Slant Six Forum :: master cylinder for 10" drums

What is a good pick for a 10" drum conversion?
Will a MC made for 9" front drums work, or should I only look for ones made for 10" brakes?
It's a 63 Signet /6 with 10" front drums (from a 66 Dart) and 9" rear drums
I'm looking only for the iron type.

Any drum-brake master cylinder will work fine. For best results, it should contain a residual pressure valve at both outlets (this can get difficult...they stopped using them for '73 when they redesigned the wheel cylinder seals.)

I can get this one today 4736338 (for 72 Dart with 9" drums) or get 4736308 tomorrow (72 with 10" drums)

When you get new wheel cylinders for cars older than a 73, do they have the new wheel cylinder seals in them?

Choose your master cylinder by piston/bore diameter, and configuration/physical compatibility, not by "power vs. manual". The master cylinder generally doesn't know whether it's bolted onto a booster or straight onto the firewall. About the only special issue to be aware of: There's a random mix of good info and nonsense in Condran's book.

Author:	sixsignet [ Tue Mar 28, 2006 3:57 pm ]
Post subject:	master cylinder for 10" drums
What is a good pick for a 10" drum conversion? Will a MC made for 9" front drums work, or should I only look for ones made for 10" brakes? It's a 63 Signet /6 with 10" front drums (from a 66 Dart) and 9" rear drums I'm looking only for the iron type.

Author:	SlantSixDan [ Tue Mar 28, 2006 4:36 pm ]
Post subject:	Re: master cylinder for 10" drums
Quote: What is a good pick for a 10" drum conversion? Will a MC made for 9" front drums work, or should I only look for ones made for 10" brakes? It's a 63 Signet /6 with 10" front drums (from a 66 Dart) and 9" rear drums I'm looking only for the iron type. Any drum-brake master cylinder will work fine. For best results, it should contain a residual pressure valve at both outlets (this can get difficult...they stopped using them for '73 when they redesigned the wheel cylinder seals.) Are you trying for a dual-pot master cylinder or a single-pot type?

Author:	sixsignet [ Tue Mar 28, 2006 4:40 pm ]
Post subject:
Dual pot. I am getting a new one from NAPA. I can get this one today 4736338 (for 72 Dart with 9" drums) or get 4736308 tomorrow (72 with 10" drums) The 9" one has 15/16 bore

Author:	emsvitil [ Tue Mar 28, 2006 4:51 pm ]
Post subject:	Re: master cylinder for 10" drums
Quote: Any drum-brake master cylinder will work fine. For best results, it should contain a residual pressure valve at both outlets (this can get difficult...they stopped using them for '73 when they redesigned the wheel cylinder seals.) When you get new wheel cylinders for cars older than a 73, do they have the new wheel cylinder seals in them?????

Author:	SlantSixDan [ Tue Mar 28, 2006 5:07 pm ]
Post subject:
Quote: I can get this one today 4736338 (for 72 Dart with 9" drums) or get 4736308 tomorrow (72 with 10" drums) Might as well get the 10" unit.

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Author:	sixsignet [ Tue Mar 28, 2006 6:54 pm ]
Post subject:
Quote: Choose your master cylinder by piston/bore diameter, and configuration/physical compatibility, not by "power vs. manual". The master cylinder generally doesn't know whether it's bolted onto a booster or straight onto the firewall. About the only special issue to be aware of: There's a random mix of good info and nonsense in Condran's book. If the mbc for 10" brakes has 1 1/16 bore and the 9" unit has 15/16 bore, or vice versa, would the 15/16 bore be preferable for drum brakes?

Author:	SlantSixDan [ Tue Mar 28, 2006 7:52 pm ]
Post subject:
Either. Do you want a harder-to-press brake pedal that doesn't travel as far (the 1-1/32" one), or an easier-to-press pedal that travels farther (the 15/16" one)?

Author:	sixsignet [ Tue Mar 28, 2006 10:26 pm ]
Post subject:
I'm not sure what I'd prefer. I'll think about it. I read somewhere that people like 15/16" for the more common disc brake conversion.

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