Potential problem with brake lines?

this weekend we tried putting in my new mc after ive always had horrible brakes and still stock components with 4wd. the mc wouldnt work with my car, so we ended up just bleeding my brakes.

the rear of my car has always rattled and we never could figure it out until now. the rear brakes have never worked. there was no pressure there, so the rotor was rattling between the pads.

it took awhile but finally we got some fluid out of the lines. im wondering since my car has been like this forever, is it possible there was more then just air in the lines? should i look into this anymore?

now the rotors dont rattle anymore and it stops 100x better. just wondering if i should potentially check anything else or just watch meanwhile?

lastly, i need to disconnect my e-brake cables that are too short. they have been ziptied up since i got the car. i did some searches about disconnecting them. do you just use a 1/2" wrench and compress the bars like i read somewhat? any other tips?

thanks

that is what we did, we left my wheels on to do it though.

a decent amount got on the inner-part of the wheel and like 2 drips on the wheel. we wiped it off and i sprayed them when i got home. then cleaned the outer rim by hand with a rag so i should be safe.

i had never bled the brakes before, but i got the general idea of how it works. definately felt the difference afterwards, pedal is firm and car stops so much better. a little bit of dirt came out my cousin said and then alot of air. then fluid came after probably 3 minutes a side on the rear. i was moreless wondering if over a year of me driving it like that, plus however long with the previous deuche bag could cause any additional damage.

really unfamiliar with brakes, i know there is alot of pressure on those lines. so just trying to take any precautions now and get everything mechanically perfect on the car.