mrbigg9032

Ok I have a 98 honda civic ex with ABS & rear drums. I want to swap to rear disc & keep ABS. I already bought a rear disc swap from a 99 Acura GSR with ABS sensors.
1) Now my questions are can I use a 99-00 Si porportioning valve (non ABS) with this swap or does it have to be a valve from a gsr?
2) Will the stock ABS computer work even though it is now rear disc?
3) Are the drum brake ABS sensors the same as the disc ABS sensors?

Please dont give me answers like just take out ABS because thats not what I want to do.

reaction360

1. You do not need to change your proportioning valve as 96+ civics all came with the same valve as the SI model with 4wheel disc.

2. The computer shouldn't have an issue as it just needs to read the tone ring on the hub. which the gsr will have.

3. I don't know if the sensors are different or not, but they maybe bolt up differently due to the difference in the drum/disc spindles.

mrbigg9032

Tanks for the info anyone else, maybe someone with first hand experience

mrbigg9032

I'm still confused about which porp valve I can use. SHould I usa a abs gsr or a 99-00 si (which I have already.

hatchling37

The prop valve on your car is identical to the one that came in the 99-00 Si. If it's in there already, and you have ABS, I would just leave it.

mrbigg9032

Their not identical the part #'s from honda are not them same.
Anyone else with info that can help..

mrbigg9032

Any brake experts?? (hint hint)

hatchling37

Why don't you just PM him?

SoCal EJ1

non abs and abs prop valves are different.

mrbigg9032

I was figuring they were diffrent.
There is just a lot of "what ifs" about this swap that i don't have answers too.

mrbigg9032

Anyone else?

mrbigg9032

Stil confused which valve to use!! Anyone else!

ohsnapzafingcu

iTrader: (2)

prop valves for rear disks and rear drums are different.. drum brakes always have pressure applied, and disks aren't the same (or vice verca)

ohsnapzafingcu

iTrader: (2)

the prop valves shouldn't (a/e)ffect the ABS.. there are rings on your axles that tell the abs computer if your wheels are locked up..

mrbigg9032

Good point, I think my best bet is to use a 99-00 si porp valve.

ohsnapzafingcu

iTrader: (2)

i edited the 2nd to last post i did.. but yeah prop valves for drums, and disks are totally different

mrbigg9032

Ya thats why I think using a 99-00 valve will be my best bet.

burningrex

use the 99-00si prop valve!

Katman

I'm personally not sure if the Si and Non-Si prop valves are both 40/40, but regardless of that, the Si and Non-Si prop valve part numbers are going to be different because they're from different model civics.

kommon_sense

He has an ex which is the *ONE* 96-00 civic which had a different prop valve. The dx/lx/si/etc. all used the same valve, but the ex was the exception.

Katman

oo noted! thanks Kommon

by being the exception, it's not a 40/40 prop valve but something less?

kommon_sense

I'm not sure what the proportion is. I just recall it having a different part number. I went through all of this when I did the rear disc conversion on my 98ex.

The ex kind of had the oddball brake setup out of the bunch with the big front discs and standard rear drums.