i want to upgrade my master cylinder and brake booster to rs non abs model but i want to keep my stock brakes for now and prop valve will this cause any problems? i have front discs and drums in rear and most likely upgrade them later. disc in.

 

Until you upgrade the front rotors/calipers to Integra-sized parts you will have a rock hard bake pedal, and you can actually increase (which is bad) stopping distances if you go ahead and install the oversized Integra booster and master cylinder.

I've seen this two times first hand.

One was a customer of ours at the shop whom purchased a 15/16ths m/c (from a 1991 Civic EX) and had us install it (against my advice) even though he had the stock small 92-95 Civic CX/VX/DX front brakes. His pedal was rock hard and it felt like an old muscle car with no power brakes.

The other was on a friend's car whom ended up having to install the Integra RS booster/master cylinder before he was ready to because his stock Civic m/c started leaking. until he got the Integra front brakes to match the booster/master cylinder his pedal was also unresponsive and rock hard.

As long as you are CERTAIN you'll be upgrading those fronts to the 10.4'' or larger stuff you should be okay...just try to upgrade sooner than later.

 

i appreciate you replying. I knew you would have the answer to my question. I'll stick with my stock mc and booster with until i upgrade my brakes.

 

Wow great info....

I was trying to tell my buddy this a few months back but he just didn't get it.
I would of helped if I worded it better too... lol


?
so if the brake pedal is rock hard.... that is primarly due to the BB not the MC right?
I've heard of everyone saying to upgrated stock EF MC w/out upgrading from the 9.4' rotors.

 

Typically speaking a rock hard pedal is a problem with the booster.

In the case of a stock Civic with a rock hard brake pedal it would probably mean that the booster is bad, and that there is a vacuum leak from it.

In the case of "upgrading" the m/c from a 13/16ths to a 15/16ths before upgrading the front brake rotors/calipers/pads to larger units then the rock hardess is due to too much m/c volume as it relates to the smaller front brakes.

Rear drums/discs doesn't really affect any of this. The main issue is size of front brakes as it correlates to the size of the master cylinder. This also explains why those who only upgrade the front brakes to larger units without also stepping up the m/c size get a lower, softer pedal. Not enough m/c (edit) volume to accompany the increases front brake component volume.

 

I think you mean m/c volume. But that being said, there's nothing wrong with having a longer pedal travel from a smaller m/c to piston area ratio, it actually provides more torque and better modulation.

 

Yes I meant m/c volume.