Honda Civic Performance - JDM Discussion Engine tech, forced induction, springs, shocks, brakes, tires, etc.

Rear disc conversion

Old 06-May-2005, 11:01 PM
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Rear disc conversion

I know this question been posted 100000000 times but...I can't find those posts. Anywayz, I am rebuilding my rear drum brakes and they pissed me off so badly, if rear disc conv is not too much of a job plus I do lots of track lapping I will do it. I am running 13 inch rims all around and I was wandering if a 13 inch rim will fit on integra rear discs, or Si discs. What options do I have beside EG si and 94-00 integra? I understand I will need the following
- EG si or Integra rear trailing arm assemblies
- Brake lines for the caliper
- Bigger MC and booster
- Prop valve(what is this?)
- ??

Thanks
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Old 08-May-2005, 01:53 PM
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Yes 13" rims will fit over ANY rear disc conersion. (they all use the same size rotors and pads; well 4-bolt that is; not ITR 5-bolt )

ok sooooo on an EH2? let's see...

Any 94-01 Integra (preferable newest) will work; as well as EG Si; but with an EG Si, they will have HIGH milage, soo caliper maybe serized, pads/rotors worn, trailing arm bushings cracked etc etc etc same goes for an older Integra setup;

So try to find like a 98+ setup w/low milage; You'll need the complete trailing arms, w/e-brake cables, and the flex lines (the rubber hoses that connect to your hard lines on the car; they're different form drum setups)

Prop valve? YEP! You need a 4040 of an EH2 (EG si) or an OLDER 94-95 Integra (newones are different) Basicly it balances pressure the brake fluid going to the front calipers vs. the rear brakes; and they are different from rear disc vs. rear drums.

MC? not needed but a good idea; (my EG Si came w/smaller 13/16th MC+BB which all base civics some with)

But switching to a 1.0" Integra MC and BB make a HUGE difference!!

check out these links; (good reading

5th gen rear disc swap;

http://hybrid2.honda-perf.org/tech/brakeswap.html

5th gen MC and prop. vale swap

http://hybrid2.honda-perf.org/tech/brake2.html

good luck!
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Old 08-May-2005, 03:09 PM
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a prop valve distributes line pressure from the master cylinder to each individual cylinder at the wheel (caliper). On hondas it's a diagonal system, where LF and RR would have a common source, and RF and LR would have a common source (but diff't pressure). anyways, since calipers require diff't volume and pressure amounts, you have the change the prop valve to one designed for rear disks. This ensures proper brake bias.

oh and you need emergency brake cables, prolly integra ones.
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Old 08-May-2005, 04:18 PM
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Originally posted by Solid Alibye
Yes 13" rims will fit over ANY rear disc conersion
No they wont! need 14's.
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Old 09-May-2005, 12:12 AM
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Originally posted by Solid Alibye
Yes 13" rims will fit over ANY rear disc conersion. (they all use the same size rotors and pads; well 4-bolt that is; not ITR 5-bolt )

ok sooooo on an EH2? let's see...

Any 94-01 Integra (preferable newest) will work; as well as EG Si; but with an EG Si, they will have HIGH milage, soo caliper maybe serized, pads/rotors worn, trailing arm bushings cracked etc etc etc same goes for an older Integra setup;

So try to find like a 98+ setup w/low milage; You'll need the complete trailing arms, w/e-brake cables, and the flex lines (the rubber hoses that connect to your hard lines on the car; they're different form drum setups)

Prop valve? YEP! You need a 4040 of an EH2 (EG si) or an OLDER 94-95 Integra (newones are different) Basicly it balances pressure the brake fluid going to the front calipers vs. the rear brakes; and they are different from rear disc vs. rear drums.

MC? not needed but a good idea; (my EG Si came w/smaller 13/16th MC+BB which all base civics some with)

But switching to a 1.0" Integra MC and BB make a HUGE difference!!

check out these links; (good reading

5th gen rear disc swap;

http://hybrid2.honda-perf.org/tech/brakeswap.html

5th gen MC and prop. vale swap

http://hybrid2.honda-perf.org/tech/brake2.html

good luck!

Thanks a lot, I will read over them.
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Old 09-May-2005, 12:15 AM
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Originally posted by bbarbulo
a prop valve distributes line pressure from the master cylinder to each individual cylinder at the wheel (caliper). On hondas it's a diagonal system, where LF and RR would have a common source, and RF and LR would have a common source (but diff't pressure). anyways, since calipers require diff't volume and pressure amounts, you have the change the prop valve to one designed for rear disks. This ensures proper brake bias.

oh and you need emergency brake cables, prolly integra ones.
Is the prop valve located in the MC? Thanks
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Old 09-May-2005, 12:16 AM
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Originally posted by My Blue Si


No they wont! need 14's.
Geez their rear brakes are bigger than my front brakes??
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Old 09-May-2005, 12:21 AM
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I still haven't start to do my rear drum, but I guess I will leave it alone and just rebuild it later on. I bought all the parts for 100, drums, wheel cyclinders, hardware kit and shoes. I see lots guys in the states are using drum brakes for road racing, personally I never had a problem with it, only rear disc makes me feel better. I guess I will just save the money for front brakes. I've heard lots guys saying their rear caliper locking up, is it a common problem for you guys who got rear disc?
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Old 09-May-2005, 01:57 AM
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it is not located in the MC. it's on the firewall with either 4 or 6 lines going to it, depending on whether you have ABS or not
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Old 10-May-2005, 07:59 PM
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Originally posted by B16A_2

Geez their rear brakes are bigger than my front brakes??
<LOL>

Like I said before......

