I want to clean my disk brakes and am wondering if it is sufficient to only remove the pads and use water & soap when washing the parts.
If not, is there a list of stuff to avoid when cleaning disk brakes?
Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. It only takes a minute to sign up.Sign up to join this community
In most cases a mild bike wash soap gets you past the minor services, no problem. Used in conjunction with a toothbrush or the like.
What you want to avoid is any cleaner that is oil based(petroleum, paraffin etc.). These leave residue and will affect your stopping power. I have even found citrus de-greasers leaving residue films behind.
During major services you want to get the wheels and brake pads out after the normal wash. You can then use isopropyl alcohol to bush the caliper out. Isopropyl is also great if you found the pads contaminated and can often save the day from having to buy new ones. In addition, isopropyl is also used to wipe down the rotors' surface and that is very important to keep clean.
Isopropyl alcohol is cheap and easy to find, often branded as some type of household cleaner. So you can add it to the shopping list or swing past a chemist/drug store. In addition, if you are working on brakes, this should be part of your standard tool kit. It is the go-to for removing and cleaning DOT brake fluid of the bike as well. Also, when you go to the auto parts store, they will have brake cleaner as well. Usually more expensive and mainly pressurized isopropyl alcohol.
Avoid sandpaper. This is the very last resort. Unless experienced, you are almost guaranteed to get the surface not flat and out of parallel with the other side and rotor surfaces. This will decrease stopping power, cause squealing and require the pads to be re-bedded. So effectively you'll sand away some of the pad and the lose more trying to get it bedded again. Have used it in the past for very specific problems and then you'd be looking at 800+ grit, super flat working surface and circle motions.
I just used some oven cleaner spray (Great Value brand) on the brake pads while they were installed on my e-scooter. Then i stepped on my scooter and moved it a few times back and forth while pulling the brake. It seems like the oven cleaner helped to get rid of the contamination on the pads. The brake force instantly increased by at least 50%. I wiped the gunk on the brake disk off and rinsed the brake caliper with sufficient water in the shower. Tried a few more times using the brake and it seems like the brake force is still pretty good. will see if this lasts and how it will perform once i'm on the road.
So, on the whole disc and disc brake pads of your bike, brake fluid appeared (or worse, oily lumps), what should I do? With the disk, there will be no big problems. Most manufacturers of disc brakes recommend cleaning it with alcohol-containing material and a clean cloth. It's not a bad idea to clean the disk with a good hard coat. The easiest way is to simply take and wash the disc with water as the brake fluid dissolves in the water.