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Why is the brake not as responsive as before after the vehicle wades through water?

2 Answers

StMorgan

09/05/25 5:56am

After a vehicle wades through water, the brake may not be as responsive as before due to adhesion between the brake disc and brake pads, or rust on the fixed pins of the brake wheel cylinder. Below are the specific reasons for the reduced brake responsiveness: Brake fluid leakage: Insufficient or leaking brake fluid may result in the handbrake failing to hold. The braking system mainly consists of an energy supply device, control device, transmission device, and brake. The primary functions of the braking system are to decelerate or even stop a moving vehicle, maintain a stable speed for a vehicle going downhill, and keep a parked vehicle stationary. Thinning brake discs: Accompanied by body shaking or abnormal noises when braking, it is likely caused by thinning brake discs or foreign objects entering the brake pads. An uneven brake disc surface can produce sharp metal friction sounds when braking, and may also lead to insufficient braking force, longer braking distances, or a softer brake feel.

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StBrady

09/17/25 6:18am

I've experienced the issue of reduced braking effectiveness after driving through water multiple times. The main reason is that water enters the braking system, filling the gap between the brake discs and pads, which naturally reduces friction and makes the brakes feel spongy and ineffective. Water can also cause metal components to rust, and if the brake discs rust, the braking performance deteriorates further. After driving through water, it's best to drive slowly and apply the brakes several times to allow the water to evaporate and restore friction. Additionally, if water mixes with the brake fluid, it can dilute the fluid and affect pressure transmission, so it's important to check whether the fluid level is normal. Remember, if the brakes don't feel right, don't rush to drive fast—safety first. Find a place to stop and inspect the brakes or take the car to a repair shop. Driving through water can cause significant damage to car components, and regular maintenance can help prevent these issues.

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