rebuilding the brakes

[TheG]

Hi the last 2 days iv been stripping my brakes due to a clunking sound which is driving me mad, i was just going to replace the pins in the calipers which where pretty bad but when i went to clean the tops of the pistons inside the caliper they started crumbling away

Pistons were a nightmare to get out i managed to pump one caliper with the brake, The other caliper wouldnt pump out as i ran out of fluid i think.

After various attempts of trying to get them out with compressed air and other things they had to get pulled out with molegrips !

These are the pistons now cleaned







Picture number 3 this piston is what im worrying about although i have been told this shouldnt be a problem as its not going to be near the seals





Iv got a new seal kit ordered and some red rubber grease to rebuild the brakes.

Question is are these pistons ok ?

Do i need to rebuild my master cylinder ?

And new pads i was looking at brembo ones anyone used these before ?

Thanks