Brakes feel weak

Hey guys,

I have a 2001 Vert and been putting money into it to get it in shape.

I have had the wheel alignement and wheels balanced when i got the car back in summer 139km, currently at 140km.

Front tires are new, rears should be replaced end of this coming summer, they aren't good but not terrible either.

Problem im having is the brakes feel really weak and unsure. In rare occasion i do need to stop in a hurry they dont feel like they are going to get the job done and i would hit what im avoiding.

Brakes still have plenty of pad life all around, rotors are nice and smooth.
Wondering if there could be another issue.

I had to get the steering rack replaced back in Nov2010 because of a nasty pothole and wondering since i flushed that fluid would i need to do the brake bleeding as well seeing they are connected "hyrdoboost" or whatever?

im starting to think one caliper might be sticking because gas milege was bad 19L/100km and everything else is done for maintenance. Plugs,air and fuel filter, throttle body cleaned, maf cleaned.

Any ideas?

i was planning on getting around to bleeeding them before but temps dropped so much, too cold in the garage.

Ill give it a try this weekend. The car came with the aftermarket 20's bullit chrome wheels which im sure hinder brake performance totally on thier own.

But i haven't noticed the brake dust being excessive, but same time i wash the car every second week or so and probebly only drive 100km on average in that period.

next time im out for a drive ill check to see if the rotors get excessive hot. because its definately a new problem, when i first got the car i was getting 350km to tank driving hard, now like a grandpa im getting 200km at most.

what kind of brake fluid is recommended. dot3?