The Ford Barn

Bassman/NZ · 01-18-2013, 07:42 PM

Is a 1" bore dual master cylinder big enough for 39-48 brakes, or should I go to 1 1/8"?

Mart · 01-18-2013, 08:04 PM

Bit of a funny one, this. Ideally a 1-1/16" diameter cylinder would be ideal, all other things being equal. I looked for a long time and came to the conclusion there are no drum/drum dual cylinders in the 1-1/16" size. I bought a cylinder for a 77 E150 van - 1-1/16" diameter, disc/drum. Only thing is, it has no residual valves.

Personally I'd go for 1-1/16", 1-1/8", 1", in that order of preference, but compensate with pedal ratio if possible.

Old rusty has a 1" cylinder and it feels like a little too much travel unless brakes are adjusted very often.

Other peoples opinions may vary.

Double check the model I quoted, you can get the sizes off the Rockauto.com website.

Mart.

Shadetree · 01-18-2013, 08:20 PM

A 1" will give you more braking power than a 1 1/16". A 1 1/-16" will move more fluid if that is your question. The difference may be negligible.

miss victoria · 01-18-2013, 08:30 PM

yes 1 inch bore is what i use

Bassman/NZ · 01-19-2013, 12:35 AM

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Thanks for the help fellas.

01-18-2013, 07:42 PM	#1
Bassman/NZ Senior Member Join Date: May 2010 Location: Napier, New Zealand Posts: 2,001	Master cylinder ??? Is a 1" bore dual master cylinder big enough for 39-48 brakes, or should I go to 1 1/8"?

01-18-2013, 08:04 PM	#2
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 9,088	Re: Master cylinder ??? Bit of a funny one, this. Ideally a 1-1/16" diameter cylinder would be ideal, all other things being equal. I looked for a long time and came to the conclusion there are no drum/drum dual cylinders in the 1-1/16" size. I bought a cylinder for a 77 E150 van - 1-1/16" diameter, disc/drum. Only thing is, it has no residual valves. Personally I'd go for 1-1/16", 1-1/8", 1", in that order of preference, but compensate with pedal ratio if possible. Old rusty has a 1" cylinder and it feels like a little too much travel unless brakes are adjusted very often. Other peoples opinions may vary. Double check the model I quoted, you can get the sizes off the Rockauto.com website. Mart.

01-18-2013, 08:20 PM	#3
Shadetree Senior Member Join Date: May 2010 Location: Cottageville, WV Posts: 1,535	Re: Master cylinder ??? A 1" will give you more braking power than a 1 1/16". A 1 1/-16" will move more fluid if that is your question. The difference may be negligible. __________________ Son, you will never blow an engine up in high gear.

01-18-2013, 08:30 PM	#4
miss victoria Senior Member Join Date: Oct 2011 Posts: 310	Re: Master cylinder ??? yes 1 inch bore is what i use

01-19-2013, 12:35 AM	#5
Bassman/NZ Senior Member Join Date: May 2010 Location: Napier, New Zealand Posts: 2,001	Re: Master cylinder ??? Sponsored Links (Register now to hide all advertisements) Thanks for the help fellas.