Hardracer
Senior Member
- Joined
- Jun 11, 2017
- Posts
- 570
- Reaction score
- 619
- Location
- Swfl
- Ram Year
- 2010 1500 laramie 4x4 crew cab
- Engine
- Hemi 5.7
Yes sir you are correct in every way..Good thing you looked them over!
My guess is the former owner or dufus mechanic tried to get on one with a pliers (who knows why?), or tried to pry the caliiper and got on the piston ...and broke it. Chrysler uses phenolic pistons, which is like a bakelite "brittle" plastic. They have a stainless cap on them which contacts the brake pads ...so to the untrained eye it look like a steel piston. But they're not, and they'll crack if ya get on them with a pliers (I've done it).
It's actually a superior design. The SS cap gives some strength and robustness to the surface (SS is a poor heat conductor too). Phenolic pistons don't transfer heat as well too the caliper (less likely to overheat brake fluid), they won't rust or chip like a chrome-plated piston would (and do). It's possible it also lubricates the seal better too. Part's store calipers with chrome-plated steel-pistons are an inferior product IMO. But of course they work fine. Replacement phenolic pistons are avail through chrysler or RockAuto.
I popped the pistons out of our old '03 Jeep calipers last year just to see how they looked inside. They still look great! No problems, put them back together and good to go.
Glad you got your brakes figured out ...and it should be safer now![]()
I say what I thought due to that stainless insert had big ole circular gouge from what looked like the rivet thingy on the backside of the pad..