Front discs on my 68 charger???
#1050447
08/10/11 02:49 PM
08/10/11 02:49 PM
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Joined: Apr 2005
Posts: 35
A 'burb outside of Cleveland, ...
suburbanfireman
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OP
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Joined: Apr 2005
Posts: 35
A 'burb outside of Cleveland, ...
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I've tried figuring this out by reading old posts....I'm more confused now!! My 68 charger should have drums on all 4 corners. When I bought it (as a non-running basket case) it had discs on the front. I know that guys are converting their cars with a-body discs - I think that might be what the prior owner did. I just don't know what kind of master cylinder to buy for this set up. The manual master cylinder currently on the car (has #31 26(6?) 809T stamped on the bottom. I ordered a master cylinder from autozone (with same 1 inch bore) for a 68 charger with manual disc front brakes. The new m/c physically appears to be the same, but the piston stroke is about 3/4 inch too short when I push a tape measure into the bore! I know that I have 10 inch drums (with 2 3/4 wide shoes) on the rear with wheel cylinders that have #2881613T cast on the driver's side. The driver's front disc caliper bracket has 776 23258 cast on it. The front rotors appear to be 11 inches in diameter with 748 cast on the driver's side hub area. I measured the spindle (4 9/16 inches tall), and it appears that I have the (correct) needed 73-76 a-body spindles used on drum/disc conversions. I attached a picture of the brake dist block / brake switch that came with the car. What manual master cylinder should I be using? FYI - my car does not have an adjustible brake pedal actuator/lever that connects the pedal to the m/c. I'm sorry this is so long, but I am trying to paint a complete picture for you.
Last edited by suburbanfireman; 08/10/11 04:45 PM.
MY CHARGER DOESN'T LEAK OIL - IT BLEEDS AMERICAN PRIDE!
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Re: Front discs on my 68 charger???
[Re: Mr.Yuck]
#1050449
08/10/11 04:40 PM
08/10/11 04:40 PM
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Joined: Apr 2005
Posts: 35
A 'burb outside of Cleveland, ...
suburbanfireman
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A 'burb outside of Cleveland, ...
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I realize that I posted a pic of the distribution / proportioning block. Sort of threw people off the trail. I need to know what year / model master cylinder I need to order for the wacky setup in my car? Thanks  .
MY CHARGER DOESN'T LEAK OIL - IT BLEEDS AMERICAN PRIDE!
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Re: UPDATE - Front discs on my 68 charger???
[Re: suburbanfireman]
#1050450
08/10/11 06:55 PM
08/10/11 06:55 PM
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Joined: Apr 2005
Posts: 35
A 'burb outside of Cleveland, ...
suburbanfireman
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Joined: Apr 2005
Posts: 35
A 'burb outside of Cleveland, ...
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I just figured out the casting number on my master cylinder (had to really clean it off). It is #2660809. That should be for manual drum brakes on all 4 corners 67-70 B-body. I contacted Fenco direct - they said that they make one master cylinder for my car (the one I bought) M1323 or remanufactured NM1323. They said it will work on both drum & disc brake front! Does this sound right to you guys??  It does have different sized resevoirs on it like most disc brake / drum brake m/c that I've installed on other makes. Thanks in advance for your expertise!
MY CHARGER DOESN'T LEAK OIL - IT BLEEDS AMERICAN PRIDE!
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Re: Front discs on my 68 charger???
[Re: Mr.Yuck]
#1050451
08/10/11 09:59 PM
08/10/11 09:59 PM
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Joined: Feb 2005
Posts: 2,679
owt west
Thread Ender1
master
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master
Joined: Feb 2005
Posts: 2,679
owt west
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Quote:
I have a disc set form a late A-body. Manual disc I run the summit adjustable PV. Works pretty good. The one I bought brand new like yours and paid almost $100 for leaked (cracked) I had the Summit one on the shelf and dropped it in. No issues and have great pedal.
So i have a 74 Duster they will work on a 68 Charger no problem?
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Re: Front discs on my 68 charger???
[Re: Thread Ender1]
#1050453
08/11/11 08:25 AM
08/11/11 08:25 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
I have a disc set form a late A-body. Manual disc I run the summit adjustable PV. Works pretty good. The one I bought brand new like yours and paid almost $100 for leaked (cracked) I had the Summit one on the shelf and dropped it in. No issues and have great pedal.
So i have a 74 Duster they will work on a 68 Charger no problem?
I guess it's working for me.
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Re: UPDATE - Front discs on my 68 charger???
[Re: suburbanfireman]
#1050454
08/11/11 09:05 AM
08/11/11 09:05 AM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Quote:
I just figured out the casting number on my master cylinder (had to really clean it off). It is #2660809. That should be for manual drum brakes on all 4 corners 67-70 B-body. I contacted Fenco direct - they said that they make one master cylinder for my car (the one I bought) M1323 or remanufactured NM1323. They said it will work on both drum & disc brake front! Does this sound right to you guys?? It does have different sized resevoirs on it like most disc brake / drum brake m/c that I've installed on other makes. Thanks in advance for your expertise!
The Master cylinder with the bolt on cover is for DRUM brakes, a disc brake master cylinder has a much larger rear res because of the volume of fluid that goes thru the front brake circuit. the rebuilder is wrong in telling you what you have is for both , it may work , but safely as the front brakes wear ????
Maybe dr. diff or andy will chime in with what master to go to.
One question , do you want factory appearance ?
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Re: UPDATE - Front discs on my 68 charger???
[Re: JohnRR]
#1050455
08/11/11 09:21 AM
08/11/11 09:21 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
I just figured out the casting number on my master cylinder (had to really clean it off). It is #2660809. That should be for manual drum brakes on all 4 corners 67-70 B-body. I contacted Fenco direct - they said that they make one master cylinder for my car (the one I bought) M1323 or remanufactured NM1323. They said it will work on both drum & disc brake front! Does this sound right to you guys?? It does have different sized resevoirs on it like most disc brake / drum brake m/c that I've installed on other makes. Thanks in advance for your expertise!
The Master cylinder with the bolt on cover is for DRUM brakes, a disc brake master cylinder has a much larger rear res because of the volume of fluid that goes thru the front brake circuit. the rebuilder is wrong in telling you what you have is for both , it may work , but safely as the front brakes wear ????
Maybe dr. diff or andy will chime in with what master to go to.
One question , do you want factory appearance ?
Yes I used the larger rear well master cylinder...see pic.
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Re: UPDATE - Front discs on my 68 charger???
[Re: CompSyn]
#1050457
08/11/11 10:41 AM
08/11/11 10:41 AM
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Joined: Nov 2003
Posts: 2,937
GA
roadrunninMark
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master
Joined: Nov 2003
Posts: 2,937
GA
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deleted
Last edited by roadrunninMark; 08/11/11 10:53 AM.
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Re: Front discs on my 68 charger???
[Re: suburbanfireman]
#1050458
08/11/11 01:37 PM
08/11/11 01:37 PM
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Joined: Nov 2004
Posts: 9,312
SoCal
68HemiB
master
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master
Joined: Nov 2004
Posts: 9,312
SoCal
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As has been stated before, whatever master cylinder you end up using, it is IMPERATIVE that you install one meant for disc brakes. Self-adjusting drum brakes do not experience an increase the required volume of brake fluid as the brake lining wears, because the wheel cylinder pistons reside in the same area throughout the life of the shoes. The same cannot be said for disc brakes, because the caliper pistons reside further and further out of their bores as the pads wear. This is why there is a substantially larger volume of fluid capacity in the M.C. reservoir for the half of the system with the discs. 
Down to just a blue car now.
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