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#1 |
Registered User
Join Date: May 2000
Location: bremerton wa 98310
Posts: 100
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Four Wheel Disk Brake Master Cylinder
What master cylinder would I use on my 68 converted to four wheel disk brakes it has manual brakes. THANKS
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68 lwb 383 solid roller,250dur, 582lift, afr 210s, 10.8 comp. edel.rpm, 750vs,1 3/4 headers turbo 400, 3500 stall,ford 9 inch 3.89 gears |
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#2 |
Senior Member
Join Date: Apr 2001
Location: Amazonia, Mo. USA
Posts: 2,821
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I have done some research into this.
The truck master for 71-72 is for front disc only and has a 7/8" bore. Corvettes are factory four wheel disc and have a 1" bore. I plan to use one from a 1976 Corvette that I have left over from a restoration. I will also use the Vette prop valve.
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72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide |
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#3 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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The 'vette master was going to be my suggestion as well, but another good one is a 79-81 WS6 TransAM that had factory rear discs. It might be more inline with your needs depending on what calipers you have.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#4 |
Dreams are free
Join Date: Dec 2002
Location: Hogansville Texas
Posts: 546
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on black72"s truck, he used a master clyinder, and booster off of about a 90 chevy truck,I believe, and the disk brake rear end he used was out of a caprice cop car, and he used the prop valve from it also, seems to work great, these are junk yard parts, and sound alot cheaper than anything that says corvette...lots of luck
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'68 swb fleetside originally w.i.p '68 member since 1-01 w.i.p = ( work in progress ) |
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#5 |
Registered User
Join Date: May 2000
Location: bremerton wa 98310
Posts: 100
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The trans am has a 1 1/8 bore. decisions decisions?
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68 lwb 383 solid roller,250dur, 582lift, afr 210s, 10.8 comp. edel.rpm, 750vs,1 3/4 headers turbo 400, 3500 stall,ford 9 inch 3.89 gears |
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#6 |
Registered User
Join Date: Jan 2000
Location: ca
Posts: 1,110
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i use a 76 vette master, works great
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68 short step, 406/700r4, 9" w/discs. |
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#7 |
Registered User
Join Date: Jun 2001
Location: Austin, Texas
Posts: 796
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Find a master with 1 inch or less bore. The 81 TA uses the newer style aluminum master that is 25mm bore. Brake proportioning valve from a 1977-1978 Seville with 4-wheel disc. The newer style masters have the lines reverse. Brake vacuum booster from 1983-1987 Regal/Cutlass works with the newer style masters and bolts to our trucks. I have all this stuff but have yet to take on the conversion.
Good place to look up master cylinder bore diameter www.partsamerica.com good info here http://home.pacbell.net/bigiron/Arti...rRearDisc.html
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69 SWB C/10 5-6 drop 700R4 69 Firebird Convert 455 4 spd 70 Torino GT Convert Austin-Texas |
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#8 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Thanks for those links Frank. They do not show a 302 powered 69 Camaro to look up the disc/drum Z/28 master. They show two different Corvette masters, a 1 1/8" for power brakes and a 1" for manual brakes.
For the 80 Trans Am, they show a 1" bore for manual brakes. Not sure on the depth of pushrod hole on power vs. manual mc, but on my '69 Camaro I have a Z/28 power disc master actuated manually with no problems, so there appears to be several options.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#9 |
Senior Member
Join Date: Jun 2000
Location: yucaipa ca
Posts: 580
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the trans am master is the same as cad seville. both are for power brakes. corvette is the only manual disc master i know of.
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#10 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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Like I said, if you go to partsamerica.com and look at a 1980 firebird 4 wheel disc, it shows a 1" bore master for manual.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#11 |
Registered User
Join Date: Jan 2003
Location: WESTMINSTER, MD
Posts: 60
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The one I am using on my 4wheel disc conversion is off a 77-79 caddy seville. Those cars had 4 wheel disc brakes and the reserviors are the same size front and rear. Also it seems to have the same mounting and piston depth as the one on the truck with power brakes and disc/drum.
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72 2wd Blazer 305TBI/700r4., 69 C10 SWB 400SB TPI, 400trans, Step side ., 72 4WD Blazer 350 TBI, 350 serp. drive & "Old Air" ., 94 Camaro Z28 LT1., 94 Grand Cherokee V8, 95 Grand Cherokee 6cyl. |
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#12 |
Registered User
Join Date: May 2000
Location: Frankfort, Kentucky, USA
Posts: 2,163
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I talked to the guys at ECE, they used the stock truck booster and mastercylinder and said it worked fine.
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'69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks |
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