rear disk break conversion

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Old Oct 15, 2008 | 09:37 PM
  #1  
classdork987654's Avatar
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Default rear disk break conversion

so i have everything i need i believe. except for some people were saying you needed a porportioning valve off the teg to? is that true
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Old Oct 16, 2008 | 01:50 AM
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Default Re: rear disk break conversion (classdork987654)

Yes you will need a 40/40 prop vavle (non abs if you dont have it) so that the brake fluid/pressure is evenly distributed throughout the whole system so all 4 brakes are getting the same pressure/fuild if i am not mistaken. Some people also say you will need the master cylinder too but mine is just fine without it.
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Old Oct 16, 2008 | 03:58 AM
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Default Re: rear disk break conversion (88 civic ef)

actually it is just 4040 not 40/40 FYI
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Old Oct 16, 2008 | 06:22 AM
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All cars are biased up front in braking power b/c that is where 80%+ of all braking occurs especially on FWD road cars (full out race cars allow you to adjust based on performance - and 50/50 balanced or rear engined cars such as with Porsches can use more rear brakes than most cars.). The Integra's 4040 valve increases the rear brake pressure b/c rear calipers take more fluid to push to be as effective as the drums. You will never have 50 front / 50 rear braking on a Civic as rear brakes on these are used very little especially under hard braking. Most racers keep drums in the rear for weight savings and they work just fine. The nice thing about doing rear disc swap is adding the RTAs with the end link mounting holes for a rear sway bar.
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Old Oct 16, 2008 | 06:30 AM
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Default Re: (jaje)

Took a 30/30 valve off of a 95 teg with rear disk brakes from a junkyard. Would that work on a rear disk brake conv on a EF.
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Old Oct 16, 2008 | 06:43 AM
  #6  
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Default Re: (aztecracer1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aztecracer1 &raquo;</TD></TR><TR><TD CLASS="quote">Took a 30/30 valve off of a 95 teg with rear disk brakes from a junkyard. Would that work on a rear disk brake conv on a EF.</TD></TR></TABLE>

Yea but not well, thats an abs system more then likely.
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Old Oct 16, 2008 | 08:16 AM
  #7  
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Default Re: (ComeOnKip)

No it was off of a non abs vehicle.
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Old Oct 16, 2008 | 08:51 AM
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Default Re: (aztecracer1)

Why bother with trying the 3030 valve when people are telling you to use the 4040 valve? I used the 4040 valve and my brakes are great. Get your hands on a 4040 valve. Do it right, do it once.
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Old Oct 16, 2008 | 08:58 AM
  #9  
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where is this valve located so i can grab it
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Old Oct 16, 2008 | 11:09 AM
  #10  
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Default Re: (civicmulisha)

All that i'm saying that why would a teg with four wheel disc use a 30/30.
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Old Oct 16, 2008 | 10:45 PM
  #11  
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Default Re: (jaje)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jaje &raquo;</TD></TR><TR><TD CLASS="quote">Most racers keep drums in the rear for weight savings and they work just fine. The nice thing about doing rear disc swap is adding the RTAs with the end link mounting holes for a rear sway bar</TD></TR></TABLE>

I've heard that the rear drums on the crx had a shorter braking distance as compared to the rear disc setup, but never heard of them being lighter, i would figure that the disc setup would be lighter, any info or link to back this up? not that i don't believe you, i just like to read into things.

i want a rear sway bar, but is it not possible to install a rear sway bar on a drum trailing arm?

i have the complete 91' si rear disc brake swap, but after hearing that it has a longer braking distance, and now hearing that they are heavier? im thinking about changing my mind on the swap and keeping my drums, if i can install a rear sway bar.
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Old Oct 17, 2008 | 08:00 AM
  #12  
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Default Re: rear disk break conversion (classdork987654)

You need a 2040 CRX Si proportioning valve if you are keeping the stock front calipers. You need the 4040 valve if you are upgrading the front calipers (like EX or DA).
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Old Oct 17, 2008 | 08:29 AM
  #13  
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Default Re: rear disk break conversion (vanrij)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vanrij &raquo;</TD></TR><TR><TD CLASS="quote">You need a 2040 CRX Si proportioning valve if you are keeping the stock front calipers. You need the 4040 valve if you are upgrading the front calipers (like EX or DA).</TD></TR></TABLE>

I kept my front DX brakes and am running the 4040 valve. Works great.
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Old Oct 17, 2008 | 09:07 AM
  #14  
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Default Re: rear disk break conversion (Ermil)

It will work, and the difference is not much, but for the correct fluid proportioning on an EF with rear discs the 2040 is what was engineered by Honda. Using a 4040 with stock front calipers and stock master cylinder will result in slightly too much fluid being sent to the rear calipers.
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Old Oct 17, 2008 | 05:10 PM
  #15  
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Default Re: rear disk break conversion (vanrij)

So with stock disks up front and say EG rear disks(on an ef) get the valve from the EG, ok so whats the valve on the EG? 3030? 2030? 3020?
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Old Oct 17, 2008 | 05:35 PM
  #16  
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Default Re: rear disk break conversion (Sidneyious)

Stock brakes up front, stock master, cylinder and EG disc brakes on the back of an EF you still want the 2040 prop valve.
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Old Oct 17, 2008 | 11:12 PM
  #17  
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Default Re: rear disk break conversion (vanrij)

The choice to convert your brakes from drum to disc should be your own choosing; whether you want to race the car or drive from point A to point B for commuting. I am currently swapping over from drum to disc because I want to have ease of inspection and maintenance. I know that it adds weight to the car, around 16 lbs.; that's not a lot in my book to offset my choice. Talk to some experienced mechanics or engineers that can give you stopping distance data.

The brake proporational valve is located in the engine compartment on the right front wheel well area (crx). Which valve type to use ? I have been informed to use a 4040 valve just to ensure that the pressure is correct to the brakes. Your stock master cylinder is adequate for the job unless you just want to upgrade to a new unit.

Looking under the rearend of the crx I never have seen a sway bar mounted up to the rear trailing arm. I have seen it bolted up to the lower control arm the chassis then bolted up to the RTA. Both the integra and crx chassis have been built on the civic chassis, so I have not seen a problem concerning the sway bar installation for both.

Let the opinions fly.


Modified by Icaras at 12:28 AM 10/18/2008


Modified by Icaras at 12:34 AM 10/18/2008
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Old Oct 18, 2008 | 04:25 AM
  #18  
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Default Re: rear disk break conversion (Icaras)

i kept my stock prop valve as its my daily.

just make sure to use the ef toe arms and not the integra ones, or it cant be aligned


i also have a 40/40 prop valve if anyone wants to buy it 35 shipped?? is that a good price
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