Brake vacuum issue: If your car has a vacuum-assisted brake system, a leak in the vacuum line or a failing vacuum pump can cause the engine to stall when the brakes are applied. This is because the vacuum assist helps apply the brakes, so when there's insufficient vacuum, the engine has to work harder to stop the car, sometimes causing it to stall.
Faulty idle air control valve (IAC): The IAC valve regulates the amount of air that flows into the engine while idling. If the IAC valve is faulty or dirty, it can cause the engine to stall when the brakes are applied, as the sudden change in air intake can upset the engine's idle.
Fuel delivery problem: If the fuel pump or fuel filter is not delivering enough fuel to the engine, it can cause the engine to hesitate or cut off when you brake, especially when the fuel tank is low.
Transmission issues: In some cases, a problem with the transmission, such as a worn-out clutch or a failing transmission solenoid, can cause the engine to stall when the brakes are applied, as the transmission isn't able to handle the sudden change in load.
Electrical problems: A faulty ignition coil, spark plugs, or wiring issue can also cause the engine to cut off when you hit the brakes, as these components are crucial for delivering power to the engine.
If your car is experiencing this issue, it's important to have it checked by a qualified mechanic as soon as possible to diagnose and address the underlying problem.
