The vacuum check valve, fitted at the brake booster, may leak due to component tolerances within the valve assembly. Although the brake pedal can be depressed, the customer may note a change in pedal feel. This situation can occur if the vehicle sits for extended periods of time. Additional Effort Required to Press Brake Pedal Prior to Engine Initial StartĮ90, E91, E92, E93 (3 Series) produced up to 9/07Ī customer may report increased brake pedal effort prior to engine start.
