Why your car stalls at idle speed when brakes appiled?

A car may stall at idle speed when the brakes are applied due to increased load on the engine, which can happen if the idle speed is not properly adjusted. Additionally, a vacuum leak, faulty idle air control valve, or issues with the fuel system can disrupt the air-fuel mixture, causing the engine to struggle under the added strain. If the engine is not receiving enough power to maintain idle, it may shut off. Regular maintenance and diagnostics can help identify and resolve the underlying issues.