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Bob,
More info;
http://www.gerardsgarage.com/Garage/Tech/DbrakeUg.htm
http://www.brakecylinder.com/spridgetbrakes.htm
On Sun, Jul 26, 2015 at 4:35 PM, Bob Kitterer via Spridgets <
spridgets@autox.team.net> wrote:
> To begin, this entire hydraulic system is from a 1957 Mk IV but installed
> in a Bugeye. The brakes and the clutch are separate systems. Also It ha=
s
> used silicon break fluid since the restoration in 1997. Jump forward to
> 2009, on the way to the gas station suffered a complete loss of brakes. N=
o
> leaks, no loss of fluid. Assumed that the seals in the master cylinder h=
ad
> =E2=80=9Csuddenly=E2=80=9D ceased to seal, may be a bad assumption. Any=
way did a complete
> rebuild of both the brake and clutch master cylinders, wheel and slave
> cylinders and calipers. Afterwards was unable to get any pressure on
> either system. This may have been due to the one person system bleeding
> method which may have introduced air into the system, a problem with
> silicon fluid. The car went into storage so I could do some bucket list
> stuff.
>
> So now I have just finished disassembling the entire hydraulic system.
>
> First all the seals look new, that is setting in silicon brake fluid for
> eight years has not had an adverse effect.
>
> Next there is some wear on the master cylinder pistons, wheel cylinder
> pistons and slave cylinder piston. This wear seems to be just enough to
> remove the black finish on those parts. I measure less than 0.001=E2=80=
=9D wear.
> So would assume that they are still serviceable.
>
> There is some corrosion, particularly in the rear cylinders, which needs
> to be honed out.
>
> Besides any questions, comments on the above, does anyone know what the
> maximum service diameters are for the various cylinders?
>
> Brake Master Cylinder Bore =3D 0.747=E2=80=9D
> Rear Wheel Cylinders Bore =3D 0.748=E2=80=9D
> Clutch Master Cylinder Bore =3D 0.696=E2=80=9D
> Clutch Slave Cylinder Bore =3D 0.998=E2=80=9D
>
> Thanks
>
>
> Bob Kitterer
>
> 1960 Austin Healey Sprite (Mk IV in disguise)
> 1966 Austin Healey Sprite Mk III (Trevor) - still in boxes
> 2013 Miata
>
> Pay it forward.
> Thanks Frank
>
> ------------------------
>
> spridgets@autox.team.net
>
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> Suggested annual donation: $12.75
>
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>
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<div dir=3D"ltr">Bob,<div><br></div><div>More info;</div><div><br></div><di=
v><a href=3D"http://www.gerardsgarage.com/Garage/Tech/DbrakeUg.htm";>http://=
www.gerardsgarage.com/Garage/Tech/DbrakeUg.htm</a><br></div><div><br></div>=
<div><a href=3D"http://www.brakecylinder.com/spridgetbrakes.htm"; target=3D"=
_blank">http://www.brakecylinder.com/spridgetbrakes.htm</a><br></div><div><=
br></div><div><br></div><div><br></div></div><div class=3D"gmail_extra"><br=
><div class=3D"gmail_quote">On Sun, Jul 26, 2015 at 4:35 PM, Bob Kitterer v=
ia Spridgets <span dir=3D"ltr"><<a href=3D"mailto:spridgets@autox.team.n=
et" target=3D"_blank">spridgets@autox.team.net</a>></span> wrote:<br><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #=
ccc solid;padding-left:1ex">To begin, this entire hydraulic system is from =
a 1957 Mk IV but installed in a Bugeye.=C2=A0 The brakes and the clutch are=
separate systems.=C2=A0 Also It has used silicon break fluid since the res=
toration in 1997.=C2=A0 Jump forward to 2009, on the way to the gas station=
suffered a complete loss of brakes. No leaks, no loss of fluid.=C2=A0 Assu=
med that the seals in the master cylinder had =E2=80=9Csuddenly=E2=80=9D ce=
ased to seal, may be a bad assumption.=C2=A0 =C2=A0Anyway did a complete re=
build of both the brake and clutch master cylinders, wheel and slave cylind=
ers and calipers.=C2=A0 Afterwards was unable to get any pressure on either=
system.=C2=A0 This may have been due to the one person system bleeding met=
hod which may have introduced air into the system, a problem with silicon f=
luid.=C2=A0 The car went into storage so I could do some bucket list stuff.=
<br>
<br>
So now I have just finished disassembling the entire hydraulic system.<br>
<br>
First all the seals look new, that is setting in silicon brake fluid for ei=
ght years has not had an adverse effect.<br>
<br>
Next there is some wear on the master cylinder pistons, wheel cylinder pist=
ons and slave cylinder piston.=C2=A0 This wear seems to be just enough to r=
emove the black finish on those parts.=C2=A0 I measure less than 0.001=E2=
=80=9D wear.=C2=A0 So would assume that they are still serviceable.<br>
<br>
There is some corrosion, particularly in the rear cylinders, which needs to=
be honed out.<br>
<br>
Besides any questions, comments on the above, does anyone know what the max=
imum service diameters are for the various cylinders?<br>
<br>
Brake Master Cylinder Bore =3D 0.747=E2=80=9D<br>
Rear Wheel Cylinders Bore =3D 0.748=E2=80=9D<br>
Clutch Master Cylinder Bore =3D 0.696=E2=80=9D<br>
Clutch Slave Cylinder Bore =3D 0.998=E2=80=9D<br>
<br>
Thanks<br>
<br>
<br>
Bob=C2=A0 Kitterer<br>
<br>
1960 Austin Healey Sprite (Mk IV in disguise)<br>
1966 Austin Healey Sprite Mk III (Trevor) - still in boxes<br>
2013 Miata<br>
<br>
Pay it forward.<br>
Thanks Frank<br>
<br>
------------------------<br>
<br>
<a href=3D"mailto:spridgets@autox.team.net";>spridgets@autox.team.net</a><br=
>
<br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
<br>
Archive: <a href=3D"http://www.team.net/archive"; rel=3D"noreferrer" target=
=3D"_blank">http://www.team.net/archive</a><br>
Forums: <a href=3D"http://www.team.net/forums"; rel=3D"noreferrer" target=3D=
"_blank">http://www.team.net/forums</a><br>
ets/kevinv1275@gmail.com" rel=3D"noreferrer" target=3D"_blank">http://autox=
.team.net/mailman/options/spridgets/kevinv1275@gmail.com</a><br>
</blockquote></div><br></div>
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