help w/ master cylinder - Team Camaro Tech
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post #1 of 12 (permalink) Old Mar 16th, 02, 02:28 PM Thread Starter
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I bought a master cylinder from auto zone for a 67 camaro. The only options they had was disc or drum front brakes. The master cylender has the deep hole, but how can I tell if it is for manual brakes. I converted from drum to disk and want to keep manual brakes. Part # is M1494. Any help would be great.

Thanks,
Shane
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post #2 of 12 (permalink) Old Mar 16th, 02, 02:45 PM
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Does it look exactly like your original m/c? I shouldn't. When I bought a '67 m/c for my manual disc, it had a larger front resiviour then the rear. Because the disc calipers need more fluid then the rear drum. If your new m/c has the same size resiviours, I'd be suspisious.
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post #3 of 12 (permalink) Old Mar 16th, 02, 03:00 PM Thread Starter
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It is bigger than my original one, in that it will hold more fluid. But both front and back are the same size. Just to confirm, I have front disc rear drum. Had manual before and want manual still.
Thanks,
Does this sound like the wrong one.
Shane
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post #4 of 12 (permalink) Old Mar 16th, 02, 03:24 PM
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Well I changed my car from drum to dist I put a m/c on my car from a '67 camaro with manual drums and mine was not like that. Mine had a larger front res then the rear.
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post #5 of 12 (permalink) Old Mar 16th, 02, 05:39 PM Thread Starter
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Just found this site, what do you guys think. http://www.classicperform.com/produc...elle/MCPVS.htm
This is how they describe the link, "67-79 Manual Master Cylinder and Proportioning Valve Kit - Disc/Drum"
Do you think this would work.
Thanks,
Shane
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post #6 of 12 (permalink) Old Mar 16th, 02, 09:01 PM
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The 67 manual disc is supposed to come with a 1" bore master cyl according to my catalog.
The manual MC should have the deep hole.
A really correct MC should look like the one in the photo you provided the link to. The front and rear reservoirs are same size on that one.
70's disc/drum MC's are interchangeable and have big front and small rear reservoirs.
David

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post #7 of 12 (permalink) Old Mar 17th, 02, 09:27 AM Thread Starter
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The mc that I got does have the deep hole. If I install this and its the wrong one what will happen. Will I ever know its not. And by 1" bore what bore are you talking about.
Thanks,
Shane
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post #8 of 12 (permalink) Old Mar 23rd, 02, 05:13 PM
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Sweems,
That MC you have from Auto Zone is not a 1 inch bore. I just bought the same one and realized after I got it home that the bore was too large.
Let me know where you find one "over the counter"....I need one too.
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post #9 of 12 (permalink) Old Mar 23rd, 02, 06:58 PM
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Manual disc was only available in 1967 on a Camaro. If the listing does not show a MC for a 67 with manual disc, look up a 67 Corvette with manual brakes.

The piston is made of aluminum and can be seen from the rear of the MC. Measure the bore size there.
Some people have gotten by with the 1 1/8" bore Master cyl but it will increase pedal effort by maybe 20-30 lbs over a 1" bore, but use less travel.
I have been told the manual disc brakes on a Camaro allready require a lot of pedal effort with the 1" bore.
My calculations show pedal effort of 110 lbs to lock a front wheel! 140 lbs for a 1 1/8" bore master cyl.
Can anyone verify this?
David

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[This message has been edited by davidpozzi (edited 03-23-2002).]
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post #10 of 12 (permalink) Old Mar 24th, 02, 05:27 AM
 
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David P,
What final pressure are you assuming at the brakes and what Caliper Piston Diameter with
the posted calculations? Tom V.
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post #11 of 12 (permalink) Old Mar 24th, 02, 04:42 PM Thread Starter
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Thanks for the feedback. I will check out the 67 vette M/C tommorow and see what I come up with.

Shane
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post #12 of 12 (permalink) Old Mar 26th, 02, 11:48 AM Thread Starter
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When at autozone and you ask for a 67 vette M/C. You will be ask for manual or power, and 1" bore or 1-1/8" bore. The Manual/1"bore part # is M1371, price is $25.99 w/ core.
Thanks for all the help,
Shane
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