past few days have been after D front wheel cylinders / brakes . Today, we
solicit any comments / knowledge , or share same !
So, after a small leak
with silicone fluid ,the left front of car grabbed badly . i do not think you
can really get any brake fluid out of linings no matter what you try , with
silicone being probably 20x worse . so new shoes have to go in . however the two
old shoes were made differently from each other , although both had the only one
“ set” of V ‘s as is correct in early 58 ,57 . = mix of brands? Single pair of V
‘s in each shoe are different heights . more on this in a moment .
although
we could find no obvious reason for small leak by piston , some obvious
significant crud was piled in top cylinder right behind the inward ( new) piston
travel , despite being thoroughly cleaned ( stuff at assembly was spotless)and
new piston put in recently with almost no miles . This Crud may have gotten
under piston lip ? so bleeding brakes may move significant long term crud on our
now old cars from lines to wheel cylinder ! heads up .
That says bleed all
lines aggressively into a cup before attaching new wheel cylinders? did not know
— or do that ...
so , Ed , who has worked with me for many years , got a new
piston , and honed brake cylinder “ just in case a scratch “ I get this , but
question came up in my mind what is spec of final wall finish ? common KD brake
hone. .. on line , there are talks of “cross hatch “ ( =mouth wag , taken from
engine cylinder?) . .. to me as engineer for a seal you want a mirror finish ?
like on construction equipment rod, not a hone finish ? although maybe hone is
ok . ( not sure about that .. would expect seepage due to microscopic rough
surface ?) .
so out of caution and indecision decided to just replace
cylinder , but this question remains ?? and many “rebuild job” honed cylinders
do seep a bit . anyone know factually about finish ?
another seep is another
set of shoes ... and all this work . and breaking in shoes.
says to me very
light pass with hone or just leave it alone if clean after bench cleanup .
now , —“new “ shoes seemed to have both sets of V,s .
confused me as
that is for “three platform brakes (?)” , and the third point they count is
apparently the two plates in the middle of shoe web that are part of cam
adjuster etc —-with the 4 large bolts . no info on new shoes — riveted rebuild
no box. on shelf for years. probably for an F .
Trying these, on D , the
extra V’s do not hit anything , ( no matching platform on backing plate ) so
maybe later shoes ( 59 up) fit the earlier cars , or some would. After careful
examination , I can see no issues .
so ? some questions:
1) of correct
wheel cylinder finish , ? 2) later shoe retro retrofit ,? 3) bleeding st high
flow may flush harmful junk into upper wheel cylinder , —- and not out the drain
.. never thought of that .
there are solvents for silicone oil , Dow ,
but could not find retail sale of it .Think it is DS 2025 .. another subject .
all FYI !
john grady
Sent from my iPhone not by choice
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