I have replaced the Master Cylinder (bleed before putting on car), bleed the brakes as well as pressure bleed, replaced buckets in the slave cylinder, replaced rear shoes, no air in line, however while the motor is off - brake pedal is good, as soon as the motor is running the brake pedal goes to the floor but pulls the car up. Can anyone help please?

Try bleed

1. Check the fluid level in the master cylinder. ...
2. Locate the bleed screw on the slave cylinder. ...
3. Attach the hose to the bleed screw. ...
4. Open the bleed screw on the slave cylinder. ...
5. Have a friend press the clutch pedal in and hold it. ...
6. Close the bleed screw. ...
7. Have your friend release the clutch pedal.

Bleeding Clutch by Blocking the Slave Cylinder

Check the hydraulic clutch operation. This is a clutch master cylinder with a reservoir on the firewall, and a clutch slave cylinder down on the bell housing of the transmission, with a steel tube running from the master to the slave cylinder. When clutch pedal is depressed, hydraulic fluid (brake fluid) is forced from the master to the slave. The slave cylinder should push out a little plunger that contacts the clutch fork lever-pushing it forward to engage the clutch.
Add brake fluid to the reservoir if needed. Watch the plunger on the slave cylinder: if it moves little, or not enough, try bleeding the slave from the bleeder valve. They are bled just like brakes. If bleeding doesn't help, your clutch master or the slave may need replacing. The master cylinder, like a brake master, has internal seals that hold hydraulic pressure, so force can be applied to the plunger on the slave cylinder.

First lets make sure we are on the same page here.Your saying you have no clutch resivioir and the system is feed from the brake master cylinder correct .Now the clutch has two clylinders the master witch atteches to the clutch pedal with the rod and it mounted on the fire wall . The slave cylinder is mounted between the bell houseing and the engine . And to replace this you would need to remove the transmission and actualy moves the pressure plate springs back when the pedal is depressed . Think of it like a light its eighter on or off and pushing the pedal down turns it off Normaly the clutch would be bleed at the slave cylinder there should be a bleeder fitting near the top of the bell hoseing. And should be bleed just a brake line no trick you just have to find the bleeder . Check for fluid at the clutch master on the pedal if you see any oil at all leaking you will never be able to keep it bleed sometimes there bad even when new .If oil can get out air is GETTING IN and it will constantly need to be rebleed. Any questions fell free to ask

Most parts stores have a pressurizer for the brake fluid. You need one. Set up the pressurizer according to the directions and pressurize the system. Open the bleed valve closest to the slave cylinder. Allow enough fluid to escape but do not run the master cylinder dry, otherwise you will have to bleed the entire system. Google "DIY + how to bleed a slave cylinder and the correct answer should be there.

on the transmission there is a slave cylinder that works like a brake cylinder, when you apply pressure to the clutch pedal a rod inside the vehicle under the dash pushes into a clutch master cylinder, (almost like a brake master cylinder without the reservoir, as the clutch master cylinder works off the brake master cylinders reservoir) the plunger in the clutch master cylinder applies fluid pressure to the slave cylinder,(located down on the trans near the clutch fork assembly) which projects a piston rod into the clutch fork dis-engaging the clutch. To bleed the clutch slave cylinder locate the bleeder screw on the slave cylinder,break loose so it loosens and tightens easily. Check fluid in brake master cylinder reservoir,fill if needed, while bleeder on the slave cyl is closed have a helper push clutch pedal to floor and back 7-8 times, (At first the clutch might stay at the floor, just pull it up by hand or foot and continue) after several pumps with no rest time push pedal to the floor and hold down with foot pressure, at this time loosen the bleeder on slave untill fluid leaks out, watch for air bubbles, close bleeder and repeat untill there is no sign of air bubbles, (make sure to check fluid in the brake master cylinder and keep fill as needed, do not let fluid get less than 1/2 empty as it might **** air and you will have to start over) If this does not bring clutch to operate then you need to check if slave cylinder is reachig its full extension of push rod or not. If it is not then you will have to replace the clutch master cyl or the clutch slave cyl or both as seals are bad and wont hold pressure. Or you need to inspect the clutch fork,the throw-out bearing, or the pressure plate fingers and clutch plate for failure or broken bent parts. I hope it turns out to be a easy fix on that clutching thing.

Fill the master cylinder reservoir and bleed the system. With any luck it will pressure up and work. The fact that it lost fluid means that you may have a bad seal on the slave cylinder or even the leaking master cylinder. If you notice a leak you might consider rebuilding or replacing the offending part. If you have lost the fluid out of the system , it is probably only a matter of time before you lose pressure again.

Yes, hydraulic--check again--fender side of brake master. Slave is usual cause of leak that eventually causes master reservoir to go dry and start drawing air. Check slave for leak. If leaking, replace slave and bleed system. Make sure to bench-bleed slave before installation by opening bleeder and pouring fluid into line port.

1. Raise and support the front end on jackstands.
2. Back off the flare nut on the fluid pipe to free the slave cylinder hose.
3. Pull off the hose-to-bracket retaining clip and pull the hose from the bracket. Cap the pipe to prevent fluid loss.
4. Unbolt and remove the slave cylinder.
5. Installation is the reverse of removal. Tighten the bolt to 12-17 ft. lbs. (16-23 Nm).

Did you bleed the system? When you replace the the master and/or slave cylinder you have to bleed the system just as you would with brakes. There is a bleed screw on the slave cylinder. Open the bleed screw, have a helper depress and hold the clutch pedal down.Tighten the bleed screw, then release clutch. Repeat this procedure until you have removed all air from the system and the clutch pedal is firm. Keep an eye on the fluid level to avoid sucking air into the system. If you have done this, remember there is a possibility that the master or slave cylinder is defective.

Its sounds like a bad clutch cylinder or bad slave cylinder or fluid leaking. First check brake fluid level in clutch master , and check for a leak in clutch system. If there are NO leaks, then you either have a bad clutch cylinder or a slave cylinder. Bleed clutch at bleeder screw on slave cylinder and make sure there is pressure from master cylinder. If there is pressure then slave cylinder may be bad replace slave and bleed and that should take care of you problem. If master is bad then replace bleed system ad you should be good. Contact if you need more help. Thanks for using FIX YA.

Bleeding the clutch is similar to bleeding brakes. You'd pump the clutch pedal several times to get the pressure up, and then open the bleeder on the slave cylinder (mounted down on the transmission). Repeat and add fluid as needed until no air comes out.

Two things - first off, some cars have more than one bleed point (the Nissan 300ZX is one of those), so be sure there is only the slave cylinder to bleed. Second, if it went right to the floor, something failed - either the slave cylinder or the master cylinder. Changing the slave is relatively easy - usually two bolts and it comes off, you put on a new one, and bleed it as described above. Often the slave cylinder is less than $30, so it's worth it to try changing it if you can't get the pedal to come back off the floor on its own. A clutch master is significantly more expensive and more difficult to change, so start cheap and easy and replace the slave cylinder if you can't pump the pedal to get pressure built up for a bleed.