What Causes Hard Braking?

[VonIsabella]

The reasons for hard braking include issues with the brake booster pump, foreign objects adhering to the brake pads and calipers, and the vehicle's ABS system engaging. In case of hard braking, you can ease off the accelerator to slow down and try pressing the brake pedal several times to see if braking force can be restored. Causes of hard braking: Issues with the brake booster pump. If the brake suddenly becomes hard while driving, it may be due to a vacuum tube leak or blockage in the brake booster pump. In such cases, the vehicle should be stopped immediately for inspection, and replacement may be necessary if required. If the brake becomes hard after the engine is turned off, it is usually because the brake pedal was pressed continuously after the engine was turned off, causing the vacuum force of the brake booster pump to be depleted. In this situation, simply restarting the engine to allow the brake booster pump to resume operation will resolve the issue. Foreign objects adhering to the brake pads and calipers. If there are foreign objects on the brake pads or calipers, the friction caused by these objects during braking may create a sensation of hard braking. This issue can be resolved by cleaning the affected parts. Vehicle ABS system engagement. During emergency braking, the vehicle's ABS system intervenes to prevent wheel lock-up and loss of control, which can lead to accidents. This intervention causes a rebound effect in the brake pedal. This is a normal phenomenon, and gently pressing the brake pedal again will restore normal braking.

[SanEloise]

Recently, while driving, my brake pedal suddenly became very stiff, which I had experienced before with my old car. A stiff brake pedal is mostly caused by a problem with the vacuum booster. If the brake pedal becomes stiff after the engine stalls, it's normal because the booster system isn't working. However, if it's stiff while driving, it's dangerous—it could be due to a leak in the booster or a ruptured vacuum hose, leading to insufficient vacuum pressure and reduced braking assistance. In such cases, braking requires much more effort, and the braking force weakens, increasing stopping distance and the risk of accidents. I once nearly rear-ended another car during emergency braking because I didn't address the issue promptly. If you notice this problem, it's advisable to stop and check the booster system or brake fluid immediately. Take it to a professional repair shop to have a technician test for leaks and inspect the booster's condition—safety should never be taken lightly.

[SanKai]

I remember being quite scared when my new car's brakes became stiff shortly after purchase. After researching and discussing with friends, I learned that stiff brakes are commonly caused by vacuum booster failure or air leaks in the brake system. When the booster fails, it can't provide normal pneumatic assistance, making the pedal feel hard - requiring deep pressure for any response, with inconsistent braking force. Additionally, cracks in brake fluid lines or pump malfunctions could also cause this. If this happens while driving, pull over and turn off the engine immediately - don't push forward as increased stopping distance could lead to collisions. Later at the repair shop, the mechanic diagnosed it as aged booster seals and replaced them at reasonable cost. Remember not to delay getting it fixed.

[McAxel]

Don't panic if you encounter hard brakes. The common cause is usually a failed vacuum booster. The system relies on the booster to provide air pressure to assist with braking. If it fails, the pedal becomes stiff, whereas normal brake pedals feel soft and responsive. It could also be caused by air leaks in the brake system or blocked oil lines. In such cases, braking performance is poor and can easily lead to danger. It's recommended to check the booster pump and pipelines, and replace parts if necessary. Safety comes first—don't delay.