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master cylinder thoughts

Discussion in 'Early CJ5 and CJ6 Tech' started by cayenne, Jan 14, 2013.

  1. Jan 14, 2013
    cayenne

    cayenne Member

    central Texas
    Joined:
    Dec 24, 2006
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    187
    Looking for yalls 2 cent's worth.

    It's a 1967 Jeep V6 that is driven 75% off-road and sees highway speed rarely/briefly. I have done the 11" brake swap, and brakes currently do good job of stopping the jeep.

    Right now I have the transmission out for a sm465 swap, and the body on. I have thought about installing Herm's dual reservoir master cylinder for safety due to fear of having a brake hose fail. However, I have read it is hard to do with the body on, and requires new brake lines which I don't know how to bend. I have no plan in the near future of taking the body off.

    If it ain't broke don't fix it, or tackle it now since I have decent access with the tranny out?

    I have experienced failing brakes before in an old Chevy and didn't care for it, but downshifting and luck got me out of trouble.
     
  2. Jan 14, 2013
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
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    Jul 30, 2003
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    8,409
    If you perform regular maintenance, check your fluid levels, and crawl around under the Jeep periodically, then most likely you would catch any brake fluid leak problem before disaster strikes: leak, spongy pedal, brakes pulling to one side, etc etc.
    Replace any suspect wheel cylinders or rubber brake hoses.
    Leave it as is in my opinion.
     
  3. Jan 14, 2013
    WorkInProgress

    WorkInProgress Member

    Kennewick, Wa
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    Jul 15, 2012
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    948
    It sucks off-roading and losing all brakes, trust me. Ask me how I know :oops: I do mostly road driving only so I'm probably gonna stay original a single cylinder. but if I were you I would probably upgrade to the dual cylinder for fear of going off a cliff. and remember after any water crossing you have 0 brakes, Again ask me how I know ....
     
  4. Jan 14, 2013
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Hills of NH
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    "and requires new brake lines which I don't know how to bend."

    Not difficult if you go slow, just don't kink one trying for too tight a radius. Easy with a cheap bending tool.
     
  5. Jan 14, 2013
    tarry99

    tarry99 Member

    Northern California
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    Well you want my 2 cents worth............Go with your own thought.......Herm's setup is not that bad to install with the body on , if you don't mine laying on your back. Just the Safety feature alone of the dual system in my mind is a no-brainer! You will have to cut two lines and as long as you have a tubing flare kit , flare the ends purge all the cut lines and get stainless pre-made flex hoses to do the final hookup. Just my Opinion!
     
  6. Jan 14, 2013
    Bob-The-CJ

    Bob-The-CJ Member

    Waxahachie, Texas
    Joined:
    Nov 6, 2012
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    364
    I would upgrade the brakes if you have the money - they can go with out any warning at all and I bet you right now the emergency brake will not help you if you are going over 35 mph
     
  7. Jan 14, 2013
    68BuickV6

    68BuickV6 Well-Known Member

    Norco, CA.
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    Mar 12, 2012
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    X2 dual MC
     
  8. Jan 14, 2013
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
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    I thought '67 was the 1st year for dual MC???
    I have experienced total brake failure, going down a mountain grade, and it was hair raising!
    Ironically, it wasn't caused by any brake system failure, but an exploding wheel bearing allowing
    the rear axle & brake drum to slide out past the shoes. Convert to dual MC!
     
    Last edited: Jan 14, 2013
  9. Jan 14, 2013
    68BuickV6

    68BuickV6 Well-Known Member

    Norco, CA.
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    Mar 12, 2012
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    I thought that '68 was the first year.

    It's easy enough to look at the MC and double check.
     
  10. Jan 14, 2013
    tarry99

    tarry99 Member

    Northern California
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    I thought the Dual system came out about 1972............I think?
     
  11. Jan 14, 2013
    68BuickV6

    68BuickV6 Well-Known Member

    Norco, CA.
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    Mar 12, 2012
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    While working on my CJ, I checked the brake fluid in the MC and found out it was a dual MC.
    "Wagner Made in USA" marked.

    Coulda been swapped in I suppose, but it looks like it's been there since new.
     
  12. Jan 14, 2013
    CJ Joe

    CJ Joe Truckhaven Tough!

    Pinon Hills, CA
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    Nov 9, 2002
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    My '68 has Herm's MC Conversion. It comes out fine with the body on. You just have to work on your back which you might as well get used to if you own an early jeep. The brake lines may need some re-routing. Not that hard. It's a good opportunity to learn.
     
  13. Jan 15, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Sep 23, 2002
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    Some '67's had the split system, some did not. '67 was the year mandated for the change to the split system.
     
  14. Jan 15, 2013
    cayenne

    cayenne Member

    central Texas
    Joined:
    Dec 24, 2006
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    I guess I "lucked" out and got one of the single master cylinders before the split.
     
  15. Jan 15, 2013
    jzeber

    jzeber Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Morgan Hill, Ca
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    Like many others here I would switch to a dual M/C but that is what my 71' came with.
    As others have said, brake lines are not terribly hard, get good tools for bends and flares and make sure to take your time.
     
  16. Jan 15, 2013
    69Willys

    69Willys Las Vegas, NV

    Las Vegas, NV
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    :iagree:
     
  17. Jan 15, 2013
    Bob-The-CJ

    Bob-The-CJ Member

    Waxahachie, Texas
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    Your 71 has dual? My parts Jeep 71 only had single, and mine even came with the V6
     
  18. Jan 15, 2013
    64pete

    64pete Member

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    Bending brake lines nicely is an art form. For tight spots, bend a coat hanger to use as a template, then get out from under the jeep so you aren't up-side down and backwards and bend some lines.
     
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