I am having trouble trying to push back the brake piston to install new brake pads. I do not want to force anything. I have tried leverage but I cannot get any movement. I could try a C-clamp but am worried about using too much force.

Is there any way to relieve the pressure to make it easier ? I thought there might be a bleed valve on the caliper, but there is only a threaded straight connector from hose to the caliper - nothing to which for instance a bleed hose could be attached. So how do you bleed these brakes ?

The caliper is a large single piston type made by LUCAS.

Someone on this forum suggested clamping the hose and opening the bleed valve to ensure no dirt in the hydraulic fuel goes back into the ABS, but there does not seem to be any bleed valve, so that I cannot even do that.

Any suggestions please ?