Transmission locking?

can we all just sing coombaya or however you spell it and fix trucks?





-justin

Ha ha yea I agree..

I am installing the new master cylinder right now. I am just wondering, was it supposed to have been bled on the bench before being installed? It is installed right now and the pedal will only go all the way in or all the way out and stays in those two positions. The fluid is full but not moving thru the system at all. So now I am reading and I have read about bleeding it on the bench first. Is that why it is doing this?

Zac

im not sure because i havent worked much with brakes but ive heard about the bench bleeding thing as well.





-justin

Well I took it off again (the MC) and did the whole mini hydraulic setup thing where you run a tube from the outlet back into the reservoir. I got it all primed with no air then installed it again and quickly switched to the metal hydraulic line on the truck. I attempted to bleed it w/o the slave cylinder then I hooked the slave up and tried to bleed it again. I still think there is an airlock somewhere in it. The pedal is still sticking to the floor. At the bleeder valve it is pushing the air out of the tube into my jar of brake fluid. It pulls the fluid from the jar about halfway up the tube but the rest is just air. How can I get rid of this air lock if that is what it is?

Zac

your going to have to submerge the entire input tube in fluid and then bleed the air out of the hose. if you dont then there is always goin to be that air in there im assuming.



-justin

Which tube do you mean is the input tube?

So far I have put a tube on the bleeder and submerged it in fluid while doing the push clutch down while bleeder is open then close bleeder and release the clutch.

I also tried opening the line right off the master cylinder after pumping the clutch about 10times and holding it halfway in. Then when it was open we pushed it in the other half until it was at the floor and then tightened it again it did let some of the air out but it was still the same.

I also tried using and oil pump pump some fluid up thru the bleeder screw, when the oil pump was on there and pressurized the clutch was acting normal but the moment it came off the clutch went back to no pressure again. The thing that I am wondering is how do I get the top end and master cylinder to open so the air can bubble up the reservoir because with the pressure on it I am sure it will work if I can only get it to release into the reservoir. Does the clutch need to be in for that because I did try having the clutch in while I pressurized it and it did not push anything up the reservoir.

Any thoughts?

Zac

Find someone local who knows how to bleed hydraulics, and have him show you. It's not that difficult, but not so easy to put into words. Think: air can compress, but liquids (brake fluid) essentially don't compress. Fill your reservoir with fluid, put tube over slave cylinder nipple, open bleeder, have helper slowly push down pedal, when helper reaches bottom have him hold it there while you tighten the bleeder, then he lets up the pedal, then you start the cycle again until ALL the air is out. After a few cycles top off the master cylinder reservoir so that air doesn't get into the system you just bled. Or tow it to Arizona, and I'll fix it, for $&^(Y*#@^$&**#%^@#$*&$@#%.

Lol I will give it a few more tries tonight. I got the concept of the system it just isn't pushing the air out and building pressure when I try these ways. I will see air bubbling out but still nothing changing with at the clutch pedal. The tube I am using to bleed it with is about 2.5 feet long it doesn't matter what the length is right? Anyways the only reason I am thinking it may not have been working is just because I don't think we were pushing the pedal down slowly enough and maybe it was working we just didn't do it enough. I'll try a bunch more.

Thanks,
Zac

Well I gave it a few tries and this is what happened.

So with the reservoir full and what not I connected a tube to the bleeder and opened it while the clutch was slowly depressed. When the clutch reached the bottom I tightened the bleeder and the clutch was then released. We did this probably at least 25 times. While doing that a few things that were interesting were that for one, the reservoir level did not change at all; for two when the clutch was depressed the clutch would stay down every time and had to be popped back up with your foot.

I decided to actually loosen the fitting on the master cylinder until just the last few threads and using an oil pump I pumped the fluid thru the bleeder screw up the system and at the top end where the fitting is the fluid seeped out of it with lots of air bubbles. After doing this quite a bit my dad tightened the fitting on the master and I immediately closed the bleeder.

We decided to give this one more try before checking the clutch again so samething gave it a few more pumps and it was just fluid coming out the fitting at the top.

So with everything closed and tightened like normal we checked the clutch and it was returning on its own and was starting to feel quite normal. So now we went back to the normal bleeding method and attempted that about another 20 times but it seemed like the moment I opened the bleeder vavle to start bleeding it again it seemed like the clutch immediately lost all of its pressure again and was sticking down. After those 20 trys again nothing had changed it was back to the way it was when we started trying it today...

I don't know what the problem is but it doesn't make sense I have tried every way that I can possibly think of or have read about.

Ideas? (by the way thru out EVERYTHING I did that I mentioned in this post the reservoir level did not change at all.... Could there be a problem with my new master?)

Thanks,
Zac

A few more things I wanted to mention.

When the clutch was being depressed how much fluid or volume should be transferred out the bleeder? One thing I am thinking is logically for this system to make sense the amount of fluid being pushed by the master cylinder should be equal to the amount from the slave cylinder. So with the hose on the bleeder I physically pushed the slave cylinder in and I would say probably at least 3 times the amount of fluid came out as compared to when the clutch is being depressed. Another thing is that anytime the clutch was pressed the slave cylinder did not move. I am wondering if maybe the rod going into the master from the clutch is not hooked up right or needs to be adjusted. It is pushing some fluid just not what I would guess is normal.

If you need any more info just ask... I hope this helps somewhat.

Zac