These aren’t the questions you should be asking if you’re going to service your own brakes. I’m concerned that your lack of knowledge means you won’t know if you are doing sub par work or if you are glossing over other issues.
It’s like if you were asking about doing some home wiring and trying to save money by asking if wire nuts were absolutely necessary, or if you could just twist the wires together by hand.
Specifically about your question,
1- that rotor is in terrible condition. It absolutely needs to be replaced.
These aren’t the questions you should be asking if you’re going to service your own brakes. I’m concerned that your lack of knowledge means you won’t know if you are doing sub par work or if you are glossing over other issues.
It’s like if you were asking about doing some home wiring and trying to save money by asking if wire nuts were absolutely necessary, or if you could just twist the wires together by hand.
Specifically about your question,
1- that rotor is in terrible condition. It absolutely needs to be replaced.
2-