Master Cylinder Bench Bleed CJ

[Kman]

I got a new NAPA master cylinder(Standard non-power) for my '83 CJ5 and I'm trying to bench bleed it.The rear section pumped through fine but I can't get the front section to pump fluid at all...Any ideas???

[NAILER341]

I got a new NAPA master cylinder(Standard non-power) for my '83 CJ5 and I'm trying to bench bleed it.The rear section pumped through fine but I can't get the front section to pump fluid at all...Any ideas???

swap it for another one. it is probably defective

[rick]

Keep pumpin. I had the same thing, so I returned it and got another one with the same problem apparently. I pumped it for about an hour and it still wouldn't prime. I finally ended up putting a vacuum pump on it and that was quick.

[D4x4Fish]

sounds gross but give it a little help and suck the fuild through, than bench bleed like normal.

the problem is that you have an air bubble in the piston that doesnt want to come out.

[Kman]

Back in June when I asked this I swapped the master cylinder off my CJ7 project and thhe NAPA master cylinder has been sitting on a shelf in the garage.Fast foward to October and on the way home from a Jeep run the mc stops working.I used the vacuum bleeding method and got it to bleed and the new master cylinder is working fine!!But noew the left front caliper is hanging up.I check to see if there is mud not allowing it to rlease but if not I'll swap it out for another.

[brokenujoint]

got one for a xj/tj sitting in my garage. 50.00 and its yours.

[D4x4Fish]

It sound like you have something in the pins that your caliper slides on. pull the 2 pins that hold it in place and work the sliders back in forth. Do not use grease or oil to lube! use a dry lube like silcone. you should be able to move the caliper back in forth freely.

If the piston is stuck in the caliper eirther rebuild it or replace it.