Technician A says that if brake fluid movement is observed when the service brake is depressed, there is air in the hydraulic system. Technician B says that if venting (compensating) occurs, the master cylinder is usually operating okay. Which technician is correct?

Question

Quizplus · Accepted Answer

Technician B is correct because venting (compensating) indicates that the master cylinder is functioning properly. Technician A is incorrect because brake fluid movement when the service brake is depressed does not necessarily indicate air in the hydraulic system; it could be normal fluid displacement.

Technician a Says That If Brake Fluid Movement Is Observed