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Master cylinder rebuild #2894600
03/01/21 10:20 PM
03/01/21 10:20 PM
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Michigan
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A727Tflite Offline OP
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Tried the search button, no help.

Looking for some help in locating a seal kit to rebuild a master cylinder - 68-71 Hemi with discs.
For that matter, any seal kits for regular disc brake master?

I saw a thread a while back here but can’t seem to pull it up.

Anyone have info on these parts ?

Re: Master cylinder rebuild [Re: A727Tflite] #2894673
03/02/21 08:31 AM
03/02/21 08:31 AM
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Abilene, Texas
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fastmark Offline
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Dragonslayer knows the numbers.

Re: Master cylinder rebuild [Re: fastmark] #2894688
03/02/21 09:26 AM
03/02/21 09:26 AM
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Crook County, ILL
Mastershake340 Offline
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67-71 hemi disc did not all use the same master cylinder. 70-71 is different than the earlier years as touched on in this other current thread.
https://board.moparts.org/ubbthread...cylinder-any-difference.html#Post2894348
They all had 1-1/8” bores, and any MC kit for a Mopar from that era with a 1-1/8” bore can be used to pirate its seals to use to rebuild your master cylinders pistons if your pistons are in good condition to be cleaned up and reused.
The kit for 70-71 hemi masters with the 2229191 casting hasn’t been available for many decades so is very hard to find. I did have some primary piston assemblies made up through Raybestos for those a while back if anyone’s looking for one.

Re: Master cylinder rebuild [Re: Mastershake340] #2894709
03/02/21 10:03 AM
03/02/21 10:03 AM
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dragon slayer Offline
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If you have the MC apart and your pistons are good. Many are not. They can get scuffed, pitted from corrosion mixture between steel, fluid, water, aluminum. You can get seals from the 1 1/8 kit as mentioned.

The MK662 kit works.

For 67-69 B body the MC pistons were set to work with the Bendix 4 piston calipers.
70 B non hemi set for the KH Caliper.

67-70 C body kits also use same seals and some of the pistons same for some B body years.

Post your piston numbers.

I would like one of those primary pistons to get the specs off it, or if you have the design data on length, spring length, etc...

Re: Master cylinder rebuild [Re: dragon slayer] #2894954
03/02/21 07:11 PM
03/02/21 07:11 PM
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Crook County, ILL
Mastershake340 Offline
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Here is one of the primary pistons from the 70-71 hemi disc, one I made up next to an NOS one (stamped 9194). Note the NOS kit only had a primary piston, and seals to rebuild the secondary piston.

piston.JPG
Re: Master cylinder rebuild [Re: Mastershake340] #2897748
03/10/21 02:40 PM
03/10/21 02:40 PM
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california
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sbcjd Offline
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Are the numbers on the two original pistons 9194 and 6877?
Thank you

Re: Master cylinder rebuild [Re: dragon slayer] #2897792
03/10/21 03:57 PM
03/10/21 03:57 PM
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Michigan
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A727Tflite Offline OP
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Originally Posted by dragon slayer
If you have the MC apart and your pistons are good. Many are not. They can get scuffed, pitted from corrosion mixture between steel, fluid, water, aluminum. You can get seals from the 1 1/8 kit as mentioned.

The MK662 kit works.

For 67-69 B body the MC pistons were set to work with the Bendix 4 piston calipers.
70 B non hemi set for the KH Caliper.

67-70 C body kits also use same seals and some of the pistons same for some B body years.

Post your piston numbers.

I would like one of those primary pistons to get the specs off it, or if you have the design data on length, spring length, etc...


Trying to get the forward piston out. Not cooperating. Any tricks ? The bore looks pretty good with the rear piston out.
I’m guessing I need long expanding needle nose pliers to grab the piston unless there is a better way.

Re: Master cylinder rebuild [Re: sbcjd] #2897810
03/10/21 04:44 PM
03/10/21 04:44 PM
Joined: Jan 2005
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Crook County, ILL
Mastershake340 Offline
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Originally Posted by sbcjd
Are the numbers on the two original pistons 9194 and 6877?
Thank you

The NOS primary piston in the kit (bagged) is stamped 9194. The kit contains seals to rebuild the secondary piston.
The piston above it is a piston I had made by Raybestos to rebuild hemi 9191 master cylinders.

