NHTSA 21V890000
The vane cap inside the brake booster vacuum pump can wear prematurely on vehicles that experience frequent braking and/or extended periods of idling. When the vane cap wears, the pump fails and stops supplying vacuum to the brake booster.
If the brake booster loses vacuum supply, power braking assist is lost. Friction brakes still function but require significantly higher pedal effort. The sudden change in pedal feel can alarm the driver and increase the risk of a crash, especially during emergency stops.
Toyota dealers will inspect the vacuum pump assembly and repair or replace it free of charge. Repair takes approximately one hour. Owners who previously paid for related repairs may be eligible for reimbursement.