What happens if ATF fluid gets into the brake lines?
Ok, I am assuming you accidentally poured ATF in the master cylinder. Remove this immediately. Have the entire brake system flushed and replenished with the proper brake fluid. Brakes will not function properly with ATF. This is a dangerous situation, not to be ignored. ATF has different base chemical compositions, boiling point, and properties, and should not be mixed or substituted for in a brake system. Mixing or substituting these types of fluids will destroy rubber and plastic components within the system. It can also alter the performance characteristics of the brake system.
