I have a 1968 Spitfire Mark III that I'm restoring. It has a proportioning
valve in the brake lines just downstream of the master cylinder. The little
shuttle that lives inside has two square section 'O'rings that are gonzo on my
unit. I'vs seen replacements for the entire unit ($$$$$) but was wondering if
anyone knew of another source or has specs on the o-rings themselves. Also, I
saw a 1981 (japanese) Ford pick-up the other day that had what looked to be
the identical proportioning valve in it (who said the Japs never copied a good
thing?). Who out there is technically obtuse enough to have a go at this one.
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