Your braking system is made up of two things:
This can sometimes be an indication that the stopping surface of your brake pads has "crystallized" and needs to be replaced.
A grinding noise is made by a piece of metal sticking through the stopping surface of your brake pad as it meets to metal rotor.
A sensation of uneven stopping that is most likely due to rotors that need to be machined or resurfaced.
When stopped, your brake pedal slowly descends to the floor instead of staying firm
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