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Re: [T3] Master cylinder question

<x-flowed windows-1252>Everett Barnes wrote:

>2. What's the difference between the 19.05 drum and disc brake master
>cylinder?  There appears to be no physical differences.  Internal valves?
I was researching this a year ago when I replaced the MC on my 1964 
Notch. If I remember correctly the only difference between the 19 mm 
drum and brake MCs is that the drum MC has a bottom valve that keeps a 
little pressure in the system all the time. The disc MC has another 
bottom valve that releases the pressure completely from the system.

If this is correct (as usual I have my mauals at my parents house) you 
could use the bottom valve from your old MC and transfer it into the new 
MC. The manual also talks about two different brands of MCs, I guess ATE 
and FAG, and tells the mechanic NOT to switch internal parts between 
these two brands. This could be something to keep in mind.

>3. Should I disassemble and lubricate the NOS master cylinder with brake
>fluid before installation?  Both are in perfect external condition and the
>pistons moves smoothly when bench-tested..
I did not and that was probably not a good idea. The first times I 
pressed the brake the pedal felt much harder than usual. This was 
probably not too good for the old rubber parts in the MC. The MC has 
been working good since then, though.

Henrik Larsson, Sweden
1964 and 1968 Notches

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