What Causes a Car to Break Down on the Highway?

[LaDavid]

Here are the specific reasons why a car may break down on the highway: 1. Coasting in Neutral Gear: This increases friction in the gearshift mechanism and damages the transmission. When coasting in neutral with an automatic transmission, the difference between the driving speed and engine speed can lead to insufficient oil pressure in the hydraulic lines of the transmission, damaging the internal friction plates and eventually causing transmission failure, which may result in a breakdown. 2. Gear Grinding and Jumping: For automatic transmissions, shifting to P without fully pressing the brake. If the brake isn't fully engaged before shifting to P and turning off the engine, it can impact the transmission gears. Over time, this shortens the transmission's lifespan. For manual transmissions, forcing a gear shift without fully depressing the clutch can damage the transmission. Forcing the gearshift encounters resistance from the friction and collision between the rapidly rotating gear teeth, causing significant damage. 3. Fuel Pump Wiring Burnout: Fuel pumps rely on the fuel itself for cooling. If the fuel level is too low, exposing the pump, it may overheat or even burn out the wiring. Over time, this can significantly reduce the fuel pump's lifespan.