So you're very right about the 'independent diagnosis' part, I took it to my friend's friend to give me an independent diagnosis. It was the only way I learned which brakes (rear, front, both, or neither) needed to be replaced.

I am already trying to monetize by revenue-splitting.

So what happened was, when I went price shopping, I found 2 other friends who wanted their brakes fixed. So I got the idea of calling up shops and asking if they'd revenue split with me: if they'd give me 10% if I could refer them a customer on the spot. 3 of the 10 shops I called for that agreed and said they would. The others were hesitant but not fully against it. 2 were totally against it.

Then I also found a hobbyist mechanic with a home-shop who would do it better than market-price and profit split with me 50-50.

So all in all, I think if I compile comprehensive price list for my city, I could start directing customers for a cut.

What are your thoughts on this part?

Also, thank you so much for the response! I really appreciate it!