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Keep having air enter the brake system and need help narrowing down the entry point.
To bleed, I manually activate the ABS to purge the air. Then powerbleed as usual. Brakes are great for about 500-750 miles then the spongy pedal comes back.
Re- bleed using same procedure and still get air coming out of the system. I’m thinking master could be bad? Truck is a 2012 F250 with 110K.