Ok I need new calipers, all 4 need to be changed. How hard is it to do myself? Time isn't an issue, I've got all the time in the world. I just don't want to mess up my baby. I have a 2005 Maxima. Thanks

 

Haven't done it in years, most critical thing is bench bleeding each piston to get all the air out before you put it on the car. You still should bleed on car after each installed corner. I forget which you should start with first, but I want to say RR, LR, RF then LF...essentially start from the farthest from the master cylinder and work your way closer...

 

I may not have been perfectly clear, install one corner at a time, and bleed it before installing the next one. That will help you ensure you're not bleeding all 4 simultaneously...it can be a drag to have the whole system with pockets of air, and you just can't narrow down what the hell is going on...

 

Replacing the calipers is pretty straightforward. Main thing is to be patient during the bleeding process. Like madmax stated, start from the farthest corner and work your way closer. It is in the Haynes manual for sure (what i used as reference) and more than likely in the FSM.

 

you should call a garage, they will do it properly in 1-2 hours instead of you doing a ****ty job over 2 days.

 

If you are new to car repairs, brake system especially, don't even touch your brakes, leave the job to professional. If things go wrong, you may end up having almost no brakes, or no brakes at all when coming to a stop. Replacing calipers is quite intense job, requires proper flush and bleeding, also replacing rotors, pads, and new hardware (retaining clips, pins, and bushings) recommended. Properly done job involves a lot more than just replacing calipers, this is called major brake service and may cost quite a bit.