Brakes
A DISCONNECTED VACUUM HOSE CAN CAUSE AN INCREASE IN ENGINE IDLE SPEED AND LOSS OF BRAKE POWER ASSIST DURING BRAKE APPLICATION WITHOUT PRIOR WARNING.
The power brake booster vacuum hose may become disconnected, which can cause a high idle speed and loss of power brake assist. This may increase the risk of a crash. Dealers will inspect the power brake vacuum hose to make sure it is fully seated and clamped at the brake booster.