I just changed out my rear brakes tonight. No biggie, borrowed the tool from Autozone to do the job but as I changed the pads I was trying to figure out how they work. I've changed out the pads on several cars but have not encountered this type of piston before.
So, replace pads, turn the piston clockwise to compress. The piston has four impressions at the 12, 3, 6, and 9 o'clock positions on the face of the piston. The pads have a little raised bump on the lower portion in the middle. As I replaced the first pad, I realized I had to not only compress the piston but get the impression on the piston to line up with the raised bump. The caliper would not go on unless the divot on the piston was at the 6 o'clock position.
Do the pistons turn counter-clockwise as you push the brake? If they do, I don't see how they would turn as this little bump would prevent that. I am assuming there is a sleeve in the piston allowing it to move forward/back like the front piston and the clockwise/counterclockwise turning of the head would just be an adjustment of some sort.
Anyone understand the mechanics of this type of piston?
So, replace pads, turn the piston clockwise to compress. The piston has four impressions at the 12, 3, 6, and 9 o'clock positions on the face of the piston. The pads have a little raised bump on the lower portion in the middle. As I replaced the first pad, I realized I had to not only compress the piston but get the impression on the piston to line up with the raised bump. The caliper would not go on unless the divot on the piston was at the 6 o'clock position.
Do the pistons turn counter-clockwise as you push the brake? If they do, I don't see how they would turn as this little bump would prevent that. I am assuming there is a sleeve in the piston allowing it to move forward/back like the front piston and the clockwise/counterclockwise turning of the head would just be an adjustment of some sort.
Anyone understand the mechanics of this type of piston?