[Spridgets] Brake Questions

[Kevin Valentine]

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 at 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 has
> 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. No
> leaks, no loss of fluid.  Assumed that the seals in the master cylinder had
> “suddenly” ceased to seal, may be a bad assumption.   Anyway 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” 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 = 0.747”
> Rear Wheel Cylinders Bore = 0.748”
> Clutch Master Cylinder Bore = 0.696”
> Clutch Slave Cylinder Bore = 0.998”
>
> 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
>
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>
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