What Causes the Hard Brake and Ineffective Braking in the Envision?
2 Answers
The first scenario is a vacuum booster pump leak or malfunction, while the second scenario occurs when the brake is pressed after the engine is turned off, which is also related to the brake booster pump. Below is some relevant information about the Envision: 1. Design: The Chinese name for the Buick ENVISION is 'Angkewei' (Envision). As a new-generation strategic model under General Motors, the Buick Envision inherits the design essence of the ENVISION concept car, featuring a dynamic, elegant, and sophisticated overall styling. 2. Exterior: The front end adopts the brand's signature waterfall-style chrome grille, complemented by wing-shaped intelligent xenon headlights, boomerang-shaped LED daytime running lights, and streamlined exterior mirrors, creating a sharp and sporty visual effect. The body features a fully-framed chrome window design, along with roof-line-following aluminum roof rails, paired with class-leading 19-inch oversized alloy wheels, delivering a striking visual impact.
I've been in the auto repair business for over 20 years. When a Buick Envision has hard brakes with poor stopping power, the most common cause is a faulty vacuum booster. Located in the engine compartment, this component uses engine vacuum to assist your braking. If it fails due to vacuum leaks or aging hoses, the pedal becomes rock-hard, requiring tremendous effort to depress while delivering subpar deceleration. Another potential culprit is air in the brake system or fluid leaks - air bubbles compromise hydraulic efficiency. ABS system malfunctions can also interfere. I've seen too many owners delay repairs, leading to catastrophic high-speed braking failures. Don't take chances; get it thoroughly inspected at a reputable shop immediately. Regular brake fluid changes and vacuum hose inspections prevent 90% of these issues.
