The Spitfire brake valve you speak of is the PDWA. That is, Pressure
Differential Warning Actuator. I believe the O-rings are the round type,
just flattened off over the years of constant compression. If the
obvious mail-order sources don't list a PDWA rebuild/reseal kit, do take
the piston out and go to your local auto parts supplier and see if they
have anything of the correct size.
The seals you buy locally should have a higher chemical
resistance than the originals.
Have fun.
Greg
Greg Meboe meboe@wsunix.wsu.edu
Dept. of Mechanical and Materials Engineering
Washington State University, Pullman, Wa.
'85 XJ-12 H.E. (daily) '67 Spit-6 '74 TR-6
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