How do I remove a caliper piston without compressed air?

-Use the body of the caliper to pivot the screwdriver outward moving the piston with it. -Move each side of the piston 5-10mm at a time exposing about 25mm of the piston. -The piston will glide slowly but if it just DOES NOT MOVE do not FORCE it to the point of damaging the recess that the boot sits it.

Do you have to open bleeder valve to compress piston?

You should know that if you don't open the bleeder valve, the brake fluid in the caliper will have a very high risk of getting contaminated. Assuming you compress the caliper piston without opening the bleeder valve, you also put the ABS sensor at a high risk of getting damaged.

What can I use instead of AC clamp?

If you find yourself in a pinch without a clamp (no pun intended), maybe you have one of these alternatives around the house: a pair of pliers with a strong rubber band or tube rubber tied around the handle.

Why are my brakes still soft after bleeding?

Air in the brake line(s) is the most common cause of a soft/spongy brake pedal. If air gets into the brake lines, it can prevent brake fluid from flowing properly, causing the brake pedal to feel spongy or soft. If the brakes are soft or spongy, this is a good time to change or flush the brake fluid.

How to remove piston from brake caliper without air compressor