Took the rear calipers off and the compressed together. How do i get them back on?

 

is there something/word missing, or did you take english lesson from Tonto?

 

Retract the pistons.

 

either crack the bleeder valve or loosen the master cylinder cap though

 

Not sure, but I think I understand what you're saying.... Go buy a 7in.(minimum) C-Clamp, and GENTLY compress the piston into the housing until it bottoms out. Making sure to CENTER the ''movable jaw'' within the piston, and the ''fixed jaw'' on the outside of the caliper, CENTERED as well. Remove the cap on the brake fluid reservoir BEFORE you do this, as stated above. Tighten the clamp little-by-little and you will see the piston go back into the cylinder. This will allow you to re-install your pads.

 

Probably best NOT use the words "bottom out" when explaining a basic procedure since it's clear OP has little experience in this area.

Use a small wood block (or at least a thin plywood if the pistons are in full extension and space is a premium) over the WHOLE piston surface (and the outside of the caliper to avoid marring the surface unless you don't care) to distribute the clamp load across the whole diameter THEN compress until the piston is retracted enough to re-insert your pads. If new pads, that probably means all the way back to FLUSH with the caliper surface NOT "bottomed" in the piston cylinder.

And yes, open the master cap(s) and place a rag underneath to avoid any fluid overflow onto other parts. (Didn't think any of this really needed to be said...)

I know what you meant, Atreyu'z, but just to be on the safe side for the OP's benefit since schools don't offer Auto Shop 101 any longer it seems.

 

Thanks, Mic. He probably won't understand a couple of your words either.

 

https://www.harborfreight.com/disc-b...sor-68973.html

 

Jeez, there ya' go. The proper tool for $8.. I'm so old school sometimes. :-