When I brake on a road bike I feel staggered braking—similar, but much lesser in amplitude yet higher in frequency, to what you'd feel when ABS brakes engage in a car.
When I brake on an MTB, I sometimes hear a grinding noise, as if some pollutant occasionally interferes with braking.
For both problems, it appears that disk brake pads and/or rotor cleaning may solve the issue.
What is the right procedure for cleaning disk brake pads and rotors? The distance ridden is 250 and 500 km, and so replacing either part is almost surely wasteful.
- Will isopropyl alcohol (using the large supply of left-over disinfectant?) remove the brake pad material from the rotors, before restarting the bed-in procedure?
- Is there a tell-tale sign that a rotor has been ruined beyond repair?
- Does the pin holding the brake pads in place sustain multiple bendings back-and-forth, or do I need to have a supply of new pins for replacement?
- The rotors are perfectly true.
- Braking power remains perfectly fine.
- The gaps are just right and need no adjustment.
Update(Update following Jeff's and Renaud's answers)
Can you confirm that staggered braking is normal? All (?) rotors have holes. How these holes do not act as an abrasive material that rapidly shave the surface of the brake pads is a mystery, but is a separate issue. Yet I have only felt staggered braking on this one bike. Does it eventually go away? Chamfering of the holes is surely not done at the factory; could chamfering be done by users using the brake pads while braking, and then the staggering will fade away?