I have just had my 2nd 40/40 proportioning valve fail and leak fluid. I believe it is because I am changing the bracket from the Integra to the CRX so it will mount to the car. To change the bracket you must remove the two bolts that hold the unit together. I have tried to use a hex head bolt instead of the security head bolt so that I can torque the bolts down more witch did work for just a little bit. Every thing on the braking system is new BUT the proportioning valve. I don't like the idea of buying another used part that will more then likely leak again. I have seen some new accord valves that look like it would be a direct fit but unsure if the proportioning will work for my set up. I am not against going with an after market proportioning valve but have never done a custom job like that however not afraid to do it. What I need to know is: Are their any other stock proportioning valves that will work that I can buy NEW? If not what company/kind of after market proportioning valve can I use and is there a good write up on how to do it? Thanks for the help and here is my current set up

Front
-1991-CRX Si front stainless steel brake lines
-1990-1993 Integra 4040 proportioning vale
-1990-1991 Civic DX 15/16" bore master cylinder
-1990-1991 Civic DX 13/16" brake booster
-1996+ Integra type R calipers and brackets
-2004-TSX pads
-2007-Mini Cooper-NON-S rotors 280mm

Rear
-1991 CR-X Si rear stainless steel brake lines
-2002 EP3 Si rear calipers, pads, and rotors

Dot 4 brake fluid

 

where is it leaking?

the rubber stopper or just the oring between the two halves?

 

I believe it is leaking at the halves. I don't know where the rubber stopper is to check it.

 

theres just an o ring between the halves. you didnt replace that? thats whats really sealing it. pretty trivial to replace and fix.

the rubber stopper is on the top half, facing outward. its kinda small. its the more common leak point.

 

For the heck of it let's say both because I know it was leaking from the rubber stopper on my other one and I believe from the o-ring as well but wasnt bolted together as tight as this one. What size o-ring do I need to get or does Honda sell it? If so do you know the part number or what I should ask for? If it is the rubber stopper can that be replaced/fixed? If that doesn't work what are some alternatives for stock valves or a good aftermarket one?

 

no, honda doesnt sell the o ring, its not meant to be servicable, or opened.

the rubber plug is not replaceable either.

 

You'll need to measure the diameter and thickness and order one, or if you have a hardware store around you (like Ace Hardware) you can take the old o-ring and find one there that matches.

(Edit: Hardware store is unlikely to have the right oring, see Tyson's note below)

What is the rubber stopper for?

 

unfortunately you really need to be careful with the material selection of the oring when working with brake fluid.

https://www.martins-rubber.co.uk/blo...lection-guide/

i really dont know exactly what the rubber plug is for, or its been a while since i looked at one separated. i figure its some port to access an internal machining feature. the bottom side with the same casting doesnt have it.

 

Thats a great point, I'll edit my response out to avoid confusion.

 

Thanks for the link I will give them a call to see if they could help me get the right one. I will try replacing the o-ring and see if that does the trick but wont hold my breath because it could still be the rubber plug. Any other options that you might know of for the proportioning vavle? Like an accord or del sol?

 

would any of these proportioning valves work?


https://www.ebay.com/itm/20327581732...09800kz8700004

https://www.partsgeek.com/gbproducts...10080302008005

https://www.partsgeek.com/gbproducts...10080302008005

these are some aftermarket options


https://www.chasebays.com/collections/honda

 

I found that the fluid is leaking from the rubber stopper I need another brake proportioning valve. I can not find a new 40/40 valve. I am trying to find something new that's close to a 40/40 or the next best thing. Reading that you can use prop valves meant for drums that the difference is very little between the valves. These are the valves I have found new witch one would be closet to 40/40 and best for circuit racing trying to avoid rear lock up. If you know of a site or other valves I could get new please let me know.

Accord:
46210-SM4-A05
46210-SV4-A01

Civic:
46210-SR3-013

 

see, i know what im talking about...

can you please stop calling it a 40/40 valve? its 4040. there is no forward slash.


