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Sounds like a dragging brake pad. There is an adhesive that can be applied between the calipers and the pads. Or it may be time for a rear end brake change.
It sounds like you have a bad sensor, indicating the brake is engaged when it's not. Have you noticed if it tends to display the error when you go over bumps or turn sharply?
To address your first problem squeaking brakes aka "brake squeal", is most often casued by one or 2 things: "Pad vibration" or a "low brake warning sensor".
Pad vibation is usually caused by ineffective pad anti-rattling clips & hardware that allow the pads to vibrate at a super fast speed whenever the brakes are applied, thus causing a high pitch brake squeal. To correct this, replace all the pad hardware and anti-rattling clips and make sure you use a quality pad set that has anti-rattling plates attached to the backs of them. Weather conditions do affect brake squeal, that is why it seems to be worse at times.
Low brake warning sensor squeal occurs when your brake pads reach the point of replacement, the sensor attached to the pads scrapes on the rotor which produces a high pitch squealing sound to warn you it's time for new pads.
As far as your second problem goes (a knocking sound), I'll need more information about the problem before I can offer a possible cause (eg. happens on left or right turns, while going over bumps, at high or low speeds, accellerating...).
The squeal is not caused by the ball joints. A lot of times it is caused by the kind of brake pads put in there or the brake disk needs to be turned. Honestly you should take it to an ase certified shop who knows what they are doing.
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