If you replaced the calipers, you must bleed the brake system to remove all air.
Be sure you mount the new calipers with the bleeder screws at the TOP.
You can use the old pump up and bleed method which requires having a person in the vehicle doing the pumping while you do the bleeding.
Before starting, make sure the brake fluid reservoir is **full of high quality Dot 3 or better brake fluid.
The person doing the pumping must understand how to do it,
1. pump it up until pedal feels firm,
2. then open bleed screw and allow fluid and any trapped air out of caliper while the pumper pushes the brake pedal down.
3. pumper holds pedal down while you close bleed screw.
4. pumper then pumps system up again until pedal feels firm.
**Recheck brake reservoir after bleeding each caliper!
5. repeat steps 2 - 4 until NO air is bleed from caliper. (may take 3 to 4 pump up and bleed for each caliper)
6. repeat this process at each caliber until NO air is bleed from bleed valve.
This is a good youtube video on how to bleed the brake system using the buddy pump up and bleed system:> https://www.youtube.com/watch?v=6DeuMPgQDrE
Second option is to purchase a one man brake bleeder similar to this one:
Motive Products 0113 Power Bleeder:> https://www.amazon.com/Motive-Products- ... B0119DBOJC
It applies a small amount of pressure to the brake system and allows you to bleed each caliper by yourself.
You will still need to make sure you keep the brake reservoir **full of brake fluid during the entire bleeding process.
If you let the reservoir get too low, you will force air in the brake system and have to start all over again.
