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You may have a valid reason to bleed your brakes. If so, have an assistant to open the bleed valve(s) when pressure is applied to the pedal and close the bleed valve when the pedal operator indicates 1/3 or 1/2 of pedal travel has been applied. Repeat this 3-4 or more times as necessary to remove any indication of air spitting out of the bleeder. On the other hand, if you do not currently feel a 'spongy-ness' when you put the pedal down, there may not be a need to bleed the system. In other words, if the pedal is solid when applied you do have air in the lines. Because air compresses you would feel that spongy kind of pedal, hydraulic fluid does not compress and gives you a very solid bottom to the stroke. If solid pedal, then you only need to replace the pads. Don't open the bleed valves but only push the piston back into the caliper with a C clamp while having the top to the master cylinder off. Do so slowly so that you don't squirt brake fluid out of the cylinder. When finished, make sure to build pressure back up in the brake system by exercising the pedal BEFORE putting the car in gear.
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