What's up my fellow honda enthusiasts, I have a bone stock 91 civic hatch std and I'd like to upgrade the braking system and I was wondering if this setup would improve it

91 ef sedan EX master brake
90-93 integra brake booster
90-93 integra 40-40 proportioning valve non ABS
Crx si or ef hatch si rear trailing arms

Any adivce with this setup would be greatly appreciated.

 

Most of its been covered a thousand times. Ill say for the hassle of switching brake boosters its not worth it though. But if you did change the boosters you have more master cylinder options with the integra booster.

 

Simple answer is yes it will improve somewhat but because you inquired about those specific parts it seems you have already done some research (and as stated covered a thousand times). So do you have a more specific question regarding this setup outside of something so general? Keep in mind that that front brakes do a majority of the work.

 

Listen to this part more than anything else. I would just go with bigger front discs, DA in my case. The rear drums are fine. They heat up on the circle track, sure, but the braking difference is not big enough to justify the swap for me. You could end up with more issues than improvement.

 

I've done alittle research but nothing major came back to using these specific parts but apparently using these main parts helps out a lot. I haven't don't anything to the car yet, it's still sitting on drums and ef std knuckles, I was just wondering if the booster and so forth with all the other parts will fit? And what would be the downfall if this could cause more problems instead of actually helping?

 

Give me a few weeks Tyler. I'll have my upgraded brakes on my CRX and I will let you know results. I'm not using some of the things you listed specifically, but some things very close and similar. But yes over all that setup will improve the brakes

 

Sweet another crx build? Yea man let know how it goes dude.

 

Why would you need a different booster?

I don't think that the Civic EX MC will bolt onto a Integra booster.
If you absolutely need to replace your booster and are going to use the Civic EX MC, I know for fact that the MC bolts right up to the DX, Lx and Si boosters. I would assume it bolts directly on to the STD and HF booster as well.

EF hatch Si rear trailing arms?
Why? They aren't disc.
Only 90-91 CRX Si had disc - they bolt right up.
90~93 Integra trailing arms should bolt right up as well.
You can also source rear disc from 92~00 Civic and 94~01 Integra.

You do NOT need the entire trailing arm.
You can keep your stock trailing arms and mount the spindle/hub from the donor.

You left out e-brake cables from your parts list if you are trying to go rear disc.

 

That's interesting, I've read the EX master will bolt onto the integra booster which gives it more braking power, which also is needed for the non ABS proportioning valve (40-40).

I'm going to try this anyway and I will come up with a final solution of how it all worked and when I used to make it work better but If anyone has an input on this plz feel free.

 

I know the 90-91 trailing arms only came disk and that's what I'm talking about. If you use DA trailing arms or eg civic the e brake cables are too long.

 

I edited my post while you were typing... sorry.

The booster doesn't give more power.
Just like power steering doesn't add more steering power.

It simply makes it a little easier to press down on the brake pedal.
Bigger booster also takes more vacuum. People (including myself) have used the 1" ITR MC and Booster and found that the booster can mess with the idle on a D-series.


BTW: if you aren't swapping out the front brakes for larger calipers, then your choice of an EX MC is overkill and doesn't fit your brake system.
It will NOT add braking power in any way to help you stop your car sooner.
It WILL help you to lock up the wheels sooner though since you won't have as much pedal travel to modulate the brakes with.
Keep your stock MC if you aren't changing the front brakes!

 

Another thing to throw out there is upgrade your brake lines!

 

I'm sorry I prob forgot the most important figure piece in this whole discussion. I am swapping the DPFI d series to a GSR. I do plan on using DA front spindles with the calipers, along with rear trailing arms from a 90-91 crx si.

The final outcome I've decided is

DA front knuckles with calipers
rear 90-91 crx disc brakes
Braided upgraded brake lines all around
DA booster
DA master cylinder 15/16



If I forgot anything plz let me know.

 

That looks good!

You just need to add the e-brake cables and the proportioning valve to your latest list.

 

You're right I did forget those thx a lot @4drEF

 

I'll say this:

FIRST flush your fluid out.

buy some quality pads. Even if you're using parts counter pads buy the higher end ones. I like using ceramics. better bite less fade.

secondly, do just the booster/mc swap. i used to rock my stock front hubs/9" brakes with rear discs and my braking was amazing. really responsive, car stopped quickly

as far as boosters go, you can use the ex 9" booster from a 90-95 civic ex and matching master cylinder and it will bolt up. the 3rd gen preludes (late 80's early 90's) used a 15/16ths mc that bolts up to the civic booster but one line needs to be re bent slightly

the DA booster and mc will bolt up, but you have to get both because the bolt patter on the master cylinder is opposite of the civic.

swapping knuckles will require you to swap axles as well, since the std and hf outer hubs use a smaller axle spline. dx/ex/si axles will pop right in and bolt right up to ex/dx/si/DA knuckles

 

Yea I figure id put the DA Knuckles after the swap of course. I just wanted to see how shell run with the DA booster, 40/40 proportioning valve, DA MC and the braided lines. Hopefully since the DA booster is bigger, I hope there's no idle problems with the car.

 

Dc2 Booster and Master cylinder had that on my ef had to bend brake line to work

 

bolts right up no issues i've ever seen or heard of

 

Yes, that setup would improve braking performance.
Before you even do this, in-order to avoid wasted time and money, you need to ask yourself "What will I be doing with my car?"

Secondly, these topics have been covered MANY times. Use the SEARCH function. GOOGLE is also your friend.

See this thread for a comparison of the Pros and Cons of Disc vs. Drum brakes.:
http://crxcommunity.com/viewtopic.php?f=4&t=85857

To convert to rear disc, you can do a number of things:
-swap the entire rear trailing arm assembly to any 88-01 Civic/Integra trailing arm that has rear disc brakes.
-Keep your current trailing arms. Remove the torx bolts on your trailing arms and remove the drum assembly. Obtain a disc hub assembly and install the disc hub assembly onto your trailing arms. Note: These bolts are difficult to remove and I cannot find torque specs for these bolts.
-Keep your current trailing arms. Buy "scarebird" adapters. Buy rear calipers. Bolt everything up and you're done. This way does not let you use such items as the dust guards.

In both cases, you will need CRX Si parking brake cables.

Proportioning valve:
Ideally, You want to match the proportioning valve to the setup you have. So if you have a DX and convert to rear disc, you'd want to use a 90-91 CRX Si proportioning valve.

If you plan to convert your front brakes to 10.3" (or larger), you can plan ahead and install a 4040 proportioning valve from a 90-93 Integra.

Master Cylinder:
Ideally, You want to match the master cylinder to the setup you have.
The 90-91 Civic EX 15/16" master cylinder is a direct bolt-on with no modification necessary.
The 90-91 Prelude 15/16" master cylinder is also a direct bolt-on with no modification necessary.
Integra master cylinders WILL NOT be a direct bolt on. You will need a booster with the correct bolt pattern as the master cylinder. OR you can get creative and make an adapter plate.

Knuckles:
DA Knuckles WILL bolt on fine. However, they WILL cause a slight change in the suspension geometry. Personally, I would stick with your current knuckles. There are upgrades for them.

 

Wow thanks for the info, all of you guys have answered all I my questions. Ideally I'd like to make a track car and use it for auto cross, this was why I actually wanted to upgrade the braking system in the first place. I've done trailing arms before but never had a chance to really get in depth to the brake master and booster, along with the proportioning valve.

 

Cars getting a new dash anyway has a massive hole over the glove box, plus the booster and Master are shot. So I figured why not.