Final answer:
A jake brake works by opening the exhaust valves near the end of the compression stroke in a four-stroke internal combustion engine.
Step-by-step explanation:
In a four-stroke internal combustion engine, the jake brake works by opening the exhaust valves near the end of the compression stroke. By doing this, it releases the compression pressure to facilitate braking. The jake brake, also known as an engine brake or compression release brake, is commonly used in diesel engines to assist in slowing down the vehicle without using the traditional braking system.