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You need to have your flywheel: replaced.Your starter motor engages against the fly wheel at the back of the motor. Every time your motor stops it tends to be in the same few positions (just the way things work) so there is more stress on some parts of your fly wheel than others. Because of this the teeth wear out on the fly wheel which means the starter can correctly engage on the fly wheel which is the grinding noise.
The grinding noise when you are braking is worn out pads. Metal against metal is not good for your discs - replace the pads otherwise your up for machining of the discs or replacing. That noise on start-up is common with worn teeth on the fly wheel. The fly wheel will stop in "common" positions just how the momentum of the motor works and the teeth can wear out at these spots - sounds horrid but is not "unsafe" problem is one day you may not be able to start the car if the starter cannot engage the fly wheel to turn the motor over. This is where you hear of people turning the motor over a little by hand (they usually remove the stone plate from below the fly wheel to hand crank the engine) I don't recommend this practice probably better to price a replacement and while it is apart consider any other work eg. Clutch or minor seal leaks as it is not a small job to replace the flywheel.
It is either a bad starter or a bad fly wheel. What happens is the teeth of one or the other wear down. If you are turning the starter several times and it finally starts then you have a bad spot on your fly wheel. One way to check is to pull out the starter and look at the teeth on it. If it is your fly wheel it should be replaced but you will have some time. As the wheel turns you will probably not hit the bald spot on it that often.
The brushes on the starter are worn where you hear the gringing. The grinding comes from the worn areas trying to turn over the fly wheel. Or the fly wheel teeth are doing the opposite to the starter. Hope this helps
Does not sound normal. A bad solenoid in the starter is most likely the prob. If it makes a grinding sound, that is the starter crank shredding the teeth on the fly wheel. It will ruin the starter, and tear up the fly wheel a bit.