At the minute the front brake is not working well, lots of air in it and i cannot see to bleed it. Trying to eliminate issues it could be a seal issue in the calliper (amongst others)
Is there anywhere i can get the seals from or is it new calliper if thats the issue?

Unless things have changed recently, you cannot get seal kits for Shimano brakes.

No. You have to buy a whole new calliper. Same for Magura as well

That said, if its not leaking, you don’t need new seals.

But air is getting in somewhere

Take pads out

Put an 8mm allenkey in the gap

Pull brake hard and hold

Youll see bubbles round the piston if they are weaping.

Take pads out

Put an 8mm allenkey in the gap

Pull brake hard and hold

Youll see bubbles round the piston if they are weaping.
Be very careful doing that. I’ve blown a piston seal that way.

right – elimination process starts tonight. When i stopped yesterday the lever end was popping very quietly

nothing leaking and all feels good for now – how does air get in?

i *think* the lever is sucking air in where the olive/insert is

What calliper is it I fitted some Hope mini seals into an XT M775 and ran it for nearly 2 years fine, it did change the feel of the brakes slightly though.
The calliper was done anyway so I took the chance on a £6 pair of seals.

Think its sorted 🙂