13" steelies WILL fit over a GS-R rear disc conversion; considering that the rear rotors are SMALLER then your stock front brakes (9"), AND the calipers are smaller too...

PLUS my '93 Si h/b (OE. rear disc) came with a **13"** spare tire; and there's no way you can convince me that a 13" donught spare is bigger than any normal 13" rim!!

So if you ever do the swap you'll be fine!

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Old 10-May-2005, 08:10 PM
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Originally posted by B16A_2
I still haven't start to do my rear drum, but I guess I will leave it alone and just rebuild it later on. I bought all the parts for 100, drums, wheel cyclinders, hardware kit and shoes. I see lots guys in the states are using drum brakes for road racing, personally I never had a problem with it, only rear disc makes me feel better. I guess I will just save the money for front brakes. I've heard lots guys saying their rear caliper locking up, is it a common problem for you guys who got rear disc?
Well if you adjust the rear dums tightly then you'll be fine. I always adjust them so there's *slight* drag when you put the drum on and you spin them. That way there isn't any excess "gap" between the shoes and the drum surface.

Oh and that'll cause a brape pedal that's firm and nice and high.

Besides, your front brakes do 80% of all your braking anyways.

There's only 2 other suggestion I have for you;

- use a good quality DOT 4 brake fluid (Dot 3 and Dot 4 are interchangable) **DO NOT USE ANYTHING ELSE; ex. DOT 5; it's silicone based and will swell all your seals etc etc etc bad idea) Personally I like Motul 600 (boiling point approx 600F woohoo!)

- BEFORE you change your wheel clyinders, buy the small metal lines that go inbetween the wheel clyinders and the rubber flex lines; (they're like $12 each @ my dealership LIST) because the lines tend to rot and SEIZE into the wheel cylinders and BELIEVE me can cuase majour head aches; get the 2 lines, and you'll be fine. ('specially for what they're worth; they ALWAYS come off @ the flex lines)

Anyways PM me or e-mail me if you need any help

good luck!!
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Old 10-May-2005, 08:17 PM
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Originally posted by bbarbulo
it is not located in the MC. it's on the firewall with either 4 or 6 lines going to it, depending on whether you have ABS or not
Sorry buddy wrong again....

Yes for EK Civic's and 98+ Integra's that's correct.. BUT

For EG's and early 3rd gen Integra's they ALL use 6 line proportioning valves, and the rear drum versions are stamped "3030" on them and rear disc versions are stamped "4040"

The EK/late model Integra are yes like you said 4 or 6 lines (depending on ABS or not) but there ARE NO stampings on them to tell them apart; So even though it's 4 OR 6 lines into the propvlae (on an EK) visually you can't tell a rear disc to drum valve apart;


OH and for the record, I've done 2 EF rear disc conversions, 3 EG rear disc coversions (including 5 bolt) and 2 EK rear disc swap's, so don't think I'm b.s.ing ya!

later
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Old 10-May-2005, 09:10 PM
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Thanks, I actually just adjusted my rear drum with a few friends...yeah when it comes to drum brake I am completely ignorant. Just like you said my pedal feels much firmer than before, surprised what those drums can do to the brake. I used RBF600 for almost two years, I actually just finished my last bottle and being a poor student I can't afford em anymore. I will probably go with Ford heavy duty or ATE supablue. Thanks again for your help.
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Old 10-May-2005, 10:25 PM
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Originally posted by Solid Alibye


Sorry buddy wrong again....

Yes for EK Civic's and 98+ Integra's that's correct
so what am I wrong about then?
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Old 10-May-2005, 11:31 PM
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I mean SPECIFICALLY for rear disc conversion for his EH2 (EG Civic; his application)

(EG's **ALL** use 6 line prop. valves; no 4 line prop. valves)
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Old 10-May-2005, 11:33 PM
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Originally posted by B16A_2
Thanks, I actually just adjusted my rear drum with a few friends...yeah when it comes to drum brake I am completely ignorant. Just like you said my pedal feels much firmer than before, surprised what those drums can do to the brake. I used RBF600 for almost two years, I actually just finished my last bottle and being a poor student I can't afford em anymore. I will probably go with Ford heavy duty or ATE supablue. Thanks again for your help.
SWEET!

Good job man!

Glad I could help!

later!
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