[T3] Master Brake Cylinder, cont'd...

[Jim Adney]

On 18 Nov 2017 at 0:03, J. Jonik wrote:

> Found one spare Master Cylinder with the same configuration of brake
> lines and electrical ports.   Number embossed on the body is "61"...or
> "19"...depending on how you look at it.   No other numbers visible.  
> Does that number say that it's for a '71 specifically?

It's a 19, which is the bore diameter (3/4") to the nearest 
millimeter. All Type 3 MCs, except for a few 3/16" in very early 
ones, came with 3/4" bore MCs.  

> This spare wasn't drippy, had rusty end under the rubber boot, and had
> two electrical things screwed lightly in...hand loose.  The holes for
> the electrical things looked no different from the brake fluid line
> holes. 

Look at the bottom of the port, the small drilling that goes into the 
center of the MC. That's the part that's dramatically different.

> Then, taking it apart and re-assembling looks tricky...out of my
> league at least because I have nothing to hone the inside (if needed),
> and no cone tool to slip on new rubber rings...IF I can even find a
> re-assembly kit. 

No special assembly tools needed, if you just want to inspect the 
bore and rubber parts. A hone is cheap. There's a lot to be learned 
by just looking inside. Up to now you seem to be looking at this as a 
black box and thinking "What could possibly go wrong?" Take it apart 
and find out.

> I'm thinking to just do the job of taking a chance and put in this
> rusty (on the outside) master cylinder into the car and see what
> happens.   OR...are re-built or new ones available?   I couldn't send
> my existing MC to anywhere for core exchange or anything because then
> I'd have no car for however long it takes. 

I rebuild more MCs and calipers than anything else. You could send 
the one in your hands to me. It might not be rebuildable, but you'd 
only be out the shipping.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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