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<x-charset iso-8859-1>On Monday 12 November 2001 20:28, Jim Adney wrote: > On 12 Nov 2001, at 21:29, Dave Hall wrote: > > The residual pressure valve, I understand from the technical manual, > > reduces the lost motion on braking by maintaining the shoes closer to the > > drums. I'll try to check the manual when I get a moment. > > That pretty much reflects what I have seen written, too, but it > doesn't jibe well with the fact that we expect the return springs to > push the pistons all the way back into the cylinders each time. > > > I don't think the old Beetle had anything fancy like that, and it stopped > > pretty well anyway - maybe it's VWs obsession for complicating things! > > I've got some that were separate parts that I took off an old MC > from something, I think it may have actually been a beetle, > because I don't remember ever seeing them on type 3s. These > were the kind that screw into the MC outlet ports. > > I have a Chevy manual that talks about them for 60s Chevys, too, > so its not just a VW thing. I once rebuilt the MC for a 50 Chevy and > it had one (the type buried at the bottom of the MC bore.) > > I really think they were just something that no one dared leave off > because tradition demanded that they be there. I wonder if we can > give credit to VW for being first to omit them. I have a manual that > talks about the drilling in the outlet port being smaller in disk brake > cars. The smaller port won't make any difference at all, but there it > is. > > They point out that you MUST NOT use the MCs with the residual > pressure valves on cars with disk brakes. At least this much > makes sense. > > IIRC, these valves were a 1967 T-1 only, and did not stay on the cars very long. We had a lot of problems with them causing problems in extremely cold weather. I don't remember ever seeing them on a T-3. They were kind of like the '68-69 T-3 master cylinders. Oddball, and got replaced on most cars. -- Russ Wolfe '71 Fastback AT '66 Fastback MT (IT RUNS) russw@classicvw.org http://www.classicvw.org ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe </x-charset>