Would anyone know if a rebuild kit is available for the original cast iron proportioning valve for a 71 GS with power disc brakes? All of the repalcements are brass, and since I am going the original route, I would like to re-use the original cast iron unit. I know that this is the chassis resto area and not the brake section of the forum page, but I thought if I asked here, someone who has done a frame-off in the past might have had experience rebuilding a proportioning valve. Thanks, Ken
There is not much to rebuild inside. If your valve is working now, just flush it with alcohol or mineral spirits....then use compressed air to blow out any remaining cleaning solvent.
Get your hands on a recent issue of Hemmings Motor News and check out the "Services Offered" section....there are lots of rebuilders in there and I suspect someone does this. However, like George said..unless it came off a car that had the system open and sitting you might try cleaning it out as he mentioned.
There's a company called White Post Restorations that rebuilds them. I think they advertise in Hemmings and maybe Cars & Parts magazine.
I have read these original types used on 71's are not rebuildable? If you find someone who does it let us know as I am in same boat. Mine works but for how long? I hate those ugly looking brass ones also.
Sorry George, but I have to nix the idea of using mineral spirits unless you follow up with a denatured alcohol afterwards...even then it's no good for any rubber components and can lead to premature seal failures. Keep any petroleum products as far away as possible from the brake system plumbing. If you do wash with a petroleum-based solvent, the alcohol can help to remove the trace contamination without leaving residues. Devon (fuel & brake systems engineer, for what it's worth)
