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rebuild master and wheel cyl

Discussion in 'Early CJ5 and CJ6 Tech' started by markyt, Mar 12, 2011.

  1. Mar 12, 2011
    markyt

    markyt New Member

    Joined:
    May 25, 2010
    Messages:
    37
    Looking for guidence/procedure,on master cyl rebuild. Will prob repl.at some time;but for now,I have rebuild kits 4 mstr and wheel cyl's.Harbor frt has a hone,I think 3/4" to 2",pretty cheap,abt $6.00.Can anyone give me a basic procedure?(60 cj5 stock F-head ,9" brakes,sngl res mstr cyl)Looks like the mstr cyl,a little tight to remove;If I can get it out,is it just a matter of tear down,run hone thru,soak rebld prts in brk fluid,and assemble? I guess I'm looking for the ( if u do it this way it will take u a day;as opposed to a week)
    I've heard that the way to go ,on fluid is #5(doesn't absorb moisture)If I rebld mstr,and wheel cyl's,do I un-hook and blow air through all seperate lines to rid of #3? Or take each ind.line and run alcohol thru them? I have the time to work on this,but not the money to repl all right now. Thanks for your help in advance.
     
  2. Mar 12, 2011
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    I suggest you use the conventional DOT4 fluid. Plenty of info on the net about brake fluid.

    A word of warning - sometimes rebuilding the cylinders works fine, sometimes they fail again in a few months. If the bore of the cylinder is pitted from water, the cylinder is junk. Rebuilt master cylinders don't seem to last very long either. Use denatured alcohol to clean the parts, then assemble with brake fluid as a lube. Make sure you don't have any grit from your hone left behind.

    The parts for the 9" brakes are expensive, esp. if you need to replace the drums and the cylinders. Rather than spending a lot of money on 9" brakes, you might consider upgrading to 11" Bendix drm brakes. This is a very popular upgrade.
     
  3. Mar 12, 2011
    repeater

    repeater I'll break it.

    Joined:
    Feb 7, 2010
    Messages:
    98
    Get a new master cylinder. They are only 40.00 and will save you headaches. Unfortunately, the wheel cylinders for these suckers are NOT cheap @ 30.00 a pop. What's the reason for the tear down and thoughts on all the cylinders? Has it been sitting for a long time? If it has, like mine, don't even bother rebuilding wheel cylinders, you just have to go new. That watery fluid sitting in the cylinders for a long time...they're done like mine were.

    Dot 5 silicone fluid sucks. Just my thoughts. Sure, it doesn't absorb water and won't ruin paint but the fluid has a squishy feel to it and coming from the track-side where most of my experience is in German road cars, it's a waste. Nothing replaces a good flush of your brake fluid at all four wheels every 20,000 miles - it's the most neglected maintenance item. If you're looking for a good fluid, check into ATE super blue or Motul...but it's really not needed. Super blue is nice because you can switch back and forth between the blue fluid and the regular clear when you flush to actually see when all the old fluid is gone.
     
  4. Mar 12, 2011
    markyt

    markyt New Member

    Joined:
    May 25, 2010
    Messages:
    37
    Thanks for the info;jeep has been sitting for about 3 yrs,on and off.
    Just trying to repair the things I can;I have the time(un employed right now) but the money is thin.Mostly tinkering to keep busy.
     
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