I am converting my disk/drum setup to 4-wheel disk. I have done most of the research and calculations to make sure that I don't screw up my brake bias with the swap, but I still feel that I need a new propotioning valve to make sure all is tuned right.

I cannot find a 4-port 10mm 1.0 bubble flare proportioning valve. This is the size Honda uses, so what parts do you guys source when doing disk swaps?

 

4040 prop valve from a 94-95 Integra RS

 

Thank you. What is the difference between a 40/40 valve and a 40/35 valve?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beepy &raquo;</TD></TR><TR><TD CLASS="quote">Thank you. What is the difference between a 40/40 valve and a 40/35 valve?</TD></TR></TABLE>

5

seriously, nobody really knows what those numbers mean. They're just a way of IDing what prop valve is what. What year and model is the Civic BTW?

 

the also come on 96-00 civic hatch

 

Yeah, I was looking on Ebay and I saw nothing but 4035 valves. They look like they will fit but I wanted to make sure they didn't have a different bias.

Work is being done on a 2003 turbo Kia Rio.
Wilwood 11" front rotors with 4-1" piston calipers and Civic hats (require spacers that I am also trying to source)
Mazda Miata 9.8" rear rotors and calipers with built-in parking brakes. Basically bolt-in once I machine my stock drums down to the hub and make caliper brackets. Still trying to find a parking brake cable that is long enough, also. For some reason the Rio uses 65" cables whereas most Mazdas with rear disks use cables in the range of 40-55".

The bias should be good based solely on the master cylinder / piston dimensions, but need a disk brake proportioning valve so that the rear brakes come in at the right time. The OEM Kia proportioning valve is actually adjustable... But I doubt the Kia engineers put enough adjustability in to work with a rear disk swap.