Drcoffee

just a year after replacing the brakes including the calipers and the right rear pads are toast. The outer is completely worn to the backing plate. The pistons moved freely so it can only be the glide pins which were lubed well when installed. I dont get it.

Drcoffee

Photos attached

salimshah

Push back both pads and stick a thin ply on the worn side to make a block. Ask your assistant to apply brakes and see if thee non worn side moves.

Salim

maxSteel

Could also be caused by issues with the hardware

carguy07

Are the guide pins moving freely? The lower one that is part of the caliper gets stuck in mine all the time (even after recently replacing them). I also found that the green permatex lube was turning to glue after a while. Switched to silicone and it has helped a ton. But they still get stuck even when loaded up with lube and clean.

Drcoffee

I noticed that the bushing on the caliper doesnt move freely even when its fully lubed with silicone brake grease. The front/top pin moves freely. And I think you are correct, its the one on the caliper thats the problem.

salimshah

In my 18 years of ownership, I never lubed the glide pins. Just made sure there is no buildup (visually). Never needed to turn the rotors and the pad wear was equal. I did change brake fluid every 3 yrs. At the same time, the system was never subjected to bad environment [sand, snow, mud, chemicals].

Lube has a purpose, but at the same time it is a magnet for dust/dirt. I am not poo pooing lube, but it should be a very thin layer and the boots must be in perfect condition.

Salim

fastnoypi

i had the same situation on one of my rear calipers. The factory grease was almost non-existent and same accelerated outer pad wear. Cleaned and repacked with permatex green brake lube, the last couple inspections the pads are wearing even. Don't forget lubing the hardware where the pad "ears" slide back an forth on...that area can pick up dust and cake over time and create added resistance.

carguy07

You're in Texas

Drcoffee

the pins are not exposed to dirt and water. They are sealed by the rubber Boots. However the pins do get abused by rubbing back and forth and need some lube or they will start to rust and seize. I may have put in too much.

Drcoffee

Update:

My daughter was able to bring the beast home this weekend and I had a chance to break it down today. It wasnt too much grease causing the issue. I found that the rubber boots that seal the lower bushing/glide pin were manufactered too thick where they insert into the caliper. When the bushing was inserted through the hole, the rubber caused it to bind. So I used my dremel with a sanding drum to remove some rubber material from the inner circumference. Once it was clearenced, the bushing was able to move freely. Now the caliper will float correctly. Problem solved.

carguy07

Hmm, would love a pic of that.

salimshah

Do you have aftermarket boot?

Salim

Drcoffee

Rebuilt calipers on all 4 corners. I forgot to get pictures, sorry.

Drcoffee

The rubber boot I had to correct is the top middle boot in the picture.