A customer complains that the vehicle slows down/brakes even though the customer is not applying the brakes.
- technician a states that an overfilled master cylinder could be the cause.
- technician b states that a blocked compensating (vent) port could be the cause.

which technician is correct?
A. Technician A only
B. Technician B only
C. Both technician A and B
D. Neither technician A nor B