Will it be hard to play with throttle brake after engine cleaning?

Cleaning the throttle has nothing to do with whether the brakes are hard or not.

The brake of your car has a vacuum booster, and its vacuum is operated by the vacuum generated by the intake pipe when the engine is running. Don't let go when you press the brake pedal. Start the engine. If the brake pedal feels sinking (about one third), the vacuum booster will be normal. If not, check the vacuum pipeline, which is a black circular device under the brake pump and connected to the pipeline of the engine intake pipe with a hose.

Because it is a vacuum tube, sometimes after cleaning the throttle or carburetor, the tube is folded or aged and sucked flat, which will reduce the brake hardening caused by the failure of the vacuum booster. Please refer to, good luck.