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post #1 of (permalink) Old 10-20-2003, 11:42 PM Thread Starter
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CJ Master Cyl. Upgrad/Replacement

Well I'm pretty sure my brake problem is with my master cylinder. I had some yellow streaks down the inside of my firewall that had been there for some time....and the dripping fluid even ate up my herculiner. The floor by the pedals often gets slick and my guess is its brake fluid. I wiped it all up and I'm waiting to see new drips coming down to verify what I think is the problem before I go tearing stuff out. Right now I've wiped everything down and am waiting. I originally thought it was my prop. valve but since wiping it down I haven't seen any fluid build up along the outside.

But onto my question. Assuming my MC is bad what is my best option? Is it rebuildable? Is it worth rebuilding if so? I only have manual brakes so I thought about adding power brakes. From what I understand that really isn't too hard to do. What MC's go easily in CJ's? I have real limited room so something with a huge booster won't work. I might just stick with manual brakes so I don't have to mess with too much. And if they worked, they would do a pretty good job. So what options are out there for me? I have disc fronts and drum rears.
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post #2 of (permalink) Old 10-21-2003, 06:49 AM
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Re: CJ Master Cyl. Upgrad/Replacement

MC rebuild kit is cheap and easy.

Unboosted brakes are working for you, and they will continue to work just as well if the engine dies. I'd stick with that.

Before you get carried away, carefully examine the diaphragm between the cover and the MC casting. It looked to me like the leak was coming from under the cover. I was going to look at it at the campground but forgot.

Also the spring that holds the cover down seemed a little weak, although probably still strong enough. You can tweak the bends a little to tighten it up.
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post #3 of (permalink) Old 10-21-2003, 07:25 AM
 
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Re: CJ Master Cyl. Upgrad/Replacement

just buy a new one i priced out the mc for my 75 and it was only 17 bucks plus 5 for the core the money saved by rebuilding it is not worth the pain in the doopa
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post #4 of (permalink) Old 10-21-2003, 11:00 AM Thread Starter
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Re: CJ Master Cyl. Upgrad/Replacement

Last night I took the time to wipe down the firewall and the master cylinder with a clean rag. Hopefully I'll be able to see where the leak is coming from. I looked under the cover to see if the rubber was damaged but it all looked good. There was no fluid under the rubber in the lid so there are no holes in that. The edges all looked good. But I'm still waiting to see if I can spot the leak.

I looked up parts availability at Autozone's website and they say a rebuild kit is unavailable. A new MC costs under $40 with a $12-14 core charge depending on which MC you buy. I think if I can narrow it down to the MC for sure I'll just buy a new one instead of rebuilding it. But first I need to make sure thats where my leak is. Either way I think I'll be sticking with the manual brakes.
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