Proportioning Valve cleaning, operation, storage..
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Tuned
Joined: Sep 2004
Posts: 305
Likes: 1
From: Fuquay Varina, NC
Proportioning Valve cleaning, operation, storage..
Have done the conversion on my '66 F100 to PDB, but I'm still a little worried about the '73 proportioning valve that came off the donor truck. Had been sitting quite a while and pretty nasty looking, but I cleaned it up and used it. It's not clear to me what the purpose is of the small pin that sticks out of the front of the unit is for (pressure release/reset)? Mine is frozen solid - that said, I was able to bleed all the brakes (rear drum, front discs) seemingly just fine (still a ways to go before I can road test). As a secondary note, I have done many a pedal bleeds and the fluid is clear at all 4 brakes (also installed new brake lines everywhere), but I still see some dark flakes in the cup?
As a precaution, I picked up a used one today as a back up. It seems to be in much better shape than my current one (new one came off of a '76 F150) and the pin moves a little by hand in and out. My question is what is the proper way to internally clean and store this unit? Leave it alone/don't touch it until I need it someday? Or should I run break clean spray thru it and then store? Or after the brake cleaner spraying then also spray some WD40 or PB Blaster inside it and then put it on the shelf??
Thanks,
daggerNC
As a precaution, I picked up a used one today as a back up. It seems to be in much better shape than my current one (new one came off of a '76 F150) and the pin moves a little by hand in and out. My question is what is the proper way to internally clean and store this unit? Leave it alone/don't touch it until I need it someday? Or should I run break clean spray thru it and then store? Or after the brake cleaner spraying then also spray some WD40 or PB Blaster inside it and then put it on the shelf??
Thanks,
daggerNC
Junior User
Joined: Jan 2007
Posts: 52
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I took mine apart and cleaned it up with some superfine wet/dry sandpaper. Do not mess with the o-rings at all since they are special for brake applications and you can't replace them with regular rubber o-rings. If you ever plan on using it again I would not use oil based lubes on it or you'll have to tear it apart and clean it again before use. Mine works well now and it felt siezed before I tore it down and cleaned it.
