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Master Cylinder
https://slantsix.org/forum/viewtopic.php?t=23699
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Author:  73dart_swinger [ Thu Jun 21, 2007 5:14 pm ]
Post subject:  Master Cylinder

My drum brake master cylinder is leaking. I plan on upgrading to discs in the future. Will a disc brake mc work with my drums so I don't have to buy 2 new master cylinders?

Author:  SlantSixDan [ Thu Jun 21, 2007 5:18 pm ]
Post subject: 

Yup no problem.

Author:  73dart_swinger [ Thu Jun 21, 2007 6:06 pm ]
Post subject: 

That's what I thought, just wanted to double check.

Author:  72polara [ Fri Jun 22, 2007 9:27 am ]
Post subject: 

Hey Dan, not trying to be contrary, but are you sure?

iirc, it depends on what wheel cylinders you are using... the earlier ones needed a residual pressure valve (in the MC), whereas the newer wheel cylinders and 'problem solver' wheel cylinders had an expander built into the wheel cylinder.

Or am I just confused and the residual pressure is handled by the drum brake combo valve?

Author:  SlantSixDan [ Fri Jun 22, 2007 9:41 am ]
Post subject: 

RP valves went away when wheel cylinder seals were revised in '73. It is highly, highly, highly unlikely there are any old-style wheel cylinder seals are still in the current parts market.

Author:  73dart_swinger [ Fri Jun 22, 2007 9:42 am ]
Post subject: 

My car is a 73 and I when I got it, it had a disc brake mc. It leaked but seemed to work fine.

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