Re: Uneven wear of pads and disk. YZF -R15

Uneven query approved.

Re: Uneven wear of pads and disk. YZF -R15

Mate, I don't know why this happened. But you are not alone. My R15 has the same problem too. I rarley use the rear brake but it seems that the rear brake pad are eaten off. Even the disc plate has lot some metal. I'm afraid whether the disc plate too needs to be replaced on my bike.And you said 19k is up on your bike, How did you manage to pull it without replacing the brake pads? Does the R15 brake pad lasts that long? I guess mine needs replacement at 10k cause I hear some screeching noise when I apply the brakes.

Re: Uneven wear of pads and disk. YZF -R15

I had a similar issue with the front brakes on my apache a few years ago. After getting the bike serviced, my brakes felt terribly spongy and were getting unevenly worn. It took me almost a month to figure out the problem.

I bled the brake system, changed the brake fluid but it didn't work. The service centre people told me that I needed to change the entire brake system (master cylinder, slave cylinder, brake lines the whole lot) and would cost up to 3000 rupees. But then I thought I'd try changing the brake pads (had spare brake pads lying around) and it worked! Upon inspection, I found that the service centre folks had put duplicate nissin pads, which were causing the trouble.

So try changing the pads. Keep us posted

Re: Uneven wear of pads and disk. YZF -R15

Looks like the brake calipers aren't working properly. Only the left one is being pushed to the disc. Get this checked asap.

Re: Uneven wear of pads and disk. YZF -R15

there can be multiple situations causing this. start with the basic ones.

wheel alignment. how often you check your chain slack ?
warp/bent rotor ?
real wheel bent (do you feel any wobble)

i believe the rear brake has single piston hence for me it looks like that when you release the brake the inner pad is not moving away from the disc causing the same.
when you press the pedal the piston pushes the brake liner over he disk on the other side. also the calliper moves freely over the rail which in the same pressure brings the inner pad also inside.

"brake calipers must be free to move in and out. Contact points are usually the two shoulder bolts that hold the caliper and the two resting surfaces (top and bottom) where the caliper meets the caliper support bracket. Everything needs to be free from any wear, rust, or dirt. After smoothing out any blemishes and cleaning apply brake grease to these points (bolts and resting points). Remove any excess grease so it doesn't get on the pads."

for reference please check below. ask the SVC guys to completely open the calliper clean it and also regrease all the upper joints on which the whole calliper assembly moves. and add new brake pads. that should do it.

Timely Topics -- Diagnosing Uneven Brake Pad Wear

Re: Uneven wear of pads and disk. YZF -R15

R15 pads shouldn't last this long in a properly working system. In my case, the rear brake felt spongy,dead from the beginning. So that helped the pads to last this much. Hope your problem will also get rectified by changing the pads.

The pads are genuine since they came from the factory. I too have bled the brake and to my suprise the fluid inside reservoir looked thick and dark yellow. 1 year old fluid shouldnt look like that I guess. Anyway, ill replace the pads and chek. Thanks

It seems. Will get it checked soon.

To start, the bike is just 12 months old and I adjust chain slack and tyre myself. The alignment is perfect and the rim has no issues. It doesn't wobble and the tyre wear is equal on both sides.
I've bled the brakes and thoroughly inspected the caliper which was free of dirt, rust etc. The piston is not stuck, it moves freely, it was my main concern.
Since there's nothing to do more, ill replace the pads and tell the svc guys to grease everything as you said.

Ill post the result here.
Thanks.



Sent from my C5303 using xBhp Connect mobile app

Re: Uneven wear of pads and disk. YZF -R15


i did not mean the piston but the whole calliper itself. when the piston presses one side of pad to the disk the whol calliper assembly also moves out putting equal force on inside pad as well hence you get proper braking and both side pads wear out equally. i assume the calliber assembly is not moving freely over those mounts hence improper wear and less brake force. ask them to open and regrease outer mounts and then fit calliper again.

make sure no grease touches the pad or the disc. it can account for total brake failure due to friction loss.

Re: Uneven wear of pads and disk. YZF -R15

Can someone suggest me a good mechanic who can take a look at Nissin rear disk brake and help me solve the Problem of drag?
Ever since the Service Center guy replaced the rear disc brake pad, the rear wheel feels jammed up. the bike is revving harder and top Speed has reduced.
i dont know what to do and the Service Center guy is completely stupid to even acknowledge that there is a Problem