How do you push the piston back into the caliper when replacing the brakes on a MAXX LT.

That dooesn,t have to do with the proportioning vavle,The caliper is defective, Was not rebuilt properly like all the rebuilt (****) You get now a days,

try to get it overhauled..because might be it has gone jammed due to dust clottings......else get it replaced due to severe risks of brakes jams

On those brake calipers you need to turn the piston as you push the piston in. Of course, there is a tool for doing this. Using a C-clamp or a caliper piston tool, push the piston in, then with the other brake tool, turn the piston clockwise a turn or two, and then repeat with the C-clamp. Spraying the piston and seal with WD-40 will help in turning the piston to collapse it back into the caliper.

The problem lays with the Caliper itself and/or the brake hose connected to the Caliper.
However if you replaced the pads, did you also replace the Rotors or have them Turned? The old pads wear the rotor. New pads on old rotors that have not been replaced or turned may end with rubbing or stuck brakes.
A simple way to test whether it's one and/or the other:
1. Remove the Caliper from the rotor, remove the pads. Keep for now the caliper attached to the brake hose.
2. Very slowly push on the brake, exposing more of the piston out of the bore. Not all the way. Usually until the rubber dust seal/boot is fully extended.
3. Check the seal/boot for cracks and tears, and if clean or not. Bad seals may prevent the piston from re-seating.
4. Using a c-clamp and pushing straight in: Try repushing the Caliper Piston back into the Caliper Bore (the cup back into the hole). It should go back in realitively easy.
5. If it doesn't go back in easy: Again slowly pump the brake and re-push the pistons back out to full extended seal/boot (but not the piston out of the bore).
6. Detached the brake hose from the caliper.
7. Again using a c-clamp and pushing straight in: Try again to repush the caliper piston back into the bore without the hose attached. If it goes back-in relatively easy - the caliper is okay...it is the brake hose.
8. If the caliper piston does not go back in easily - Replace the caliper.
9. When Installing the new (reman) caliper, remember to bleed the brakes.
TRY EITHER OR #10 OR #11 BELOW:
After the new Caliper is reattached to hose and has been bled:
10. Again push on the brake petal to fully extend the caliper piston fully (rubber seal/boot fully extended) Again do not push the piston out of the bore! Try pushing the piston back into the bore. If it does not re-seat relatively easy: Replace the brake hose.
11. Another method: After replacing the new caliper back on the rotor: Assumng the entire front end (2WD front wheel drive) or entire vehicle (2WD rear wheel drive) or (4WD all the time) is jacked up off the ground
a. Put the lug nuts back on the rotor.
b. Have helper Start the vehicle and place in Drive. Don't step on gas!
c. Have then let off the brake and then engage the brake.
d. When they let off the brake watch to see if the Rotor is turning or not, if rubbing or not. Or if still sticking.
e. With a new caliper, turned or new rotors, and still a problem? It is the brake hose!
12. Replace the brake hose and try again.

Another method but more expensive:
OR Replace the calipers, brake hoses; bleed and test!

If this helped or not; or if you need additional help or have addtional questions let me know on fixya.com!

If you are replacing the rear pads and are trying to retract the caliper pistons here is what you need to do.
Use a piston installation tool in order to twist the brake caliper piston into the brake caliper bore.
If you do not have the tool you can retract the piston by using a needle nose plier.
Exert downward force and rotate clockwise until the piston bottoms out.
Before installing be sure the two "U" shaped slots are at 6:00 and 12:00 Oclock.

In order to retract the pistons on the rear calipers you need to use a special tool that will rotate the piston in a clockwise direction.It may be possible to try to use a strong needle nose plier.Apply force against the U shaped slots on the piston and rotate clockwise until the piston bottoms out.Before you reinstall the caliper make sure that the recessed slots are at 12 and 6 "o"clock..the slots align with one or two bumps on the inside pad.
If you are having problems with your calipers rebuilt one are a good option.If only the caliper slide pins are sticking they can be cleaned and lubricated.Pin lubricant sometimes comes with a set of brake pads.Other than that lube may be purchased separately at an automotive supply store.

Jack up the car and always put jack stands under it safty first. remove the tires. pull one caliper at a time. Use a 12 inch flat screw driver, Put it between the pads and the rotor. push it back and forth while putting down presure on the screw driver. When the caliper is pushed all the way in pull the caliper off the rotor. now put wood wedges, or you can use a c clamp. to hold the piston down. If you don't hold it down the piston will come out when you push the other side in. And you will loose all your brake fluide.Be sure to turn your rotors down.I sure hope this helps you. From your every day Brake Man 17 years at it.

the pistons have to be screwed back in place,I use a pair of needle nose plyers while applying constant pressure to piston.They can be rotated both left & right but you will notice soon which way pushes them in.

if there is a cable and spring attached to the caliper then it is the twist back kind. you need a special tool to rotate the piston back and do not force it. it will ruin the caliper. and also some cars one will turn clockwise and one will go counter clock wise i dont think this is the case with your car but if it doesnt want to turn back try changing the direction.

while the seals in the calipers are replaceable, its probably easier just to get a new/re manufactured caliper. if for any reason the seals don't work perfectly you could lose control of the vehicle when attempting to stop. with that said i'll try to explain the best i can how to replace the seals in the calipers for that vehicle.

1. jack up the front of the vehicle, place on jackstands and remove the front wheels, make sure the parking brake is on
2. unbolt the caliper and unbolt the brake line from the caliper and take caliper to a clean bench
3. remove the dust boot retaining ring on the caliper that holds the boot to the caliper itself
4. using a blowgun with a rubber tip apply low pressure compressed air where the brake line was bolted to the caliper to push the piston out of the bore (be carefull and ready because the piston may shoot out with some force)
5. when the piston comes out you will need to replace the dust boot and the seal so remove the boot and seal carefully so you don't scratch the piston ( the seal is actually in the caliper piston bore hole)and throw out the old seal and boot.
6. inspect all the surfaces and make sure there are no imperfections at all on the piston, the piston bore, or the caliper, if the surfaces are marred in anyway, replace the caliper, if they are good, using brake cleen and compressed air clean all parts then dry them
7. get the new seal and lubricate with DOT 3 brake fluid
8. install new seal into the caliper bore
9. apply a thin coat of DOT 3 brake fluid to the piston itself
10. install bottom half the the caliper piston into the caliper bore.
11. install new dust boot seal onto the piston
12. compress the piston to the bottom of the caliper bore
13. fully seat the dust boot seal into the caliper and install retaining ring
14. reinstall on vehicle (make sure to use a NEW copper washer on the brake line to caliper fitting) and bleed the braking system while checking for leaks.

repeat process for the other side.

if the caliper leaks at all from the piston after seal replacement, replace the caliper.

make sure you properly bleed the brakes before attempting to drive your car.

*these direction were extracted from personal experience and manufacturer information*

any other questions just ask!