Does anyone have a part number for the larger wheel cylinders on a '72 comet?

Discussion in 'Technical' started by Phyphor1, Nov 19, 2020.

  1. Phyphor1

    Phyphor1 Member

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    Specifically, the rear ones.

    I keep winding up with the smaller sized ones, and it's frankly frustrating.
     
  2. Jaybee

    Jaybee Member

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    From what I find these are .844 diameter: C2OZ2261C, C3OZ2261C, D3DZ2261A

    These are .906 diameter: C2SZ2261A, C3OZ2262A, C6TZ2262A, C7AZ2262A, C7AZ2262C, D1AZ2262A, D2OZ2262A, D2OZ2262B, D3OZ2262C, D3TZ2262B, D5DZ2262A
     
  3. Doug

    Doug Member

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    I found one inch diameter from napa part number up9026
     
  4. mvw66gt

    mvw66gt Member

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    These are the ones that should work. These are from Advance Auto Parts and are the Carquest Brand. I ran into the same problem ordering brake cylinders for the Maverick Rear in my 1938 Ford Coupe. I ordered ones for my 71 Comet and they were smaller. Ordered ones for a 1975 maverick and they were larger. The smaller ones are listed at 27/32" bore and the larger below at 7/8" bore.

    Rear Right; Bore: 7/8 In.
    #WCA17508
    Rear Left; Bore: 7/8 In.
    #WCA17507
     
  5. Krazy Comet

    Krazy Comet Tom

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    Ford Master Parts lists 27/32" as only cylinder '71-'73, while '74-'75 used 7/8" and '76-'77 were 15/16".
     
  6. mojo

    mojo "Everett"- Senior Citizen Supporting Member

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    Does large bore size make improvement in braking effiency
     
  7. Jaybee

    Jaybee Member

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    It changes the brake balance. The master cylinder, front wheel cylinder, and rear wheel cylinder sizes are all juggled to get the best combination of pedal pressure, pedal travel, and front/rear brake balance. A larger wheel cylinder will put more pressure against the shoes at the expense of more pedal travel. Ideally the front brakes should lock up before the rears, but only barely.
     
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