Question

Technician a states that pinching off the flexible brake hoses with vice grip pliers is a recommended method of closing rubber brake lines. technician b states that using a brake pedal holding tool to slightly apply the brakes and block off the compensating ports the master cylinder is a recommended method to minimize the brake fluid draining when brake lines or hoses are removed. who is correct?

Answer 1

In this case, Technician B is correct.
pinching off the flexible brake hoses with vice grip pliers will only make the draining process evven faster.
When the brake pedal is released, the spring-loaded piston assembly in the master cylinder returns to its rest position and it will push back the fluid that displaced by the pistons.