Brake issues 200 tdi

A weird one. I’ve replaced the front brake callipers on my 92 200tdi. I clamped the front hoses off whilst changing them. I reverse bled the brakes & everything seemed ok on a short 2 mile drive. On a longer drive the next day the pedal suddenly got soft but pumping it brought it back. Next day I again reverse bled the front brakes and everything seemed ok until I went on a longish run & now they’re worse than ever. I’m assuming there’s still air in the system but after pumping a litre of brake fluid through the front brakes I can’t see how I can get it out! Any ideas?

I read somewhere of someone fitting the calipers upside down. Bleed nipples need to be at the top.

Not a good idea to reverse bleed brakes.

Definitely at the top!
Guess I’ll have to the the old fashioned way. Any particular reason Lynall? I used the reverse bleeder as I’d used it for clutch on my Lightweight & worked a treat

Not a good thing to reverse bleed on any thing as any crud that can be in the system as in bitts of seal or the flexi hose end up in the master reservoir and cylinder.
Gravity bleed, just open a caliper nipple and wait for fluid to run clear of bubbles. [just a couple of mins]
If new master then a couple of short pumps to start fluid off then as above.
Gets fresh fluid into the system as well.