3030, 1725, 2040, 3540 all exist and its not just a ratio.
what DOES it mean? i dont know exactly. but i'm sure theres a set force where the ratio changes and that is dependent NOT just on if you have rear discs, but also vehicle weight, weight balance, wheel base, etc....

dont understand what i mean? flying miata has absolutely the best explanation. watch the video here:

You Tube

or read the article here: https://www.flyinmiata.com/NB/tech/suspension/stock_bpv

i know youre looking for an UNUSED prop valve that "works". what does "work" mean to you?

something that drops right in? only a prop valve from an EF has the right bracket, but others fit like the DA if youre willing to risk switching brackets and separating the halves (never leaked on me before), or just mounting the prop valve by just one hole instead of two.

something that wont lock your rears too quickly? well thats trickier. some even go on record they've never swapped the prop valve after messing with brakes and it "worked" for them. great. maybe theyre not really pushing their car on a track, or trail braking or had an emergency hard brake situation. im sure it "works" until it doesnt.

so then which prop valve do you NEED? i honestly dont know. youve completely butchered and customized your brakes. who knows. but a 4040 has worked for a lot of ppl going big brakes, without complaints, also. will that accord or civic freshly purchased prop valve "work"? i honestly couldnt say. the only advice i have for you is to compare your system to OTHER model cars and pick the prop valve that matches what HONDA generally specified for that vehicle, they must have done it for a reason. for most people, its the 4040.

 

This braking system mimics a 98 itr brake system with out converting to 5 lug its the same size rotors. Other ppl have done this and it worked for them but I seem to be a little unlucky lol. I don't mind just using one bolt to hold the valve to the car also I have a hex head bolt and lock nut to replace the security head bolt so I can trq it done more and that work it is not leaking from the halves from what I can tell. That chart does help thank you I look at it more in depth to find a answer for you.

 

Of the cars listed on the chart of course the integra is the closest. If I could only find a 4040 new that would be great or some how stop the leak from the rubber stopper. I will try and find out what the different valves that u said are for maybe that will help guide me and will let you know what I find.. From the research I have done thus far the 4040 hase the most rear pressure so it would be safe to say that the other valves would not lock up my rear brakes. I saw some accords have close to my set just try to figure out what valve is used for the rear disc set up. Any body have any experience with going aftermarket like chase brakes?

 

What are chase brakes? Is it that wire tuck crap? I wouldn’t put that scaled down stuff in a track car.
The 4040 prop valves come out of mainly integras. There are other threads on this forum try a google or duck duck go search using honda-teach in the search string.
Finding new parts for our cars is getting harder if not impossible to find these days. Your best source is the wrecking yard now a days.
Not saying there are no new parts, sometimes one gets lucky with a lot of searching. The more and more I check for parts for my 92 EG hatch the more I need to include the wrecking yard in my search.
In my EG I do have the (faux) ITR set up…. Mini rotors Legend calipers etc. My 4040 came out of a GSR.
Good luck.

 

DA Integra. Stop trying to swap the bracket.

 

I have been trying to do my research on these vales but finding different info on different sites. Does any one know the proportioning on the listed parts. I Could be wrong on what I believe the proportioning is that's why I am asking. Also read that one of many things that could change how the pedal feels could be the PV ie make it stiffer or softer. If that's true would a 3030 be stiffer then a 4040? Dirty19 do you like your brake set up?

Accord:
92-93 EX-DX-LX
46210-SM4-A05 3030?

94-97 SE-DX-LX
46210-SV4-A01 4040? or 3030?

Civic:
92-95 EX-DX-LX
46210-SR3-013 3030?

 

not marked in pics.





3040
https://www.ebay.com/itm/15382457855...kaAhwDEALw_wcB


https://www.ebay.com/itm/12401466307...8aAnlSEALw_wcB

3030 stamping looks clear to me.

sorry, links and notes fixed.

 

3040 so if I am not mistaken that means it sends more rear brake pressure then the 3030 before it equalizes brake pressure at all four corners but not as much as the 4040 correct? Or does it send more rear pressure then the 4040?

46210-SM4-A05 is a 3030?

Tyson thank you for your help I really appreciate it!

 

honestly i dont know. it doesnt make sense to me.

for years i felt like taking some pin gauge measurements and test the strenght of the springs to reverse engineer and maybe get a sense of what the numbers mean. its somewhere on the list....

i corrected the comments above. this board does weird things in the background when you introduce links.

 

Well lets be more confused together lol

https://www.ebay.com/itm/29280679150...UaAig-EALw_wcB

https://www.ebay.com/itm/25501175475...Cclp%3A2563228

Both those links show the 94-97 accord is a 2025?!?! The link you sent is a used part refurbished and clams 94-97 accord as well and shows a 3040?!?! So I truly don't know at this point. I will continue to do research. I finally have some free time during the day tomorrow to go over to a Honda dealership and ask a few questions.

Also found these sites that seemed to be very detailed and will do research on them and might call them as well. Will post my results. And as always any info is welcomed.

https://parts.jimwhitehonda.com/sear...alve&ptid=1888

https://www.hondafactoryparts.com/oe...waAgVQEALw_wcB