brake master cylinder pushrod question - JeepForum.com
 
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post #1 of 10 Old 02-04-2018, 03:23 PM Thread Starter
clarkg
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brake master cylinder pushrod question

1978 CJ5 with manual 11" rear drums and front discs. Front brakes have the 6 bolt caliper bracket.


I ordered a replacement master cylinder and started to install it.



When I pulled the old m/c out, I noticed the pushrod was held in the master cylinder with a snap ring.



I figured I would have to move the pushrod over to my new m/c, but no luck it doesn't fit (too long).


So, I assume a PO had replaced the original m/c with a 10" unit (these seem to all come with a pushrod).



Question: Where can i get a replacement pushrod for the 11" brake m/c? None of the places I have looked include the pushrod with the master cylinder.

Thanks in advance for any help!

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post #2 of 10 Old 02-05-2018, 10:09 AM
chromegrille
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Can yours be shortened ?
Can you post a picture of yours with the length ?
Seems to be a lot of aftermarket universal push rod "kits" available as well.
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post #3 of 10 Old 02-10-2018, 10:46 AM Thread Starter
clarkg
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I have included some pictures that I hope will clarify what I am seeing.

It looks like the rod is about 1/2" too long to work with the new master cylinder.

I have seen some of the "universal" rods, but the ones I have seen online look to be too long. I think I need about a 5" pushrod.

I dont understand why the small brakes got a different arrangement from the power brakes.

I may be stuck with trying to cut the rod I have to make it fit. Sure would be nice if someone made a replacement.
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post #4 of 10 Old 02-10-2018, 11:28 AM
skizriz
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Quote:
Originally Posted by clarkg View Post
I have included some pictures that I hope will clarify what I am seeing.

It looks like the rod is about 1/2" too long to work with the new master cylinder.

I have seen some of the "universal" rods, but the ones I have seen online look to be too long. I think I need about a 5" pushrod.

I dont understand why the small brakes got a different arrangement from the power brakes.

I may be stuck with trying to cut the rod I have to make it fit. Sure would be nice if someone made a replacement.
I always thought power brake MCs had the shallow hole, and no push rod attached. And manual MCs had a deep hole with attached push rod. At least that's been my experience.

78 had both 10 and 11" brakes on them, that the year mine is. All you should need is a 11" manual MC.
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post #5 of 10 Old 02-10-2018, 11:36 AM Thread Starter
clarkg
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The m/c I have is for 11" manual brakes. It did not come with a pushrod.
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post #6 of 10 Old 02-10-2018, 11:41 AM
skizriz
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Quote:
Originally Posted by clarkg View Post
The m/c I have is for 11" manual brakes. It did not come with a pushrod.
I know when I replaced mine, it did. Sure they didn't give you a power brake MC by mistake?

All of the 78 MC for 10 and 11" manual brakes, that I just looked up, say rod included.
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post #7 of 10 Old 02-10-2018, 11:59 AM Thread Starter
clarkg
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Quote:
Originally Posted by skizriz View Post
Quote:
Originally Posted by clarkg View Post
The m/c I have is for 11" manual brakes. It did not come with a pushrod.
I know when I replaced mine, it did. Sure they didn't give you a power brake MC by mistake?

All of the 78 MC for 10 and 11" manual brakes, that I just looked up, say rod included.
I wondered about that too, but everywhere I looked, the 11" manual m/c does not come with a pushod. I put pics in my first post from the napa website.
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post #8 of 10 Old 02-10-2018, 12:06 PM Thread Starter
clarkg
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Quote:
Originally Posted by skizriz View Post
Quote:
Originally Posted by clarkg View Post
The m/c I have is for 11" manual brakes. It did not come with a pushrod.
I know when I replaced mine, it did. Sure they didn't give you a power brake MC by mistake?

All of the 78 MC for 10 and 11" manual brakes, that I just looked up, say rod included.
. Where did you find an 11" manual with rod included?
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post #9 of 10 Old 02-10-2018, 12:48 PM
skizriz
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Quote:
Originally Posted by clarkg View Post
. Where did you find an 11" manual with rod included?
Looks like the ones listed with a rod are all for 10" brakes. Interesting..
Unless it's just the pictures are wrong.
I got mine at the local NAPA. For 11" brakes, manual, with rod attached. May have been the wrong one..... Worked fine for years, until I eventually upgraded to power brakes.
Wonder if there is a difference in bore sizes between the 10" and 11"??
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post #10 of 10 Old 02-10-2018, 01:14 PM Thread Starter
clarkg
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Quote:
Originally Posted by skizriz View Post
Quote:
Originally Posted by clarkg View Post
. Where did you find an 11" manual with rod included?
Looks like the ones listed with a rod are all for 10" brakes. Interesting..
Unless it's just the pictures are wrong.
I got mine at the local NAPA. For 11" brakes, manual, with rod attached. May have been the wrong one..... Worked fine for years, until I eventually upgraded to power brakes.
Wonder if there is a difference in bore sizes between the 10" and 11"??
According to raybestos the 11" m/c has a 1-1/16" bore and the 10" m/c has a 1" bore.
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