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Master Cylinder Conversion

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by gt350scarowar, Mar 18, 2010.

  1. gt350scarowar

    gt350scarowar New Member

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    First time on the forum, so wanted to say hello to all, along with a questions for you if I may. Have a 66 gt350 in need of a rebuild/replacement of the ol Master cylinder. I have read where it is smart to convert from a single reservoir to a dual. I have mixed emotions around keeping the car original, vs the safety a double reservoir would bring. Anyone done the conversion, and or any suggestions, comments would be greatly appreciated.
     
  2. zrayr

    zrayr Well-Known Member

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  3. zrayr

    zrayr Well-Known Member

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    I would add that this, or any modification, that can easily removed is not a big deal.

    Make the car what you want it to be for your needs. Keep the removed parts in safe storage and restore them as needed. When you want to sell the car then put it back the way you found it.

    Z. Ray
     
  4. roddster

    roddster Well-Known Member

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    If you are not competing in Concours events often, then it is a very smart move.
    I have done this to my 66 GT coupe, it almost looks similar to the photo about. the coupe of mine is more of a track/drag/cruiser so it did not matter to me to convert it.
     
  5. 6s524

    6s524 Well-Known Member

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    +1 on the Cobra Automotive unit. The 1" bore works great on mine. Old original type is stashed away were it belongs since its a driven car.

    Welcome to the site too! Pics of your car would be cool too!

    Ken
     
  6. Texas GT350

    Texas GT350 Well-Known Member

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    I ordered one yesterday, should arrive towards the end of next week. The timing of this post was perfect for when I bled my brakes the master cylinder did not perform well so I decided to replace it to be sure.

    The dual unit cost about the same as the single so it was a no brainer. Hope it is not to hard to install!

    Ron
     
  7. zrayr

    zrayr Well-Known Member

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    I also bought the pre bent lines they sell (the ones for the original proportioning valve). They fit great.

    Z. Ray
     
  8. Texas GT350

    Texas GT350 Well-Known Member

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    I too bought the pre bent lines and the adjustable push rod to adjust the travel of the brake pedal.

    Ron
     
  9. Texas GT350

    Texas GT350 Well-Known Member

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    Installed the Cobra master cylinder and it works good. The hardest part was putting on the new push rod (the cotter pin is very hard to get in). The plumbing was not a direct fit and they had to be re-bent to fit, after about an hour it was ready to go.

    Not having anyone to help bleed the brakes I decided to try the method of using 1/4" ID tubing and a old drinking water bottle. To keep the hose in place I drilled a hole thru the cap. Putting about a 1/2" of fluid in the bottle and starting with wheel furtherest from the Master Cylinder (Right rear). Pumped about 10 time until I saw fresh fluid in the 1/4" line. Moved to the left rear, then right front and then the left front. When finished the pedal is rock hard so I am very pleased with the end result.

    Ron
     
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  10. shlby66

    shlby66 Well-Known Member

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    I installed the dual master cylinder several years ago. I think its a great
    upgrade from a safety stand point. Really, a no brainer. You can always
    change back to the old system if you feel the need. But why would you?
     
  11. shanefoster

    shanefoster Member

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    The hardest allotment was putting on the new advance rod. The accoutrements was not a absolute fit and they had to be re-bent to fit, afterwards about an hour it was accessible to go. Putting about a 1/2" of aqueous in the canteen and starting with caster furtherer from the Master Cylinder.
     

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