Quote:
Originally Posted by RADRACR
Could replacing pads (the act of pushing the pistons back) damage the booster? I just finished the job and the pedal goes to the floor when the vehicle is ON, but I have a solid pedal when the vehicle is OFF. It didn't make sense for air to get in the lines on a simple pad replacement but I bled anyway. No effect.
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As far as I understand the process, you don't push the piston back when you compress the pads. Piston is normally released by springs (they're inside) when you release your brake pedal.
So when you're compressing the pads you're just pushing the fluid out back to the tank through the previously opened piston valve.