Update, checked retraction gap, ok, am using the existing pads. I have a remote servo fitted with flexible pipes, i sealed off the incomer to check the MC, result a solid pedal. Getting know where so decided to check the calipers, removed pistons, cleaned and checked seals, reinstated, carried out a...

Ok Huib, will remove the calipers and double check everything, let you know how things go.
John.

Can anyone help? I have a 1970 series 1 zagato, recently returned from a short journey and found the front brakes sticking, I removed the calipers and a lot of debris and refitted, unfortunately I allowed the brake fluid to get low in the MC. The problem is I cannot remove the air in the front brake...