Anyone using a wilwood manual master cylinder

Brakes for your Classic Mopar

  1. Frank Dinatally

    Frank Dinatally Well-Known Member

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    I have converted manual 4 wheels drum 65 barracuda to a 4 wheel disc setup. I have a wilwood master cylinder with manual front rear adjusting valve. I get no pedal at all. I had a 15/16 bore on it and it was even worse then the 1’’ bore on it now. It has all new lines and every piece in system is new. I am at a total loss Any body with brains care to help me out... Frank
     
  2. j par

    j par Well-hung Member

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    I have a customer and we've been trying to get his willwood stuff working for some time now. We've got the front brakes working fine but have had a nightmare with the back brakes. Also the angle the booster puts that master cylinder at is a nightmare as well it's almost a 45° angle. And those little Allen bolts to take the cover off every single time what a pain in the butt... we're actually ditching all that for a factory setup that's much more user friendly....
     
  3. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

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    Have you tried a pressure bleeder?
     
  4. Biff

    Biff Cheep not easy

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    Hey Frank , some questions you bench bled the master cyl, I would presume all the caliper bleeders are at the top ? Pictures would help .cheers
     
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    • Frank Dinatally

      Frank Dinatally Well-Known Member

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      Yes we did No help
       
    • Frank Dinatally

      Frank Dinatally Well-Known Member

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      Yes bench bled.....bleeders are at top I will try to get pics
       
    • billsdartgt

      billsdartgt FABO Gold Member FABO Gold Member

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      I just installed a Wilwood on my 69 Dart - had a couple of issues I determined or believe were the problems and it works great now. I used a MC for an earlier Mustang.

      too much fluid
      had to bleed, bleed, and bleed some more - it seemed excessive and I was sure I did a good job to start - however after numerous times all is good.
      adjusted rear drums what was probably where I should have to start (all new parts - took drums and had them turned to make sure round)
       
    • Frank Dinatally

      Frank Dinatally Well-Known Member

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      Ok the wilwood is coming off and going a different route. Car has MBM discs from Mancini on the front. The new 8 3/4 rear has GM metric discs on it . On Monday I am talking to Mancini and dr diff. Most likely go with dr diff pedal ratio was figured last night and is 6 to 1
       
    • furyus2

      furyus2 Well-Known Member

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      Might need a bigger bore MC. I have the larger 2.75 caliper pistons on the front and i had to use 1 1/8.
       
    • autoxcuda

      autoxcuda Well-Known Member

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      where the rear disk also from MBM ?

      what did MBM suggest for a master.

      When going rear disk you need to have a proven matched setup with your front brakes and prices master cylinder setup.

      worth extra money to go with dr diff. For the time, effort and parts you’ve thrown at this Dr Diff would put you met ahead.

      btw, did you buy that disk rear end from FL or NY ?
       
    • Frank Dinatally

      Frank Dinatally Well-Known Member

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      The guy that built tho new rear end 8. 3/4 did everything he does on everyone he builds . GM metric calipers and disc I wrote to Mancini on Tuesday or Wednesday to talk about master and MBM brakes Never got back to me
       
    • autoxcuda

      autoxcuda Well-Known Member

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      so what did the guy that built the rear end suggest for a master cylinder for the ones he’s sold?

      Does it look like this one?: MOPAR NEW A/B/E 8 3/4 POSI REAR DISC BRAKES COMPLETE 3.23/3.55/3.73/3.91/4.10 | eBay
       
    • Frank Dinatally

      Frank Dinatally Well-Known Member

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    • autoxcuda

      autoxcuda Well-Known Member

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    • J Glenn

      J Glenn FABO Gold Member FABO Gold Member

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      I know you said you bench bled it, but are you sure you used the full travel of the pushrod? Did you use the Wilwood bench bleeding lines or make your own? Its not an MC size issue. You've gotta have air in there...
       
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      • Frank Dinatally

        Frank Dinatally Well-Known Member

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        Used the willwood bleeder and the we made our own
         
      • J Glenn

        J Glenn FABO Gold Member FABO Gold Member

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        I'd call Wilwood and ask their opinion... they do have good tech support. Unrelated to Wilwood, I recently had some sticky caliper pistons on my 4-piston Tundra calipers and I would have sworn the master cylinder was going bad... the pedal went almost to the floor. Still makes no sense to me -- but taking the calipers off and cleaning them fix everything. Made it like new.

        Oh, I assume this master has built-in residual pressure values for disk brakes? (2psi?)
         
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