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04-28-2011, 09:46 PM
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Master Cylinder...
I bought a prebuilt 31 Chevy Street Rod about 6-7 yrs back, the master cylinder is out, soft peddle going slowly to floor, I bled the brakes. Still no brakes. it has brake drums all around.
How do I know which master cylinder replacement to buy? Thought, opinions, ideas? 
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04-28-2011, 11:50 PM
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Take it apart and measure the bore. Post a photo, maybe someone will recognize the make and model. If you like the way the brakes feel to you now, then replace it with another cylinder with the same bore size or rebuild the one you have. If you want the car to be easier to stop with less leg pressure than you currently have to give, then go with a smaller bore size cylinder. The pedal will travel further, but the car will stop easier. If the pedal travels too far now and the brakes are touchy, then you can go with the next up bore size. It will require more leg pressure to stop the car, but the pedal travel will be reduced.
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04-29-2011, 11:31 AM
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Master Cylinder
Thank you, I'll do that this weekend. I appreciate you impute!
Steve
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04-29-2011, 06:48 PM
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If it is an under the floor MC check the rod end of the piston. There will be either a hole or just a counter sink. If I remember power brakes have the hole. both bore sizes are available.
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04-29-2011, 07:46 PM
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M/c
Thanks! It all helps.
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04-29-2011, 07:55 PM
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Checkm out these guys for more info. Order their catalog. It has a lot of good info and diagrams in it.
 http://www.mpbrakes.com/
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04-29-2011, 08:12 PM
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M/c
I sent for the catalog, thank you.
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04-30-2011, 01:19 PM
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Help: Can anyone ID this master Cylinder, make/year?
This are pix of my M/C, I believe it to be a chevy. It is a 31 chevy w/327, standard brake system, drum all around. The bore on the M/C is 1" across.
This car can be frustrating running down parts. A hell of a lot of fun working on it and mostly driving her. Thank Guy's, Steve
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04-30-2011, 02:56 PM
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sscardino,
It looks like the master cylinder out of my 55 chevy 210. Scholman
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04-30-2011, 03:05 PM
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http://www.speedwaymotors.com/Single...lain,8887.html
http://www.classicchevy.com/chevy-br...1955-1958.html Thank you Scholman 
Last edited by techinspector1; 04-30-2011 at 03:13 PM.
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04-30-2011, 04:06 PM
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My 55 MC looked nothing like that....but it looks just like the MC on my 62...not a good pic
__________________
Ontario Rodders
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04-30-2011, 04:28 PM
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That cylinder is specified for '55-'64.
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04-30-2011, 04:39 PM
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__________________
Ontario Rodders
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04-30-2011, 06:00 PM
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I'll bet that one would work too, as long as it's a 1.000" bore.
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05-07-2011, 01:49 PM
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Rebuilding
I'm expecting the rebuild kit today. My first rebuild of a M/C...
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