how many bottle of fluids will I need to replace front rotor? back rotor? both? and how much does it cost per bottle?? thanx

 

You don't need fluid if you are replacing the rotors.

 

even if you replaced all the fluid in the system it would probably be less than a quart, good fluid like Castrol GT LMA is about $5 a quart or $2.75 per pint bottle (better way to buy it if you're not using a lot at one time).

wdave

 

Unless you are removing a brake line or doing caliper work, you do not need to bleed the brake system. If you do need to, it's around $5 for large bottle of Valvoline Dot3/4 Synthetic brake fluid, enough to flush the entire system.