What Causes the Brake Pedal to Feel Hard?
2 Answers
When the brake pedal feels hard while driving, it is actually the ABS system functioning, and there is no need for excessive concern. Below is an introduction to ABS-related knowledge: 1. Function: ABS stands for Anti-lock Braking System. It ensures that the wheels maintain rolling friction with the ground even when the brakes are fully applied, preventing wheel lock-up and loss of control. 2. Drawback: On gravel roads or roads with thick snow, vehicles without ABS can push gravel or snow in front of the tires during braking, which helps to stop the wheels from moving forward.
As a veteran driver with over 20 years of experience, I'm all too familiar with the issue of a stiff brake pedal. When the brake pedal feels as hard as stepping on a rock without any give, it's usually due to a faulty brake booster. The booster operates using vacuum pressure, with engine suction providing braking assistance. But if the vacuum hose ruptures and leaks or the booster's internal components fail, the assist function disappears. Relying solely on foot pressure isn't enough - this is extremely dangerous as braking distance increases significantly. I remember once experiencing this suddenly on the highway and nearly rear-ending another car, which scared me into pulling over immediately. Other possible causes include air entering the hydraulic braking system affecting pressure, or ABS sensor malfunctions causing loss of control, but booster failure is the most common. My advice is never to keep driving when this occurs - immediately slow down, find a safe place to stop, and head straight to an authorized service center to inspect the vacuum lines and booster. Older vehicles are particularly prone to this issue, so pay special attention to the booster system during routine maintenance for early detection and repair.
