12-08-2019, 06:39 AM
welp, it's a fact. to review:
I have cleaned, scrubbed, acetone'd, and even 400 grit sanded the discs to see if cleaning them would have an affect. no luck.
I have swapped sides on the brake pads and disassmbled/re-assembled the whole thing with respect to how the front wheel goes on. no luck.
I have swapped back to the original brake pads, which still have *some* mileage left on them. no luck. still pulsing.
I have attempted the light test suggested above...inconclusive.
I have attempted the paper test suggested above, and discovered that on one of the rotors there's a spot where the paper gets a bit stuck and tries to pull forward with the rotation of the disc. this is the closest thing i have to direct confirmation that the disc is slightly warped.
I think from all this i can conclude that it's not the brake pads, it's not deposits on the disc, and it's not the assembly of the front wheel. That disc is just ever so slightly bent. i am immensely annoyed that it took this much work and time to confirm it. I'll have to just order another one and try it on both sides to see which one is the culprit.
Just to explore something i haven't yet had any way of testing: is there any chance that something could be wrong with the brake calipers themselves that could cause this pulsing-at-low-speeds problem?
I have cleaned, scrubbed, acetone'd, and even 400 grit sanded the discs to see if cleaning them would have an affect. no luck.
I have swapped sides on the brake pads and disassmbled/re-assembled the whole thing with respect to how the front wheel goes on. no luck.
I have swapped back to the original brake pads, which still have *some* mileage left on them. no luck. still pulsing.
I have attempted the light test suggested above...inconclusive.
I have attempted the paper test suggested above, and discovered that on one of the rotors there's a spot where the paper gets a bit stuck and tries to pull forward with the rotation of the disc. this is the closest thing i have to direct confirmation that the disc is slightly warped.
I think from all this i can conclude that it's not the brake pads, it's not deposits on the disc, and it's not the assembly of the front wheel. That disc is just ever so slightly bent. i am immensely annoyed that it took this much work and time to confirm it. I'll have to just order another one and try it on both sides to see which one is the culprit.
Just to explore something i haven't yet had any way of testing: is there any chance that something could be wrong with the brake calipers themselves that could cause this pulsing-at-low-speeds problem?