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99-04 Front calipers hanging up

2421 Views 22 Replies 6 Participants Last post by  superirish
What's with these things, seems to be fairly common that they drag, won't release all the way, or just plain get stuck. There's several threads on here of people having the same issue. Is the piston coating failing causing the phenolic to swell, or something else?
I've got them on two of my cars, and noticed how they both drag on one, so checked the other car, and found one drags, the other I can spin the wheel and it rotates a couple more times before it stops. With a beam style torque wrench on a lug nut it takes 12-15 foot pounds of torque to turn the rotor. I pulled the caliper, and blew air into the banjo bolt fitting and only piston came out, the other is stuck. I can rotate it, but that's all, can't get it to move otherwise, except to compress it with a c-clamp. Looks like I'll be going back to the cast iron 94-98 calipers.
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I bought steel pistons for mine. So far, 3 years, they're still working as expected. I'll have to go back & look through my notes for the part numbers, but I remember I got em from rockauto. It was like $46 for all 4 pistons, which is probably $146 in today's money.
Oddly enough they're cheaper now, I bought 4 of them, and it was under 40 for the pistons, and usual rock auto around $17 for shipping....:D:rolleyes:
and usual rock auto around $17 for shipping....:D:rolleyes:
I hate when I order an oil filter, cabin air filter, and engine air filter.....and they ship from 3 different warehouses. :rolleyes:
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I got the new steel pistons installed, wasn't terribly hard.
Found this article on phenolic pistons TECH: Why Are Some Brake Caliper Pistons Phenolic (Plastic)? - Safe Braking
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