cheaper solution to Wilwood 7/8 bore master cylinder

[70Nova4dr]

I bought Wilwood's 140-2285 kit for my 70 Nova, now im looking for a master cylinder to match. I emailed Wilwood and they recommended there master cylinder part # 9439 (7/8 " bore). Anyone know a cheaper master cylinder equivalent to this $200 master that would work? It's a manual brake car and was a 4 wheel drum car if that helps. Thanks Brandon

[novaderrik]

it think it was a 1975 Chevy Monza that had a 7/8" bore master cylinder. also, i think the late 60's vettes with manual brakes had a 7/8" master cylinder, as well. hit up a few auto parts store websites and start plugging in cars until you find one that will work..

[AM.MSCL]

Talk to Frank at Prodigy Customs he got me set up with a FatBoy Master cylinder for my wilwood brakes and it was a little less then half of what the wilwood option was $ wise!
Ray
PS Be prepared to talk about cars for an hour or two when you call him!

[MonzaRacer]

Actually if I remember correctly the Hbody master cyl is 3/4 but Ill have to double check,I have one out on the deck, so I can measure it.

[andrewb70]

1979 Monte Carlo, 6 cyl, manual brakes MC. 15/16" bore and about $30 bucks, available anywhere.

Andrew

[a67]

Here are a couple in 7/8" bore:

Raybestos # MC 39027 (L.H.) (cast iron) 7/8 bore (manual & power)
'76-80 GM Monza • Sky Hawk • Starfire • Sunbird


OEM 1982 Mustang Manual Brake 7/8” master cylinder, Bendix # 11764

Bob.

[Rick Dorion]

I used the 82 mustang. The ports are on the engine side and the mounting holes need to be elongated a bit.

[70Nova4dr]

My Monza 7/8 " bore master arrived today at the the auto parts store. Thanks for all the help guys.

[ULTM8Z]

Sorry... reviving an old thread...

Does this Monza 7/8" bore MC work on 4-wheel disc brakes?

[Craig510]

Master cylinders do not know what they are connected to. As long as they don’t have the residual valves built into them, disc/drum or a clutch slave is all the same.

[andrewb70]

I now have a MC from a Dodge Sprint on my GTO. It's aluminum with a plastic reservoir, 7/8" bore. Just needed to elongate the mounting holes to make it work. I think it was about $70 from O'Reilly's

Andrew

[ULTM8Z]

I now have a MC from a Dodge Sprint on my GTO. It's aluminum with a plastic reservoir, 7/8" bore. Just needed to elongate the mounting holes to make it work. I think it was about $70 from O'Reilly's

Andrew

Now that's interesting... I was thinking about changing over to the newer style MC's... thanks for the info.

Question on the Monza MC, is that I'm finding that it's "designed to sit level with the ground". Since I have a power brake application that will prop it up at an angle, does this render that MC incompatible with my application?

Basically I'm attempting to duplicate the C4 Corvette set up. My Baer system (about 2001 vintage) has the C4 calipers. Below is info I found online regarding C4 brakes. Since I have a 3.5:1 pedal ratio, using the 7/8" bore would effectively duplicate the 88-91 set up.

88-'91

MC Bore .87"
Wheel cylinder bore 1.5" (dual) front 1.6" rear
Pedal arc ratio 3.5 to 1
Line pressure with 100 lb on pedal 1250 front 750 rear

'92-'96

MC Bore .93"
Wheel cylinder bore 1.5" (dual) front 1.6" rear
Pedal arc ratio 4.0 to 1
Line pressure with 100 lb on pedal 1160 front 680 rear