Rebuilt my front calipers

[_Sheffjs_]

I rebuilt my front calipers because I had one piston sticking on the right side. I was expecting a lot of goop when I poped out the pistons. Not so at all, it looked quite clean. Every thing moves good now.  Wierd!

[Icelander]

I haven't looked at my front calipers yet but on my car, the slider pins were quite often the culprit.

Hope this helps!

Kendall

[Hook#3287]

A got a set sitting on my bench waiting on parts.  I found the hardest part of that job is getting the Pistons back in by the new seals, even with a little fluid, you gots to get em just right.

[_Sheffjs_]

Slider pins were clean as well and it was clearly one piston so that eliminates the pins

[Ricky-D]

I rebuilt my front calipers because I had one piston sticking on the right side. I was expecting a lot of goop when I poped out the pistons. Not so at all, it looked quite clean. Every thing moves good now.  Wierd!

If you are using the appearance of the wear on the pads to conclude a piston was sticking, I think that would be a mistake.

Pads will wear unevenly because of the turning forces while you apply the brakes. This is especially more pronounced with smaller pads when compared to larger more expansive pads with greater braking surfaces.

The pads will wear more on the leading edge, and less on the trailing edge. This wear pattern will become more evident as the pads wear down.

***

[_Sheffjs_]

Nope! I placed a piece of wood in place of the disc and witnessed one piston barely move when the brake was pulled and then that same piston fought going back in all while the caliper was off the bike but hydraulic line still connected.  It was clearly one piston causing the emergency brake. 

[Cracker Jack]

I rebuilt my front calipers because I had one piston sticking on the right side. I was expecting a lot of goop when I poped out the pistons. Not so at all, it looked quite clean. Every thing moves good now.  Wierd!

If you are using the appearance of the wear on the pads to conclude a piston was sticking, I think that would be a mistake.

Pads will wear unevenly because of the turning forces while you apply the brakes. This is especially more pronounced with smaller pads when compared to larger more expansive pads with greater braking surfaces.

The pads will wear more on the leading edge, and less on the railing edge. This wear pattern will become more evident as the pads wear down.

***

I question whether either edge will wear more in a properly functioning caliper. My many years of experience says it doesn't. But if it did, I would expect that the trailing edge would wear faster.

[John Schmidt]

I rebuilt my front calipers because I had one piston sticking on the right side. I was expecting a lot of goop when I poped out the pistons. Not so at all, it looked quite clean. Every thing moves good now.  Wierd!

If you are using the appearance of the wear on the pads to conclude a piston was sticking, I think that would be a mistake.

Pads will wear unevenly because of the turning forces while you apply the brakes. This is especially more pronounced with smaller pads when compared to larger more expansive pads with greater braking surfaces.

The pads will wear more on the leading edge, and less on the railing edge. This wear pattern will become more evident as the pads wear down.

***

I question whether either edge will wear more in a properly functioning caliper. My many years of experience says it doesn't. But if it did, I would expect that the trailing edge would wear faster.

Actually, Ricky is right on this one. It's a matter of mechanics and I've noticed it many times over the years, especially on motorcycles. A good example is when riding a bicycle and you apply the front brakes and they emit a loud squeal. It's because the front is touching first causing the "chalk on a blackboard" sound/vibration. In that case, just slightly bend the bicycle's brake pad holder so the rear touches first; end of squeal!  It's also the reason many new pads on cars will squeal and the reason we add the goop(technical term) on the back to eliminate it. In that case you can't bend the pad mount, hence the use of anti-sqeal goop

[Cracker Jack]

I rebuilt my front calipers because I had one piston sticking on the right side. I was expecting a lot of goop when I poped out the pistons. Not so at all, it looked quite clean. Every thing moves good now.  Wierd!

If you are using the appearance of the wear on the pads to conclude a piston was sticking, I think that would be a mistake.

Pads will wear unevenly because of the turning forces while you apply the brakes. This is especially more pronounced with smaller pads when compared to larger more expansive pads with greater braking surfaces.

The pads will wear more on the leading edge, and less on the railing edge. This wear pattern will become more evident as the pads wear down.

***

I question whether either edge will wear more in a properly functioning caliper. My many years of experience says it doesn't. But if it did, I would expect that the trailing edge would wear faster.

Actually, Ricky is right on this one. It's a matter of mechanics and I've noticed it many times over the years, especially on motorcycles. A good example is when riding a bicycle and you apply the front brakes and they emit a loud squeal. It's because the front is touching first causing the "chalk on a blackboard" sound/vibration. In that case, just slightly bend the bicycle's brake pad holder so the rear touches first; end of squeal!  It's also the reason many new pads on cars will squeal and the reason we add the goop(technical term) on the back to eliminate it. In that case you can't bend the pad mount, hence the use of anti-sqeal goop

Not that it really matters, but my opinion has not changed because of your "explanation". I see no relationship of your "explanation" to the mechanics of this brake system relative to wear patterns. I agree with what you say concerning brake squeal.