Since it's been a month I guess I may as well update everyone.
I replaced the driver side wheel cylinder and tried to bleed the brakes and then the offside cylinder started squirting like a girl that's taken viagra. Didn't have much of a choice besides changing that one as well.
The whole wheel cylinder removal process was a pain in the ass, when bolts/screws rust themselves onto something, they stick on real good. I had to cut off the wheel cylinder from the brake pipe and then very awkwardly straighted (because I ran out of length for the replacement fitting) said brake pipe. Also unsuccessfully flared the pipe (flare cracked) with the fitting on and then screwed everything back on real tight. The brake bleed was the biggest issue because the bleeding kit I bought was shite, so it took forever to do just the rear 2 brakes.
Right after bleeding the brakes, I took the car for a test drive and noticed:
A) Handbrake is tighter, 1 click holds the car on a steep slope easily (in the past I only got that effect after 4 clicks)
B) Very weak braking power in the rears
Issue B was the biggest problem, so I told my old man and he said give the brakes roughly 500miles to set it. Otherwise they're toast because they had brake fluid on them.
Obviously I'm a food delivery driver, so I covered the 500 miles quickly and can say the brakes slowly but surely have set in. Only problem is that they still aren't as efficient as they used to be, so there's a high chance I got brake fluid on them and therefore in the future I need to replace them.
With all things said and done, the engine itself definitely took a hit from the flooded road and was left with a couple bruises. Acceleration isn't as fast as it used to be and sometimes I can hear weird noises from it, so as a safety precaution I got break down cover.