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Rear Master Cylinder and Proportioning Valves


Zzyzx

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Rear brake mystery solved!!!

 

Took the rear master cylinder off the 83 this morning and removed the portioning valve.

Took the end cap off and removed the internal parts that could be removed,

Found that the two union bolts, one for the banjo that goes to the rear caliper hose and the other for the valve assembly, were both blocked solid with what looked like the junk from the bad reservoir hose that deteriorated from inside out. Most of the internal parts of the valve, spring, cap and valve tip, also have this buildup of goop. Everything was so blocked up the fluid could not get into the rear brake line.

 

Cleaned all the metal portioning valve parts out in acetone and emptied the master of all old fluid then blew the old fluid out the brake lines. Bleed the system a couple of times and all is good now, everything seems to be working like it should.

Will know more once I get the bike together enough to test ride it.

 

I've attached a few pictures of what I found.

Thanks for the assist on this Scott, Carl and Dan.

 

[ATTACH=CONFIG]102820[/ATTACH][ATTACH=CONFIG]102821[/ATTACH][ATTACH=CONFIG]102822[/ATTACH][ATTACH=CONFIG]102823[/ATTACH][ATTACH=CONFIG]102824[/ATTACH][ATTACH=CONFIG]102825[/ATTACH][ATTACH=CONFIG]102826[/ATTACH]

1a Valve Location.JPG

2 Valve Off.JPG

3 Valve apart.JPG

4 Valve Dissassembly.JPG

5 blocked ports.JPG

6 open port-1.JPG

7 open port-2 cleaned.JPG

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