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It means it is time to have your brakes checked.
I would advise bringing your car to a mechanic as quickly as possible. Your brakes could fail. This puts you at a high risk for injury or even death.
Most common cause would be a loose brake caliper mounting bolts.
I hope you take it to a garage and have the brakes inspected. Might be a brake fluid leak.
A knocking sound while your car is moving is probably coming from the engine. A certified mechanic will be able to perform diagnostic testing.
you brake shoes might not be seated right, or they might need to be replaced i would take it to a jiffy lube of a just brakes and get them to go over your brakes
no
choppy and squeaky
a jaguar makes his sound by his throat and his tongue
A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
it makes a squeaky sound
squeak