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What are the reasons for brake failure when rolling back on a slope?

1 Answers

Luke

07/24/25 8:51pm

Rolling back can be categorized into stalling rollback and neutral coasting. The specific reasons are as follows: 1. Stalling rollback. Modern car brakes no longer use cables but instead rely on brake booster pumps. These pumps utilize the principle of air intake during engine operation to create a vacuum on one side of the booster pump, resulting in a pressure difference compared to the normal air pressure on the other side. This pressure difference is used to enhance braking thrust. When the engine stalls, there is no intake vacuum, and thus no boost, requiring significantly more effort to brake. During a stall, much greater force is needed to press the brake, creating a feeling of insufficient braking, which can be extremely dangerous in emergencies—increasing the danger coefficient by 200%. Without the assistance of the brake booster pump, pressing the brake can cause severe damage to the brake linkage, even leading to its fracture. 2. Neutral coasting. (1) Braking in neutral: When braking in neutral, the engine's speed cannot assist in braking, relying solely on the brake system for deceleration, which significantly reduces braking effectiveness and exponentially increases brake wear. (2) Long downhill slopes: On long downhill slopes, due to the high inertia of the vehicle, continuous brake pad operation leads to rapid wear, overheating, and softening, which are the main causes of brake failure.

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