Re: Master cylinder rebuild [Re: A727Tflite] #2897811
03/10/21 04:45 PM
03/10/21 04:45 PM
Joined: Jan 2005
Posts: 8,340
Crook County, ILL
Mastershake340 Offline
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Originally Posted by Transman
Originally Posted by dragon slayer
If you have the MC apart and your pistons are good. Many are not. They can get scuffed, pitted from corrosion mixture between steel, fluid, water, aluminum. You can get seals from the 1 1/8 kit as mentioned.

The MK662 kit works.

For 67-69 B body the MC pistons were set to work with the Bendix 4 piston calipers.
70 B non hemi set for the KH Caliper.

67-70 C body kits also use same seals and some of the pistons same for some B body years.

Post your piston numbers.

I would like one of those primary pistons to get the specs off it, or if you have the design data on length, spring length, etc...


Trying to get the forward piston out. Not cooperating. Any tricks ? The bore looks pretty good with the rear piston out.
I’m guessing I need long expanding needle nose pliers to grab the piston unless there is a better way.

I've had luck using compressed air in an outlet to blow pistons out.
The commercial rebuilders actually pump grease into the outlet to force the pistons out.

Re: Master cylinder rebuild [Re: Mastershake340] #2897815
03/10/21 04:49 PM
03/10/21 04:49 PM
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california
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sbcjd Offline
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What is the number on an original secondary piston?
Thank you

Re: Master cylinder rebuild [Re: sbcjd] #2897822
03/10/21 05:21 PM
03/10/21 05:21 PM
Joined: Jan 2005
Posts: 8,340
Crook County, ILL
Mastershake340 Offline
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I just looked in my folder of notes and can’t find anything on the 9191, must have got lost.
6877 is the number on many 1-1/8” bore Mopar B body MCs with 2226821 and 2225621 casting numbers, and might be what was used on 2229191s too, but I don’t know for sure.

Re: Master cylinder rebuild [Re: Mastershake340] #2897850
03/10/21 06:33 PM
03/10/21 06:33 PM
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Posts: 3,056
Michigan
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A727Tflite Offline OP
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Originally Posted by Mastershake340
Originally Posted by Transman
Originally Posted by dragon slayer
If you have the MC apart and your pistons are good. Many are not. They can get scuffed, pitted from corrosion mixture between steel, fluid, water, aluminum. You can get seals from the 1 1/8 kit as mentioned.

The MK662 kit works.

For 67-69 B body the MC pistons were set to work with the Bendix 4 piston calipers.
70 B non hemi set for the KH Caliper.

67-70 C body kits also use same seals and some of the pistons same for some B body years.

Post your piston numbers.

I would like one of those primary pistons to get the specs off it, or if you have the design data on length, spring length, etc...


Trying to get the forward piston out. Not cooperating. Any tricks ? The bore looks pretty good with the rear piston out.
I’m guessing I need long expanding needle nose pliers to grab the piston unless there is a better way.

I've had luck using compressed air in an outlet to blow pistons out.
The commercial rebuilders actually pump grease into the outlet to force the pistons out.


Thanks. Thought of that but wasn’t sure if anything else inside would come flying out. blush

Re: Master cylinder rebuild [Re: Mastershake340] #2897865
03/10/21 07:26 PM
03/10/21 07:26 PM
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california
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sbcjd Offline
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Thank you for looking.

Re: Master cylinder rebuild [Re: sbcjd] #2897918
03/10/21 08:50 PM
03/10/21 08:50 PM
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dragon slayer Offline
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I have had luck with a wooden dowel and tapping with a hammer to compress spring and pop it up. With some lubricant. Rapid tapping. That has worked especially for the first piston. If that second piston is moving but just hanging up AND the lock screw has been removed, the compressed air should get it. Just cover with a towel good. The first time I freed one with compressed air it shot out about 100 feet. Basically an air cannon. laugh Grease also works for those that are really stuck.

Yes the 6877 is the secondary piston, which was also in the 69-70 C body Kit and 70 B body non hemi kit.

Re: Master cylinder rebuild [Re: A727Tflite] #2898917
03/14/21 04:03 AM
03/14/21 04:03 AM
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Illinois
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sixbbl 69 Offline
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what is piston size for a 69 GTX 440 engine? is it the same as the hemi car? drum front and back. or is it a 1'' piston

Re: Master cylinder rebuild [Re: sixbbl 69] #2898949
03/14/21 09:28 AM
03/14/21 09:28 AM
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dragon slayer Offline
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Yes, different MC. Pretty standard from 67 to 70. 1"

Re: Master cylinder rebuild [Re: dragon slayer] #2899231
03/15/21 03:20 AM
03/15/21 03:20 AM
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Illinois
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sixbbl 69 Offline
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thanks for your reply.







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