. Can I drop them into my car without changing the booster master and prop valve as I've already replaced all 3. What exactly would happen if ran them with my current setup?

 

I’m currently running the stock master and prop with some da trailing arms and it certainly brakes better than it did stock. I’m excited to get the new master and prop but have no time right now. To be fair before the conversion my drums blew so my brakes felt like wet cardboard.

 

They work OK? I Read somewhere that a stock drum prop valve is valved different so on disks they are too weak but im not sure haven't looked into it in months

 

I would say from what I've read when I did my rear disc brake swap though I'm no expert, you would probably just need to use a prop valve from a 90/91 crx si or one from a DA integra. Maybe newer integras could be used but not sure it's ratio. No need to change the master cylinder or brake booster as that would mostly apply to the front calipers being used.
I use the DA's master, booster, prop valve with my DA rear disc swap with all around braided lines just because I had them given to me for free and it stops damn good but read years after the swap from a posting I didn't need to change out some of the parts because I still run the stock si front calipers. Just my thoughts..

 

I believe proportioning valve & master cyl would be changed if you were also fitting the larger front calipers usually paired with rear discs on Integra's & top spec Civics.
Those front calipers have bigger wheel cylinders. Hence need more fluid.

 

I have done it twice on a CRX with the stock prop-valve. No issues ever.

 

I Went and got the arms for only a C note. What parking brake cables do i need both of mine are cut

 

Don't remember any problems using EK disc brake cables though they might be slightly longer.
Believe EG, EK & DC Integra hatch (integra sedan longer) cables are all the same if equipped with discs. L&R slightly different lengths
Was given a bent trailing arm so swapped hubs onto old trailing arms, needed some heat to remove loctited torx bolts.

Think I was also supplied reject rubber pivot bushings (several times!) as mounting bar through the middle was too far off-centre, so measure distance of mounting bolt holes from arm before removing from the arm if you need to do that at the same time.
DA pivot bushes are a relatively obscure size making replacements harder to find.