Question about 1987 GMC S-15 Pickup

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I installeda new clutch master cylinder and have been trying to bleed it for almost 2 days now.. Is there a proper way to bleed this system?

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You need to back bleed the system.
snapon and parts stores sell a bleeder but for many year i have use just a simple pump oil can and a hose to connect to your bleeder fill your oil can with brake fluid and with the cover off you master. now just pump fluid up therw your master .

Posted on Jan 02, 2009

  • Monty Johnson Feb 08, 2014

    I have a similar prob. I was told this as a solution. The man telling me this said to have bleedeer loose when this was done but of course it leaked fluid out and prob. let air in. I assume then that the bleeder should be left tight. Does this then mean that the oil can can create enough pressure to force the check ball in enough to allow the oil inwards and thru the rest of the system?

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You may not have got all of the air out of the clutch line Try bleeding it again. The sequence is as follows:
1. Start with the Master Cylinder full of fluid. (Don’t forget to check after a few bleeds that it stays above ¼ full so that you don’t introduce more air into the line).
2. Have an assistant pump the clutch pedal 2 or 3 times, then hold down.
3. Loosen bleed nipple to release any air & fluid.
4. Tighten nipple. Assistant then lets clutch pedal return. It may be necessary to manually pull back pedal if it does not return by itself.
5. Wait a few seconds then repeat the sequence from #2.
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Hydraulic clutch systems are renown for having airlocks in them once the fluid has drained out.
1.With the Master cylinder full have an assistant pump the clutch pedal acouple of times and keep it on the floor.
2. Release the bleed nipple on the slave cylinder to allow the air out and then tighten.
3. Assistant then allows pedal to come up.They may need to pull back pedal if it does not return by itself.
4.Repeat from #1 until no nore bubbles are seen coming out of the slave cylinder bleed nipple.
If you have a length of suitable size plastic tube that fits neatly over the the slave cylinder bleed nipple , the bubbles will be seen more clearly.
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Sounds like the seal in the new clutch master cylinder. I've seen that same problem in the hand brake system in small 2 and 4 seat airplanes. ( I'm and aircraft mechanic) The problem is not air in the lines so bleeding won't help. The piston seal is intermittantly failing to seal. That is whty the function can return without any apparent reason as the seal has seated itself. The only cure is to replace or rebuild the master cylinder. ( Yes, even new or rebuilt ones can have a defective or improperly installed piston seal)

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Bleeeding the clutch


This is what I would do.
Fill the master with brake fluid.
Make sure the slave cylinder bleeder is closed.
Have someone pump the clutch pedal fully down and while allowing it to come fully up about 20 times and then hold down.
Now with the clutch held down ........open the bleeder and hopefully some air will come out.
Repeat until fluid appears with out air.
The clutch master cylinder piston must be allowed to come fully back in it's cylinder to take in a new load of brake fluid with every pump and in normal operation.
Another way to bleed it......is to vacuum the fluid through the system from the master cylinder .......connecting to the slave cylinder bleeder valve.

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