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  1. #1
    Senior Member pockets's Avatar
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    May 2013
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    Chelsy
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    slave cylinder and master clutch cylinder testing?

    I'm wondering if there is a way to test the slave cylinder and master clutch cylinder to figure out which one isn't working properly, and how I'd go about running such a test. My truck is a 91 F-150 xlt lariat 5 speed 5.0 V8 4x4.

  2. #2
    Senior Member 5pointSlo's Avatar
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    Feb 2014
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    Well there are a couple ways to go about it. Is your fluid level low? If its an external leak you can tell by a visual inspection. Of there is no fluid loss, disconnect the line from the master to the slave. Hold your thumb over the end of the line and have a friend slowly depress the clutch pedal. Make sure not to point it at your face as it could spray. If it feels like you have good pressure, remove your finger from the line and pump some fluid into a cup or pan. If you see a lot of debris/ metal particles, its the master. If all looks OK, its most likely the slave. A lot of folks call it common practice to replace both at the same time as they both wear evenly but not all of us have the money. A few things to remember: make sure you do a good bench bleed if you are replacing the master. It can be very difficult to get all the air out if you don't. If replacing the slave, I like to open the bleeder and let it gravity bleed for 5 to 10 minutes before performing a bleed procedure. Its also very helpful to have a pressure bleeder to get a good firm pedal.

  3. #3
    Senior Member pockets's Avatar
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    Chelsy
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    Thank you that is very helpful, and it does have metal particles in the fluid.

  4. #4
    Senior Member 5pointSlo's Avatar
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    Best bet it to replace the master and bleed it very well. Take the bleeder out of the slave at first completely to try to flush out the contamination

  5. #5
    Senior Member pockets's Avatar
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    Chelsy
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    Will do. I'm not looking forward to this repair clutches are so time consuming.

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