Richard Holder wrote:
>
>
>
>Sorry to say this, but you won't have working brakes for more than a year or
>two - or possibly less.
>
>The standard seals in the Jamar twin master cylinder are designed for the
>use of automotive brake fluid Dot 3, 4 or 5.1. If you use ATF (or the
>mil-spec aviation brake fluid) the seals will deteriorate.
>
>The bad news is that the standard seals in the callipers are designed for
>ATF (or mil-spec aviation fluid) and if you use DOT 3, 4 or 5.1 THEY will
>deteriorate.
>
>This is why the factory specifies DOT 5 - silicone brake fluid which will
>not affect either types of seal.
>
>I have decided to go Automotive - thanks to the help of Ivor Phillips of
>this List. I had already messed up (testing) my master cylinder seals with
>ATF so he provided me with new seals for the master cylinder, the callipers
>and the Matco parking brake valve all to work with Automotive brake fluid -
>I will be using DOT 5.1
>
>I admit that at the moment I am using two of the floor based master
>cylinders, with the changed seals for tri-gear use, as finger style brakes.
>I am used to them, but no way can they be described as easy ! And in fact my
>co-builder filled the systems up with Automotive fluid so I expect part of
>the sluggishness is due to swelled seals. I will be putting in the Jamar
>dual master cylinder at the time of the annual in March. I am researching
>and getting everything together, ready !
>
>I will increase the power of the internal spring a little by putting in a
>flattened spring washer (maybe 1.5 mm thick) into each bore before the
>spring ( which is followed by the piston ... Etc. I will be sure that the
>spring washer is nice and clean !
>
>Richard
>
>
>
>
Richard,
Do you have specifications for the seals that you used? Or better yet,
manufacturer and part numbers? Thanks,
--
Jeff - A055
Builders Log: http://www.N55XS.com
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