Clutch master cylinder rebuilt, brand new clutch slave installed. Still can't get pressure to come up after bleeding on my 85 FJ1100. Original lines and seal on master cylinder cover. I'm at a loss here, if its just a case of more bleeding but the lines aren't pressurizing at all.

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

how do u mean will not bleed it? its probably the piston in the slave cylinder sticking. try using a vacuum bleeder. keep flushing with clean fluid until bled.

It's leaking on the driver's side? That would be the master cylinder bolted onto the firewall. You will have to replace with a new or remanufactured clutch master cylinder. When the seals go out, the whole unit must be rebuilt. The store will give you a discount if you bring in your old one for exchange.
The clutch slave cylinder will be down on the transmission bell housing. Follow the small steel line from the master cylinder. It goes right to the slave cylinder.
Pretty easy to change out the master cylinder. Remove the steel line, unbolt unit from the firewall, then under the dash, there's a rod from the clutch pedal to the master cylinder. Just undo the retaining clip or pin holding the rod to the pedal. When the new unit is installed and filled with fluid, then you get to learn how to bleed the hydraulic clutch at the slave cylinder-the fun never stops.

The clutch master cylinder must have gone out, the seals in it have failed. The clutch master cylinder (next to the brake master cylinder) gives you hydraulic pressure so the clutch pedal can operate the clutch.
You can buy a new clutch master, a rebuilt unit, or yours can be rebuilt with new seals. Save time and money and buy a rebuilt or remanufactured unit. Once installed, you bleed the system down at the clutch slave cylinder, mounted on the transaxle.

remove line from the side of clutch master cylinder two bolts or nuts on firewall inside vehicle is a pin on the upper side of clutch remove and pull old unit out bench bleed new master by filling and pressing in on the piston of the master cylinder. if you dont have a hose fitting dont bench bleed bleed it in vehicle( this method takes longer) install back in vehicle and hook it all back up torque bolts to 25 ft lbs then bleed the slve cylinder from under vehicle near back of motor just like bleeding brakes pump up hold and release the line pressure by opening valve on slave cylinder.

This is a very difficult system to bleed due to the angle of the master cylinder mounting. Start by positioning the m/cyl on the handlebar where it is level with the ground. Remove the line from the m/cly and use your finger as a bleed screw to bleed the m/cyl first. Cover the hole while pumping, hold lever and release finger to release pressure, recover hole before releasing lever just as tightening a bleed screw. Repeat untill good pressure is achieved. Cap and reposition m/cyl in the threaded hole up position so as not to loose the fluid. Reinstall hose. Move to banjo bolt at slave cylinder and continue bleeding using banjo bolt as bleeder location. Finally move to normal bleed screw to insure all air is out of system. This procedure will work provided the clutch itself has not been dissassembled and reassembled improperly. Good luck!

If the master cylider and slave cylinder have been rebuilt and they won't hold, it sounds like there is an internal leak in one end of the system.
Could be a damaged (cracked) cylinder where the rubber cup will not seal.

If you put in a new slave or master you need to bench bleed them first before installing or wont work

Did any fluid come out? It has to have fluid reach the slave cylinder, and when bleed valve is open and clutch is pressed, fluid should squirt out. Open the valve and pump the clutch until fluid is forced down into the slave cylinder. Keep topping up the clutch master cylinder so it won't run dry.
Post back if still having problems. There is a tool at auto parts stores for pressure bleeding brake lines and clutch lines. It forces fluid into the lines by pressure. If nothing works, your clutch master cylinder may have failed. Take the line off at the slave cylinder and see if the master cylinder is working to push fluid through the line.

Thn the problem is the clutch master cylinder, it should build up pressure, ok try out this, remove the pipe which is going to the slave cylinder either from the clutch master cylinder or at the clutch slave cylinder and get someone to pump the pedal while you block the pipe and see if there is fluid thrown out with pressure.If there is pressure there thn fit back the pipe and refill the reserviour wth brake fluid and open the bleeding nipple at the slave cylinder let some fluid pour out and tighten it and thn pump the pedal and retry bleeding.
If there is no pressure at the pipe thn its the clutch master cylinder.
Hope this helps!