I have a 92EG with front and rear 94Integra GSR disc brake conversion with 90-93 Acura integra RS non-abs brake booster/mastercylinder along with the 4040 proportioning valve. I have been running this setup for two years with no problem. So..one day I remembered I slammed on the brakes pretty hard. My brakes still worked as normal but, then another day when I was checking under the hood and I noticed that I was leaking brake fluid from the proportioning valve. Looks like there is a slight leak from this valve that is plugged with a black rubber.

I took off that rubber with a screw off of my old proportional valve to see if the plug came out. So it came out and theres a bigger hole at the outer end and a smaller hole inside. It is un-threaded about 3mm on smaller end and 7mm on the outer end.

Anyways it is really a pain in the *** to take off all the brake lines just to change the proportioning valve so I thought maybe if i can seal that hole up. What is the purpose of this valve/hole? I believe it is a relief/bleed off valve in case the brake pedal gets applied too hard; to protect the master cylinder or other caliper pistons from damage. I think it would be find without this relief/bleed off valve therefore I want to get it sealed up.

Any ideas to seal up this hole? I have come to these options...

#1 Leave the rubber peice in and JB weld, along with a peice of metal/ aluminum?

#2 Rethread hole to about 8mm-11mm so I can insert a flanged bolt in with a rubber washer for seal. Should I rethread it half way till it meets the smaller end, or re-thread it all the way through?

#3 Get it welded up

What do you guys think? If I get this hole welded up do I still have to remove the proportioning valve?

 

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