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06-05-2011, 01:12 PM
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Aluminum Corvette style MC?
I just discovered that my 1 1/8" GM master cylinder is for disc/drum. My brakes are disc/disc, so I have to change it.
While I'm at it, I would like to change to a MC made of aluminum to save some weight. Speedway Motors sell the Corvette style MC in aluminum, but only 1" bore. I have planned and made my brake set up for 1 1/8" and I would like to stick to it. There are some 1 1/8" bore MC's on Ebay. The price indicates China stuff. Does any of you have experiences with them? I don't want to change MC type, since I have the special cap made for external inspection reservoars. 
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06-05-2011, 03:18 PM
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You don't have to change it, just pull out the residual pressure valve (if it has one) from the port going to the drum brakes and it will work perfectly.
Andy
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06-06-2011, 12:04 AM
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My master cylinder is a GM, but probably not a Corvette MC.
The two reservoirs are very different sized. The rear one is app 1/3 of the front one. I do need a new one.
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06-06-2011, 12:10 AM
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Quote:
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06-06-2011, 12:56 AM
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Yep. beyond the diffrent sized resivores, the disc/ drum master has 10# residual preassure valves built in the drum side. It could be pulled out with a sheet metal screw, but you would still be left with the wrong M/C..
Disc/Disc corvette master had a 1 1/8" bore.. Should be pretty widely available at the parts store, cap you have may work, but being for a disc/ drum it won't be right for a disc/disc with equal resivores.. Just ask for a '67 or '68 Corvette Master. actually I'm not sure what all years remained the same. I know '67-'68 are tho.
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06-06-2011, 05:46 AM
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The divider wall between the two reservoirs are in the middle of the opening at the top where it seals against the cap. So my cap will work.
The divider wall goes diagonal down agains the front reservoir and makes this much smaller than the rear one. Most of the aluminum "Corvette copy" MC's are 1" bore. 1 1/8" bore are harder to find in aluminum.
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06-06-2011, 09:32 AM
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Just bought an aluminum 1 1/8" bore MC from Pirat Jack for 125 USD insted of a -claimed to be- identical one on Ebay for 60 USD...
Hopefully i get what I pay for. Last edited by staleg; 06-06-2011 at 09:49 AM.
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06-06-2011, 07:15 PM
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If you get hung up with the new master cylinder you ordered, as I stated you can use the master cylinder you have if you remove the check valve. With the smaller reservior you will just have to be a bit more diligent on maintaining the fluid level. Without the check valve on the drum brake side, it will function exactly the same as a disk/disk master cylinder.
Andy
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06-06-2011, 11:29 PM
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Thanks for the info! I might look into that too.
I have a Jaguar IRS. Not sure how reservoir size they need. The weigth of the iron MC made me want to change to an aluminum one anyway. And with the big different in reservoir sizes, I decided to do it. QFT carb, Aluminum radiator, -water pump, -intake and -master cylinder. It should be some saved lbs, I guess. Still have iron heads, tow...
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