The motor revolution drop down when I brack the car

The engine speed goes low down quickly Yes the engine turn off while bracking The engine speed decreases during bracking when the car nearly to stop Thanks

Hello, You may have a defective brake booster, and this would cause a large vacuum leak. Try pinching off the vacuum line to the brake booster and pressing the brakes to see if there is any change. Please do this with the parking brake on, vehicle in park. Also, the torque converter clutch may not be releasing when the vehicle speed is decreased. This would likely be caused by a faulty torque converter clutch lock-up solenoid (TCC solenoid) in the transmission. When the TCC is locked, the engine and transmission are locked together, so stopping the wheels will stop the engine.