Brake Master Cylinder problems of the 2004 Lexus ES330

2004 Lexus Es330. Consumer states recurring problems with brakes the consumer stated the dealer replaced the master cylinder three times. Despite having the master cylinder replaced, the consumer continued to have brake issues. On the third visit, the brake caliper and brake booster were replaced. On the fourth visit, they replaced the abs actuator. The consumer was informed by the dealer that the problems she was experiencing were normal.