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I have a 1992 GMC C2500. When I got it there was no pressure at all in the clutch. I bleed it from the bleed valve for about 20 minutes to make sure there was no more air bubbles coming out. After all that there is still no pressure to the clutch. Does anyone know what might be the problem and how I can fix it? Also when i got it the person said he had replaced both the clutch master cylinder and the clutch slave cylinder.

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From what you describe I am not sure you have bled it correctly.

I suggest the following:

  1. Fill reservoir,

  2. Depress clutch pedal (person 2 or use a bar to block pedal down)

  3. Open bleed valve, close as soon as pressure goes, ( a pipe into a jar is good to keep area clean)

  4. Release pedal, wait 3 seconds then depress and hold again

  5. Repeat 3 and 4 as necessary untill you have a decent pedal.

This method moves any air bubbles through the system. If this does not work then get it bled using a pressure bleeder.

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  • Ok I'll give it another try today doing both those methods. If I were to take the slave cylinder out but leave it hooked up to the fluid line after I bleed it should there be pressure in the clutch or do I have to reinstall it before there Will be pressure?
    – Rykerblade
    Commented May 13, 2019 at 0:28
  • There is a small return spring in the slave cylinder but the pressure you feel on the pedal is from the clutch cover plate.
    – Solar Mike
    Commented May 13, 2019 at 4:10
  • Does that mean the slave cylinder needs to be bolted into place before I'll have pressure in my clutch?
    – Rykerblade
    Commented May 15, 2019 at 22:18

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