Hi guys,
I have a gravel bike that is 6 months old. Now it seems that there was some kind of metal between the disc brakes, which made my pads and rotor wear out. Now, I am asking myself if I only need to replace the pads or also need to replace the rotor, as there are some metal damage to the rotor. Can anyone help me?
by pieverfai
10 Comments
were you riding with your hand on the brake? 😀
Both the rotor and the pads need to be changed. The pistons also look kind of weird, especially the right one in the photo, so they could also be damaged and might need replacing. But that’s hard to tell from just the pictures. But rotor and pads 100%
You need to replace pads and disc and rebleed the brake if possible. That brake pads is gone…like very close to the piston. Your disc brake is also getting thinner and likely will wrap if you only replace the pads. So replace both!
Yes you should replace the rotor, they’re pretty cheap.
The rotor is toast, replace it and your pads asap or you’ll need a new caliper too. Good chance you might’ve cooked the seals already, wayy too much heat bud.
Dude, do you ever let go your brake lever ? Pads & disk are both long gone.
So, it appears everyone is in agreement that the rotor and pads are cooked. But let’s talk about how they got there; Do you often drag your rear brake to control speed on descents? Is the total of your weight + the bike’s weight + cargo weight significantly greater than 120kg? Is it possible that a piston in the rear caliper got sticky and frequently failed to retract? Is there a motor on this bike?
You have worn through your pads and your brake piston is wearing the rotor surface. There is also visible brake debris on your piston (the black gunk on the inner (right) piston on photo 3). You have let these brakes wear far too much without replacing the pads. At the least you need to replace your pads and rotor. You should clean your pistons and do a full bleed as I bet there is significant contamination inside your fluid (given how pushed out the pistons are).
You may need a new caliper entirely if that piston is damaged or the seal is damaged.
6 months!?! Damn dude. They need replacing. How many miles you have on there?
That disc doesn’t have wear, it’s well beyond dead. It is deceased. It is an ex-disc.