Power Disc To Maunual Disc Conversion - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

 
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post #1 of 14 (permalink) Old Sep 22nd, 08, 9:50 PM Thread Starter
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Power Disc To Maunual Disc Conversion

I did a search a while back trying to decide which master cylinder I need in order to get rid of the booster on my 69 Chevelle. On one of the threads, a MC for a '68 Camaro Manual Disc was recommended, but AutoZone can't get the Part# to cross-reference.
It Was a Kragens A1C101639. Can anyone tell me a match for this in a different product line?
I don't want to go smaller than a 1" bore. Autozone doesn't even show a Manual Disc 68, but it does list a Manual Disc 70 Camaro (Fenco 1751, uncertain bore dia.))
Any help appreciated.
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post #2 of 14 (permalink) Old Oct 4th, 08, 6:25 PM
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Re: Power Disc To Maunual Disc Conversion

I did the same conversion on my '69 and I bought the drop spindle disc brake kit from www.classicperform.com and set mine up manual disc front and drum rear. After many conversations with them and other disc brake conversion mfg's. I used a master cyl. from a '68-'72 corvette with manual brakes with a 1 inch bore. A manual brake M.C. and a power brake M.C. are different as the manual brake M.C. piston sits about 3/4 or 1 inch deep in the back of it. The power piston sits shallower.My understanding is that if you use anything bigger or smaller than 1 inch, you won't have good brakes. I believe that master cyl. was about $55.00-$60.00 from classic performance. Hope this helps. Also you need to move your brake pedal pushrod to the top hole in the pedal if you are using manual brakes for more leverage.
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post #3 of 14 (permalink) Old Oct 5th, 08, 10:56 AM
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Re: Power Disc To Maunual Disc Conversion

Have you tried searching online at the sites for Checker, NAPA, and Rock Auto? You can order online and get it mailed to you or maybe find it at a local store.
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post #4 of 14 (permalink) Old Oct 5th, 08, 11:20 AM
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Re: Power Disc To Maunual Disc Conversion

Just a heads up. isnt the corvette mastercylinder a 4 wheel disc brake master? I ended up just ordering a manual disc brake master cylinder for disc/drums over at kragen/checker auto parts. Dont forget, you need to change the pushrod, its, If you decide to make your own, its 3/8 fine thread, and the rod is 6 inches long. Jim

Jim
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post #5 of 14 (permalink) Old Oct 7th, 08, 2:25 AM Thread Starter
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Re: Power Disc To Maunual Disc Conversion

It's been awhile since I checked this thread.
I ended up going with the FENCO Reman. MC from Autozone ($16.99 w/core) It has a 1" bore, but the indentation in the rear of the piston where the pushrod goes is barely 1/4 deep. If it is possible for the pedal / lever to retract faster than the piston assy., I hope it doesn't drop down and fall out! I questioned the rod depth again, but their listing said "'70 Camaro Manual Disc"....I ended up grinding the pushrod clear down to less than 5".
Took forever to bench bleed, and control all the leaks, but works great in service. I have consistent braking and pedal effort all the time, and no "surprise-low-vacuum" to worry about on sudden stops. Wish I had done this 25 years ago....Stupid booster was always in the way of everything I needed to work on. Cleans up the firewall nicely.
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post #6 of 14 (permalink) Old Oct 7th, 08, 1:19 PM
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Re: Power Disc To Maunual Disc Conversion

I used a 68 camaro manual MC for disk drum. It is a 1 1/8" bore and is a DEEP bore so that the pushrod does not fall out.

1968 Camino Custom
468, TKO600, 3.73:1

Pic of Car: http://i52.photobucket.com/albums/g3...5/DSCN0827.jpg
Pic of 468:http://i52.photobucket.com/albums/g3...5/IMG_0233.jpg

1966 Triple Black Chevelle
327, TKO600, EFI, 4.11:1

Pic of Car: http://i52.photobucket.com/albums/g3...5/DSCN1706.jpg
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post #7 of 14 (permalink) Old Oct 7th, 08, 3:30 PM Thread Starter
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Re: Power Disc To Maunual Disc Conversion

Brett,
I went to both AutoZone and NAPA (only stores where I live) based on research of all of your posts. Sounded like what I wanted...Only problem is no one showed a Manual Disc 68 camaro or could cross the Kragens number. Would have bought yours if I could have found it...Must be the difference in where we live.
Again, the FENCO 1" cyl. (70 Camaro) is working great....Just would rather the hole for the pushrod was deeper. The Photo on AutoZone's website shows the Power cylinder barely has a divet for the pushrod. At least the manual is about 1/4" deep.
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post #8 of 14 (permalink) Old Oct 7th, 08, 3:33 PM
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Re: Power Disc To Maunual Disc Conversion

