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Clutch master cylinder bleeding

 
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Old 11-04-2014, 08:56 PM
gtcrackers
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Clutch master cylinder bleeding

Any tips or advice on bleeding a clutch master cylinder?

Thanks,
 
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Old 11-05-2014, 04:36 AM
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I find the best way is to do it 'backwards'.

Use an small oil can with a pump handle, I have one that is only used for brake fluid.

Put a small clear hose on it that will fit over the bleed screw. Fill the can with brake fluid. Pump the can until the air is removed from the hose (this is why it should be clear), then install the hose over the bleed screw. Open the bleed screw and pump the brake fluid to flush the system backwards. This forces all air into the master cylinder. I use an old turkey baster to remove the excess fluid from the master cylinder. After the flush,, tighten the bleed screw and you are done, works perfect every time.

The best part is this can be done by one person.
 
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Old 11-08-2014, 08:23 PM
economan
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Been so long since i had a clutch in mine i forgot about that trick, did it a few times.
Buuuuut....If u are having a hard time getting it to bleed or stay working even tho there are no leaks etc. Just take a few minutes to check that the small hole in the master isn't plugged. Way back when, when I was backbleeding mine it would work a few days & quit again, did this a few times before i discovered a small piece of the foil from the toppa the brakefluid bottle had gotten into the reservoir and kept finding it's way back into that small hole & plugging it. Backbleeding would dislodge it, only for it to find its way back again in a couple a days.
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58 m-100 panel & 64 econo p/u
 
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Old 11-11-2014, 01:22 PM
gtcrackers
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Am I doing something wrong? I bleed the master cylinder on the bench. However, when bleeding the entire system brake fluid starts leaking inside the cab through the master cylinder. This is my third new master cylinder.

Thanks,
 
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Old 11-11-2014, 05:55 PM
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Originally Posted by gtcrackers View Post
Am I doing something wrong? I bleed the master cylinder on the bench. However, when bleeding the entire system brake fluid starts leaking inside the cab through the master cylinder. This is my third new master cylinder.

Thanks,
That does seem odd. Is there possibly a misalignment with the push rod that connects with the clutch pedal. I am thinking that if it does not leak on the bench, but does leaks with the pedal, maybe the push rod is being forced to one side and allowing the seals to leak by. Hope this helps.
 
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Old 04-14-2015, 07:48 PM
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I finally squeezed myself under the dash to see how the push rod went into the back of the master cylinder. It turns out that the push rod goes up toward the top of the cylinder. I assume that the push rod should be in the center when the clutch is pushed in. It looks like the push rod should be bent down about 1/4inch. I tried turning the rod over and that helped a little bit, but not enough.

Thanks
 
 
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