Brake issue

[Kevin au]

Hello everyone, I have a T3 that I am restoring, and I am having an issue bleeding the front brakes. I have brake fluid to the calliper and a new master cylinder. There is no oil coming from the bleed valve even if the bleeder has been removed. I am using a pressurized system to bleed. I have also tested the rear brakes and clutch all working fine. The calliper has new seals, pads, and piston, and this is the same for both front callipers.

[ZsZ]

The bleeder screw might be clogged - I even saw new bleeders having burrs inside them.

If there is no fluid even when the bleeder is fully out, then either the caliper or the piping has a clog.

Rubber brake hoses can fail and block fluid.

[maxstu]

Bleed valve removed and still no fluid? So later single piston caliper, is it? Some early calipers have two bleed valves.

I recently replaced the brake fluid on my camper using an Ezibleed system. It was rubbish.

Go back to one person at the controls and yourself at the caliper. Depress foot brake. Release bleed valve. Closed bleed valve. Release foot brake...to see if it gives better results. Works far better in my opinion.

[Kevin au]

The hoses have been replaced, and it is a single piston calliper, Girling branded, and no second bleeder. I blew compressed air through the bleeder and it's all clear. Could it be the piston blocking it, I have also fitted new discs. 

[ZsZ]

Undo the hose from the caliper to see if fluid can flow to the caliper.
The caliper bleed bore can be blocked by the crud that was in the caliper before.
You can try to poke a thin steel wire into the bleeder bore to see if there is a piece blocking it.

[Kevin au]

Brake bleeders are new and oil flows freely to the calliper.

[davidoft1]

Brake bleeders are new and oil flows freely to the calliper.

pull out the bleen nipple completely and take a look in the hole to make sure its been drilled out

[TwinTurbo]

Brake bleeders are new and oil flows freely to the calliper.

pull out the bleen nipple completely and take a look in the hole to make sure its been drilled out

If Fluid flows to the end of the flexi, thien this seems plausible if strange.. 

There is no reason a piston  should block the flow unless a fault in design/manufacture), but take out the pair of pads near the pistons and try again. At tleast then if the piston moves you know yopu have good flow.