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Master Cylinder replacement options

Discussion in 'Early CJ5 and CJ6 Tech' started by QC66CJ6, Sep 4, 2013.

  1. Sep 4, 2013
    QC66CJ6

    QC66CJ6 New Member

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    Degreased and power washed the Jeep this weekend. Gave me a chance to see where my leaks were coming from. One looks to be where the speedo cable plugs in, hopefully just loose. The other is the master cylinder. Did a search here for replacement options and have narrowed down to 2 for my stock drum setup. Rockauto has a few replacement singles for around $45. Should be a straight forward swap. The other option I read about was the Wilwood with remote for $20 more - http://www.summitracing.com/parts/wil-260-3378/overview/
    From what I've read would need to drill one new mounting hole, but otherwise straight forward. Advantage would be ability for remote fill and check.
    Am I missing anything about the wilwood upgrade, or would it be best to stick with the stock setup. My plan is to keep the stock drums since they seem to work well when the MC has fluid in it. Tire size will probably remain 30" for now, maybe 33" in a few years.
     
  2. Sep 4, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    If you're staying with the stock single reservoir m/c just get a stock replacement. You know the lines will mount right up, it will line right up with your pedal Pushrod, no modifications necessary, etc., etc. If you want a remote reservoir that's easy enough to do.


    Sent from my iPhone
     
  3. Sep 4, 2013
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    If your m/c is leaking it's probably time to go through & the lines & wheel cylinders too- especially if you stick with the single circuit MC. They may be OK now but they're undoubtedly on their way out & with a single circuit one failed component means no brakes at all :(

    Even without converting from the stock drums if it were me I'd look into a dual mastercylinder replacement. Herm the Overdrive Guy offers a setup that is essentially an early 70's mounting bracket & MC, there's another available from , IIRC, Randy's Ring & Pinion that uses a Willwood M/C. if you don't want to hack the frame up for a new mounting bracket then check Moses Ludel's "Jeep Rebuilder's Guide" - he has a solution that may work for you.

    I came up with my own design -

    [​IMG]



    H.
     
    47v6 likes this.
  4. Sep 4, 2013
    QC66CJ6

    QC66CJ6 New Member

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    Ok, thanks for the suggestions. I haven't pulled the wheels off yet to inspect the shoes and cylinders.
     
  5. Sep 4, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Howard, R&P are the ones that offer the conversion that uses the Wilwood m/c. I just installed one on the '59-5. I had to drill I think 3 or 4 holes in the frame and modify the lines. No other mods necessary and everything lines up great. They even supplied the residual pressure valves I needed, the t fitting for the brake lamp switch, and the correct pushrod to use the stock pedal in the kit. Was worth every penny. Much easier than "other" kits I've seen. I think it's Kaiserwillys that now stocks the R&P kit and quit stocking the "other" kit due to too many issues they were having.


    Sent from my iPhone
     
  6. Sep 4, 2013
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    I think I like mine better :twisted:

    Bolts right to the stock holes, uses the stock pushrod & comes in an assortment of colours limited only to what's found in old spray cans in my paint cabinet :D

    H :)
     
    Vanguard likes this.
  7. Sep 4, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    That looks great Howard! Will it work with stock Ross steering?


    Sent from my iPhone
     
  8. Sep 4, 2013
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    Yes, it's tight- there's about an 1/8" clearance between the rear Ross mounting bolt & the front reservoir on the M/C but nothing touches.

    H.
     
  9. Sep 4, 2013
    WorkInProgress

    WorkInProgress Member

    Kennewick, Wa
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    In my 59 CJ5 I simply bought a new single cylinder replacement and everything else brake related is new but in my 48 CJ2A I opted to install the new remote reservoir dual master cylinder kit from R&P its a wildwood m/c and seems to be well made but its not fully installed yet so I cant give a full review yet but I have high hopes for it

    I have already had a loss of brakes in my cj5 and it wasn't fun even though it was off road on a hill climb and only about 15 mph. My pto shaft for the winch came up and sheared off my brake lines at the master cylinder. I will probably be giving it a dual m/c kit from R&P soon as well.
     
    Last edited: Sep 4, 2013
  10. Sep 4, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Cool! Looks great.
    Have you been able to check the bracket for flex? You may need to add some gussets top and/or bottom if there is. Any flex in the bracket will not allow the brakes to work correctly.


    Sent from my iPhone
     
  11. Sep 5, 2013
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    3/16" plate.

    Plus the part that hooks over the pedal arm shaft will be in tension from the shaft wanting to go backwards when the pushrod is trying to push the mc forwards.

    it ain't going nowheres.

    H.
     
  12. Sep 5, 2013
    Southtowns27

    Southtowns27 Custom Title

    The Backhills of...
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    I got the dual reservoir MC conversion kit from Herm. It works awesome. It works so well, that I had to install a bias valve (cheap from Summit Racing) in the line going to the rear axle since I could lock the brakes up so easy. I have it adjusted so the fronts lock up just slightly before the rears.
     
  13. Sep 5, 2013
    jeepermc

    jeepermc Member

    Western WA
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    I just bought all new m/c, wheel cylinders and rubber lines for my 66 CJ-6 from my local Napa. Available same day and was about $250. Installed the master last night. Will work on wheel cylinders next so I can get to driving this thing. The Jeep is staying relatively stock so the stock stuff was fine for me.
     
  14. Sep 5, 2013
    curtcanada

    curtcanada L, L, and the POH!

    Western Slope, CO
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    I bought a dual MC from Herm too. I went with Herm because I switched out my drums for discs on all four hubs; and, wanted an MC that was already set up for this application. Plus, I like being able to talk to Herm, when I have questions/issues. Had to grind a little on the pushrod's original stop plate, to fit. Just in the process of installing it. Can't promise a deadline for installation, because I just end up getting frustrated :(
     
  15. Sep 5, 2013
    Southtowns27

    Southtowns27 Custom Title

    The Backhills of...
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    Ouch! Wayyyy too expensive. For Raybestos premium everything from Rockauto it would have been about $140.
     
  16. Sep 6, 2013
    Middlefork Miner

    Middlefork Miner Member

    N. Highlands Ca
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    That's good to know...I'm going to need to replace mine in the near future & have been contemplating the different options. I guess that since I have my pan off & the tranny out, I should just go ahead & get it done now...
     
  17. Sep 6, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Carefully look at reviews of The various kits if you decide to go that way. Do a search on here as there are old posts of folks asking how to resolve various problems. Some folks have had real issues with one of the kits out there. I've even seen where some folks have sold one brand of kit after having issues and purchased a different kit.


    Sent from my iPhone
     
  18. Sep 6, 2013
    jeepermc

    jeepermc Member

    Western WA
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    I justify it knowing that I'm helping the local folks that live around me keep their jobs and that when I need a part the same day my local store will still be there. To each their own though.
     
  19. Sep 8, 2013
    Middlefork Miner

    Middlefork Miner Member

    N. Highlands Ca
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    I'll never deal with one of these companys again...I think you can figure out why...:evil:
     
  20. Sep 8, 2013
    Southtowns27

    Southtowns27 Custom Title

    The Backhills of...
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    What did I miss?
     

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