Quote:
Originally Posted by Brettd85 View Post
I used a 68 camaro manual MC for disk drum. It is a 1 1/8" bore and is a DEEP bore so that the pushrod does not fall out.
X2, it was suprisingly very easy. Didnt even have to make new brake lines.
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post #9 of 14 (permalink) Old Oct 7th, 08, 11:36 PM
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Re: Power Disc To Maunual Disc Conversion

For reference I think the part num mentioned is A1-Cardone 101639. Per Rock Auto, this comes up as:
BUICK CENTURY (1976 - 1977)
BUICK CENTURY CUSTOM (1976 - 1977)
BUICK CENTURY SPECIAL (1976 - 1977)
BUICK REGAL (1976 - 1977)
CHEVROLET EL CAMINO (1976 - 1977)
CHEVROLET EL CAMINO CLASSIC (1977)
CHEVROLET LAGUNA (1976)
CHEVROLET MALIBU (1976 - 1977)
CHEVROLET MALIBU CLASSIC (1976 - 1977)
CHEVROLET MALIBU ESTATE (1976)
CHEVROLET MONTE CARLO (1976 - 1977)
GMC SPRINT (1976 - 1977)
GMC SPRINT CUSTOM (1976 - 1977)
OLDSMOBILE CUTLASS (1977)
OLDSMOBILE CUTLASS S (1976 - 1977)
OLDSMOBILE CUTLASS SALON (1976 - 1977)
OLDSMOBILE CUTLASS SUPREME (1976 - 1977)
OLDSMOBILE CUTLASS SUPREME BROUGHAM (1976 - 1977)
OLDSMOBILE VISTA CRUISER (1976 - 1977)
PONTIAC GRAND LEMANS (1976 - 1977)
PONTIAC GRAND LEMANS BR (1976)
PONTIAC GRAND LEMANS LE (1976 - 1977)
PONTIAC GRAND LEMANS SAFARI (1977)
PONTIAC GRAND PRIX (1976 - 1977)
PONTIAC GRAND PRIX LJ (1977)
PONTIAC GRAND PRIX SJ (1977)
PONTIAC LEMANS (1976 - 1977)
PONTIAC LEMANS SAFARI (1976 - 1977)
PONTIAC LEMANS SPORT (1976 - 1977)
PONTIAC LEMANS SPORT COUPE (1976 - 1977)

(With Manual Brakes.)

Looks like a 15/16 bore master with the "deep" pushrod hole (?)
Not sure how/if this would work or fit though, just providing the cross-reference...
I personally think something this small wouldn't work well on a "stock" style manual brake system, but that's just an opinion...
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post #10 of 14 (permalink) Old Oct 7th, 08, 11:59 PM
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Re: Power Disc To Maunual Disc Conversion

