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Mystery Master Cylinder

Discussion in 'XJ Technical Chat' started by luminaman, May 25, 2011.

  1. luminaman

    luminaman Member

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    I have an 82 XJ 750. Unfortunately, I don't think the master cylinder on it is for this bike. The markings on the unit are 5/8 6 V I (or 1). Does anyone know how I can identify what master cylinder I actually have?
     
    luminaman, May 25, 2011
    #1
  2. marshallnoise

    marshallnoise Member

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    Seca or Maxim?
     
    marshallnoise, May 25, 2011
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  3. RickCoMatic

    RickCoMatic Well-Known Member

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    Post a Photograph please.
     
    RickCoMatic, May 25, 2011
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  4. zap2504

    zap2504 Member

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    Secas have a cable-actuated MC mounted on the steering head; the Maxims have one mounted on the handlebar (conventional place).
     
    zap2504, May 25, 2011
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  5. luminaman

    luminaman Member

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    It's an 82 Maxim XJ 750. I cannot seem to attach a photo. I will gladly send to your personal email if you're willing.
     
    luminaman, May 25, 2011
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  6. marshallnoise

    marshallnoise Member

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    Try photobucket.com and host the image here. It will have the "[​IMG]
     
    marshallnoise, May 25, 2011
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  7. luminaman

    luminaman Member

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    Here's the link to the pic of my master cylinder. I ordered a rebuild kit, but the piston was too long. Ironically, it matched the one I removed. No wonder the front brakes never worked too well.[​IMG]
     
    luminaman, May 25, 2011
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  8. luminaman

    luminaman Member

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    luminaman, May 26, 2011
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  9. luminaman

    luminaman Member

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    Re: Mystery Master Cylinder 7A7

    On closer examination, I found the number 7A7 stamped into the cylinder. The number is located just to the left of the opening where the piston is inserted.
     
    luminaman, May 26, 2011
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  10. schmuckaholic

    schmuckaholic Well-Known Member

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    That looks like the right one to me...
     
    schmuckaholic, May 26, 2011
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  11. RickCoMatic

    RickCoMatic Well-Known Member

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    That the one.

    A pretty simple Test is;

    Mount the MC
    Fill 1/2 full.
    Pull Brake Lever and try to develop Hydraulic Pressure.
    Observe Fluid in Reservoir.

    IF, ... Brake Fluid squirts-up like Old Faithful, ... the Seals are Bad*

    * Worn, misplaced or Cylinder is Contaminated of Pitted.

    IF,, ... the Brake Lever can build-up pressure, ... the MC is pumping OK.
     
    RickCoMatic, May 26, 2011
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