Hello to all from Ontario Canada! hope everyone is enjoying the summer ! I have a question about front brake rotors. My 2016 cb had just under 20,000 km and I am in need of a set of replacement rotors. This will be the second set. I now have a brake vibe under moderate to heavy braking from highway speed. The first set were o.e.m replacements that were close to $800 cdn. That really hurt and I don't want to pay that again lol. I found a trw mst278 replacement , has anyone used these?
Thanks for any input
Brent
(on an unrelated note, my plastic headlamp bucket fell apart. I replaced it with a metal one and fitted it with a "trucklite" led headlamp)
$800C - yikes! Strange to be wearing/warping(?) through discs?
RE headlamp bucket: How did it fall apart? Fasteners just dropped out? Plastic disintegrated?
(07-22-2019, 12:18 PM)Captainwoot_imp Wrote: [ -> ]Hello to all from Ontario Canada! hope everyone is enjoying the summer ! I have a question about front brake rotors. My 2016 cb had just under 20,000 km and I am in need of a set of replacement rotors. This will be the second set. I now have a brake vibe under moderate to heavy braking from highway speed. The first set were o.e.m replacements that were close to $800 cdn. That really hurt and I don't want to pay that again lol. I found a trw mst278 replacement , has anyone used these?
Thanks for any input
Brent
(on an unrelated note, my plastic headlamp bucket fell apart. I replaced it with a metal one and fitted it with a "trucklite" led headlamp)
Have you personally, or had a shop, check the front rotors for lateral run out with a run out gauge? My front brake generate a slight amount of buzz and slight vibes occasionally, but until I re-tweak the Race Tech valving, I'll attribute my issues to front suspension that isn't dialed in properly.
As Ohiorider says, have a shop check the runout on the discs with a dial indicator. Only need to check the outside surfaces, no need to check both sides. This is common practice on car brakes, and could show only one disc is out of true. Absolutely no reason to replace both if one is good.
Back in the late-'70s early-'80s Suzuki and Honda big bike rotors would warp from hard use, and replacements were no better. We used to have a machine shop surface grind them, and they wouldn't distort again. I would rather pay to have them surface-ground than try new ones. There is a saying that a new part is an untested part.
More complete machine shops will have them - similar to a milling machine, but a grinding wheel is used instead of a rotating bit, and the surface is much smoother and more precise. The process is to grind the mounting surface first, the outer surface next, then the inner surface.
(A shop I used to work at had one, and they would also grind valve shims if they didn't have the right size)
I can't think of any reason short of impact that a rotor(or rotors) can get bent in normal use. I've seen discs galled and blued that were still straight.
If you had the wheels painted or powdercoated, the disc mating surface needs to be masked as well as the bolt holes.
I've had to replace both front rotors on my VFR800, (at separate intervals) but I have over 108,000 miles on this bike. I don't know how or why they got warped (I checked them myself with a dial indicator). Here's something to think about: Could a mechanic, who was replacing your front tire, have damaged them removing the old tire, or installing the new one? I always wonder this about my VFR.
(07-22-2019, 02:51 PM)Dave_imp Wrote: [ -> ]I've had to replace both front rotors on my VFR800, (at separate intervals) but I have over 108,000 miles on this bike. I don't know how or why they got warped (I checked them myself with a dial indicator). Here's something to think about: Could a mechanic, who was replacing your front tire, have damaged them removing the old tire, or installing the new one? I always wonder this about my VFR.
I've changed a lot of tires using different machines, and I can see there are many ways using one less than carefully can impact the disc. I can even see how a front wheel, just resting against something gets tipped over and could damage a disc.
(07-22-2019, 12:31 PM)GoldOxide_imp Wrote: [ -> ]$800C - yikes! Strange to be wearing/warping(?) through discs?
RE headlamp bucket: How did it fall apart? Fasteners just dropped out? Plastic disintegrated?
I will check the runout with a dial indicator to verify. The plastic headlamp just cracked in all directions from the fasteners.
Just as strange as my brakes.. Never had a bike do these things lol.
Still love the cb though!
Honda always uses steel flanged spacers on plastic headlight cases so the screw does not tighten against plastic. Was yours missing those? Just curious.
(07-23-2019, 01:58 AM)pekingduck_imp Wrote: [ -> ]Honda always uses steel flanged spacers on plastic headlight cases so the screw does not tighten against plastic. Was yours missing those? Just curious.
No nothing missing. When unbolted those spacers just fell out and bucket fell apart.
(07-22-2019, 12:18 PM)Captainwoot_imp Wrote: [ -> ]Hello to all from Ontario Canada! hope everyone is enjoying the summer ! I have a question about front brake rotors. My 2016 cb had just under 20,000 km and I am in need of a set of replacement rotors. This will be the second set. I now have a brake vibe under moderate to heavy braking from highway speed. The first set were o.e.m replacements that were close to $800 cdn. That really hurt and I don't want to pay that again lol. I found a trw mst278 replacement , has anyone used these?
Thanks for any input
Brent
(on an unrelated note, my plastic headlamp bucket fell apart. I replaced it with a metal one and fitted it with a "trucklite" led headlamp)
When new, the rear disk on my 2017 CB1100 EX dragged when I spun the wheel to wax the chain. I complained to my dealer about it and they said I must be riding with my foot on the rear brake. I told them I seldom use the rear brake, and I do not rest my foot on the pedal. They told me to use the rear brake more.
A month or so later the disk was discoloured from being over heated. Honda Canada had them replace the disk and brake pads under warranty. The rear brake still drags at a certain point when I spin the wheel, but it yet to discolour. I assume the rear discs on the new CB1100 EXs are warped from the factory.
To make things worse the Honda engineers placed the brake fluid cup under a frame brace so it is impossible to remove the cap without removing the cup. Morons! When I got my CB back the rear brake was mush and almost useless. Obviously the mechanics did not bleed the brake fluid.
The front brakes also squeal just before stopping, but at least they work.
Really annoying that a Honda motorcycle that cost me about $16,000 Canadian out the door has faulty brakes. The brakes on my $6800 CB500XA had none of these faults.
I tried the other Honda dealer who installed my new tires. But they ignored my request to check the rear brake and bleed the line. They also ignored my request for new spark plugs.
Too bad we now pay more money for poor service.