bad clutch master cylinder?

[swynx]

so i was bleeding the clutch on the pickup a different way...

i bought a 60ml syringe filled it with brake fluid, hooked it up to the bleeder and opened it up, i pushed fluid thru untill i couldnt any more, then i hooked up my bleeder gun to the master cylinder hose, and pulled the clutch master cylinder from the firewall and applied pressure, i got a ton more bubbles out.

installed it back into the pickup, and had the firmest clutch peddle i have felt since i have owned the pickup. started it up but still couldnt shift into any gear.

so i pulled it back out of the firewall and proceeded to bleed more air, i accidentally pumped the gun up to 25 psi and then i started getting a crap ton more air, i dropped it to 15 and closed off the bleeder valve, and it still keeps leaking like theres a leak some where. after messing with it for another hour i left it like this for about 2 hours peridocially checking on it, and its just bubble after bubble.

i now have no peddle at all ( it does come off the floor) but i have no pressure again.

the clutch master is the original as far as i know. so i suspect that to be the bad part.

 

[4x4junkie]

The way I've been bleeding these things is to just barely crack open the bleeder, then very rapidly start stomping hard on the pedal about 6-8 times, checking the fluid level after every 6-8 times. So far this has worked for me each time I've done it (3-4 times now).

If you cannot get a useable pedal no matter what, then it's quite possible your MC is bad (if the pedal has some resistance but then sinks down like there's a leak, but no fluid is actually leaking from underneath, then this points to a likely bad internal seal within the MC).

 

[will1861]

Once you get it bled again make sure you have the clutch rod seated correctly over the pin on the clutch pedal. When I replaced mine recently the clutch was the hardest that it had ever been. I was going about 70 down the interstate when the toe of my boot just knocked the pedal and it slipped to the floor. After I stopped, I pushed the rod all the way down and now my pedal is back to normal. The only thing that I can think of is, I never had it seated all the way. And it was causing the bind in the pedal. It is a night and day difference. I had drove it with the stiff pedal for over a month. I'm on my 3rd clutch in 25 years on this truck but this is the first time I changed the master cylinder. It had developed a leak at the top where the rod seats. I bench bled the cylinder first and the got my stepson to pour in fluid while I cracked the bleeder though a tube from the slave cylinder. So I knew it was bled correctly. I just couldn't figure out why it was so stiff. Good luck. It always seems it is the smallest things that drive you nuts.




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