What looks (maybe) more promising is A1 Cardone 101339 (1+1/8 bore, deep hole):
http://www.chevelles.com/forums/show...81#post1559181
CHEVROLET BEL AIR (1967 - 1970)
CHEVROLET BISCAYNE (1967 - 1970)
CHEVROLET BROOKWOOD (1969 - 1970)
CHEVROLET CAMARO (1967 - 1969)
CHEVROLET CAPRICE (1967 - 1970)
CHEVROLET CHEVELLE (1967 - 1970)
CHEVROLET CHEVELLE CONCOURS 1970
CHEVROLET CHEVELLE CONCOURS ESTATE 1970
CHEVROLET CHEVELLE GREENBRIER 1970
CHEVROLET CHEVELLE MALIBU 1970
CHEVROLET CHEVELLE NOMAD 1970
CHEVROLET CHEVELLE SS 1970
CHEVROLET CHEVY II NOVA 1968
CHEVROLET CORVAIR 500 1968
CHEVROLET CORVAIR MONZA 1968
CHEVROLET EL CAMINO (1967 - 1970)
CHEVROLET EL CAMINO CUSTOM 1970
CHEVROLET IMPALA (1967 - 1970)
CHEVROLET KINGSWOOD (1969 - 1970)
CHEVROLET KINGSWOOD ESTATE (1969 - 1970)
CHEVROLET MALIBU 1967
CHEVROLET MONTE CARLO 1970
CHEVROLET TOWNSMAN (1969 - 1970)
DODGE B100 VAN (1971 - 1978)
DODGE B100 VAN SPORTSMAN (1971 - 1978)
DODGE B200 VAN (1971 - 1978)
DODGE B200 VAN MAXI (1972 - 1978)
DODGE B200 VAN MAXI WAGON (1972 - 1978)
DODGE B200 VAN SPORTSMAN (1971 - 1978)
DODGE B300 VAN (1971 - 1978)
DODGE B300 VAN MAXI (1972 - 1978)
DODGE B300 VAN MAXI WAGON (1972 - 1978)
DODGE B300 VAN SPORTSMAN (1971 - 1974)
DODGE CB300 1978
DODGE D100 PICKUP (1972 - 1978)
DODGE D150 PICKUP (1977 - 1978)
DODGE D200 PICKUP (1972 - 1978)
DODGE D300 PICKUP (1973 - 1978)
DODGE D400 PICKUP 1978
DODGE D450 PICKUP 1978
DODGE RAMCHARGER (1974 - 1978)
DODGE RD200 1978
DODGE W100 PICKUP (1975 - 1977)
DODGE W150 PICKUP (1977 - 1978)
DODGE W200 PICKUP (1975 - 1978)
INTERNATIONAL 100 TRAVELALL 1974
INTERNATIONAL 1010 1972
INTERNATIONAL 1010 TRAVELALL (1972 - 1973)
INTERNATIONAL 1110 1972
INTERNATIONAL 1110 TRAVELALL 1973
INTERNATIONAL 150 1975
INTERNATIONAL 200 (1974 - 1975)
INTERNATIONAL 200 TRAVELALL 1974
INTERNATIONAL SCOUT II (1974 - 1980)
INTERNATIONAL SCOUT II SS2 (1978 - 1979)
INTERNATIONAL SCOUT II TERRA (1976 - 1980)
INTERNATIONAL SCOUT II TRAVELER (1976 - 1980)
OLDSMOBILE 98 1970
OLDSMOBILE DELTA 88 1970
OLDSMOBILE DELTA 88 CUSTOM 1970
OLDSMOBILE DELTA 88 ROYALE 1970
OLDSMOBILE TORONADO (1967 - 1969)
PLYMOUTH PB300 VAN VOYAGER (1974 - 1978)
PLYMOUTH PB300 VAN VOYAGER EX WAGON (1974 - 1976)
PLYMOUTH PB300 VAN VOYAGER MX WAGON 1978
PLYMOUTH TRAILDUSTER (1974 - 1978)
PONTIAC BONNEVILLE (1967 - 1970)
PONTIAC CATALINA (1967 - 1970)
PONTIAC CATALINA VENTURA (1968 - 1970)
PONTIAC EXECUTIVE (1967 - 1970)
PONTIAC EXECUTIVE SAFARI (1968 - 1970)
PONTIAC FIREBIRD 1967
PONTIAC FIREBIRD SPRINT 1967
PONTIAC GRAND PRIX (1967 - 1968)
PONTIAC SAFARI 1968
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post #11 of 14 (permalink) Old Oct 8th, 08, 2:22 AM Thread Starter
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Re: Power Disc To Maunual Disc Conversion

If 67-70 Chevelles fall under the same Part #, I wonder why all the emphasis on asking for a "Camaro" cylinder?
Oh well, one thing most of us can agree upon that have actually done the conversion is that it works. A cheap, easy solution to performance-cam low-vacuum issues and really cleans up a cluttered engine compartment. I think people are afraid that pedal effort will be similar to Power with the engine off, but that is simply not the case. Not only is there greater leverage with the clevis connected nearer to the fulcrum, you don't have the resistance of the diaphragm spring in the booster to overcome.
I like the feel of my foot being directly connected to the braking action, and not filtered thru that squishy, hissing booster.
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post #12 of 14 (permalink) Old Oct 8th, 08, 12:36 PM
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Re: Power Disc To Maunual Disc Conversion

I dont know why a chevelle is even listed, they never came with manual brakes when optioned with disk. As far as I know anyway...

1968 Camino Custom
468, TKO600, 3.73:1

Pic of Car: http://i52.photobucket.com/albums/g3...5/DSCN0827.jpg
Pic of 468:http://i52.photobucket.com/albums/g3...5/IMG_0233.jpg

1966 Triple Black Chevelle
327, TKO600, EFI, 4.11:1

Pic of Car: http://i52.photobucket.com/albums/g3...5/DSCN1706.jpg
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post #13 of 14 (permalink) Old Oct 8th, 08, 5:21 PM
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Re: Power Disc To Maunual Disc Conversion

I've used the cardone 10-1339 which cost under 15 bucks plus the core fee of a few dollars. If I ever get another chevelle this will be on the first things I change. I hate the booster feel and feel more in control while under heavy braking. It really cleans up then engine bay and can use any valve cover you want without clearance issues. Another bonus is you lose about 7-8 pounds from ditching the booster.
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post #14 of 14 (permalink) Old Oct 8th, 08, 7:31 PM
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Re: Power Disc To Maunual Disc Conversion

#101371 is what BillsCamino aka "Wild Bill" told me to go get. It is a 68
Corvette manual disk master cylinder. $21.99 + $12.00 core at Oreilly's.

Will
1969 Chevelle 496 BBC W/AFR 305's
Straub Tech Hyd. Roller
Tremec TKO600
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