- Vacuum leak: If there is a vacuum leak in the brake booster, it can cause the engine to stall or hesitate when the brakes are applied. This is because the vacuum booster uses engine vacuum to assist in braking. When there is a vacuum leak, the engine does not receive enough vacuum, which can cause it to stall or hesitate.
- Fuel starvation: If the fuel pump or fuel filter is clogged, it can cause the engine to stall or hesitate when the brakes are applied. This is because when the brakes are applied, the engine requires more fuel to keep running. If the fuel pump or fuel filter is clogged, it cannot provide enough fuel to the engine, which can cause it to stall or hesitate.
- Electrical problem: If there is an electrical problem, such as a loose or faulty connection in the ignition system, it can cause the engine to stall or hesitate when the brakes are applied. This is because the ignition system is responsible for providing the spark that ignites the fuel in the engine. If there is a problem with the ignition system, it can prevent the engine from getting the spark it needs to run, which can cause it to stall or hesitate.
- Mechanical problem: If there is a mechanical problem, such as a worn or broken camshaft or crankshaft sensor, it can cause the engine to stall or hesitate when the brakes are applied. This is because these sensors are responsible for providing the engine with information about the position of the pistons and crankshaft. If there is a problem with these sensors, the engine cannot run properly, which can cause it to stall or hesitate.
