Brake piston replacement

Hi all
Just started replacing the fron caliper pistons. when i go to put the retaining ring and wiper seel in it just bends out of shape and is then useless. Does anyone know the trick to putting these back in so they will seat properly.

thank you

Dan

put the fluid seal in first, then the piston, leaving it anout 8mm proud, to guide the wiper seal / retaining ring. fit the wiper seal into the retaining ring first (bit fiddly), then slide them down over the piston and ease them into place as best you can with your fingers. they then need tapping gently and evenly into place the last few mm. I used an old wooden ruler and a tiny hammer to do that, working my way around and around the seal a tiny bit at a time.
I did mine off the car / on the bench, which I guess, is a lot easier than on the car.

Thanks chap lots of help i was tyring to do it the way the landrover workshop manual says, just by clamping them but that was a nightmere.

thanks , Dan