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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?

Thanks!

  • Possible duplicate of What do I clean disk brakes with? – Cristian Ciupitu Oct 21 '18 at 1:30
  • @CristianCiupitu NO! We should close the other way around. The question you've linked has two very brief answers, whereas this question has a good, detailed answer. Closing this question will make that answer harder to find. – David Richerby Oct 21 '18 at 10:52
  • Also, the other question is about cleaning pads that are so heavily contaminated that they should almost certainly be replaced. This isn't a duplicate at all. – David Richerby Oct 21 '18 at 10:52
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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.

  • What about for end of ride cleanings, where you don't want to disassemble everything? Wipe the rotor with alcohol? Is it safe to use pressurized air to blow out the brake assembly where the pads are? – Christopher Pisz Jun 11 at 18:14
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To clean the pads, use high-grit sandpaper (400 or so). The best way to clean the rotor is with alcohol and a clean rag or paper towel, as that will evaporate and not leave a residue.

  • What do you use to clean the brake caliper body? – Benzo Apr 30 '18 at 17:55
  • Brake cleaner from the car trade, which is mainly alcohol. – Carel Apr 30 '18 at 18:35
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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.

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