How can I find out my MC bore and what p-valve I have?

I have a 1993 Del Sol Si and it has rear discs stock.

 

nevermind, figured it out

idk if i care enough to swap this out, my brakes work fine
lol

 

Yeah, EX coupes didn't have rear disc, boo. Either way, I wouldn't have swapped out the P-valve and MC if I didn't take my car on tracks like I do. When I'm going 120 I need the reassurance that my car will be able to get back to 50-60 for the turns! lol

 

So I did some research and it looks like (I think) my P-valve is 40-40, but my MC is 13/16. I may upgrade the MC in the future. I was not aware of this easy brake upgrade until you mentioned it in your thread, so i'm really glad I read it because someday i'm definitely going to do this, maybe with a 1" bore MC out of a Integra GSR. I may buy that soon, because there's a GSR at the junkyard with MC and booster still in it in good condition.

 

There is a point at which having a bigger MC would hurt braking. That would be when very lightly tap the pedal and your brakes lock up. Normally people upgrade to the 1" if they do a big brake swap or something, but heck why not. I've just heard that replacing a booster is annoying.

 

So do you think 1" bore would hurt braking or would that be where you would draw the line?
The reason i'd replace the booster is because mine is all rusty and when i got my brakes inspected tires plus told me it was probably going to go out soon.

 

Well, I can't speak from personal experience but, right now with a 15/16 MC the feel of my brake pedal is exactly were I want it. It's not too touchy, but it definitely brakes.

My assumption if I went up to the 1" that my braking would be just a tad more touchy than I would like. But that's just me. Give her a try and let us know!!

 

I have rear discs from the factory but for some reason my MC is still the same as a Civic without rear discs.

My p-valve is something weird.. 17-25... I don't think i'll be changing that out, it seems like it's probably that way for a reason. If I upgrade MC i'll do the 15/16 also.

 

When doing brake upgrades (such as increasing rotor size) all four brakes should increase in size proportionately, then all you need to do is replace the mc, if you're upgrading the front knuckles and rotors, then you'll most likely you'll need a new mc and pv, when doing a rear disc conversion, make sure the pv is the same in your car as the donor car with the original brakes, then slightly upgrade the mc. If you have abs brakes, don't worry too much about mc sizes. When you're working with non-abs brakes, then mc sizes are a large concern.

 

^ yep ditto