Greetings BTOG Mechanics,
My first post here. I posted this same question about six months ago on the Kia forums but didn't get any responses.
I had to replace the rear brake pads and rotors on my wife's 2013 Kia Rio. This is the first time I worked on a rear disk brake system. I don't completely understand the internal workings of the calipers but figured out that the pistons screw in and out like some other rear disk designs I've read about on the internet. Different from the standard front disk design. I'm guessing that the screw mechanism operates the parking brake and acts as an adjuster. Then the hydraulics kick in for normal braking. Not at all sure though.
The backing plate on the original inside brake pad (against the piston) had a dimple that sits in a groove on the piston face. I'm guessing that this is to keep the piston from turning while the parking brake screw forces it out. I'm not sure about this though. There's a lot of resistance to keep the piston from turning just in the mechanism without the dimple though. But, like I say, I'm not completely sure I understand the construction of these things.
The backing plates on the pads I got from NAPA didn't have a dimple. I went to Advance and 4 out of 6 of the pads that they sold, including the super premium ceramic pads, didn't have a dimple. I put everything back together with the NAPA pads and it seems to be working as it should for about six months now. The brakes are solid and the parking brake holds.
Does anybody have any knowledge of the details of how these work? What is the purpose of the dimple? And why do some pads have it and some don't?
Thanks.
Nibbana
My first post here. I posted this same question about six months ago on the Kia forums but didn't get any responses.
I had to replace the rear brake pads and rotors on my wife's 2013 Kia Rio. This is the first time I worked on a rear disk brake system. I don't completely understand the internal workings of the calipers but figured out that the pistons screw in and out like some other rear disk designs I've read about on the internet. Different from the standard front disk design. I'm guessing that the screw mechanism operates the parking brake and acts as an adjuster. Then the hydraulics kick in for normal braking. Not at all sure though.
The backing plate on the original inside brake pad (against the piston) had a dimple that sits in a groove on the piston face. I'm guessing that this is to keep the piston from turning while the parking brake screw forces it out. I'm not sure about this though. There's a lot of resistance to keep the piston from turning just in the mechanism without the dimple though. But, like I say, I'm not completely sure I understand the construction of these things.
The backing plates on the pads I got from NAPA didn't have a dimple. I went to Advance and 4 out of 6 of the pads that they sold, including the super premium ceramic pads, didn't have a dimple. I put everything back together with the NAPA pads and it seems to be working as it should for about six months now. The brakes are solid and the parking brake holds.
Does anybody have any knowledge of the details of how these work? What is the purpose of the dimple? And why do some pads have it and some don't?
Thanks.
Nibbana