Hi guys and gals I have a 77kz750 twin and im having issues with the rear brake rotor rubbing on the caliper bracket, not just a slight touch but making decent contact enough where the wheel will not free spin. I purchased the bike with this problem so i replaced all wheel bearings they are pressed in correctly, new seals, but problem still exists. I was almost thinking its bent but the bike would have to take a nasty fall not to mention the bracket is cast so i cant see it bending??? i have the spacers correct ive read the service manual 100 times and still cant figure it out, ive played with chain adjusters and the only way i can get it to not drag (as much) is to cock the wheel sideways by running out one adjuster further than the other. Could the bracket be twisted? Thanks for any help
77 kz750 Rear rotor dragging on caliper bracket? ***Fixed***
- Thread starter 77kztwinn
- Start date
Re: 77 kz750 Rear rotor dragging on caliper bracket?
It's hard to tell from that picture but it looks as if it is bent to the left at the top. Take it off and check it on a flat surface.
Does the caliper slide on its pins side to side and do both pads have enough meet left on them? And does the piston retract a little after you release the pedal?
It's hard to tell from that picture but it looks as if it is bent to the left at the top. Take it off and check it on a flat surface.
Does the caliper slide on its pins side to side and do both pads have enough meet left on them? And does the piston retract a little after you release the pedal?
Re: 77 kz750 Rear rotor dragging on caliper bracket?
Im going to take it off tonight after work and check it on a flat surface, I haven't installed the caliper yet, i have new pads in it and im just waiting for a new rear brake line so i dont know about the piston retracting.
Im going to take it off tonight after work and check it on a flat surface, I haven't installed the caliper yet, i have new pads in it and im just waiting for a new rear brake line so i dont know about the piston retracting.
Streetfighterkz
Been Around the Block
Re: 77 kz750 Rear rotor dragging on caliper bracket?
Check your wheel spacers. You could have the right two interchanged. Not sure how you would ever bend a bracket like that.
Later, Doug
Check your wheel spacers. You could have the right two interchanged. Not sure how you would ever bend a bracket like that.
Later, Doug
Re: 77 kz750 Rear rotor dragging on caliper bracket?
Looks bent -- yes, hard to tell from the pic. The bracket certainly can be bent. Generally very UN-advisable to un-bend it, especially being a primary brake component. Castings don't like to be deformed, and like even less to be forced to return to their original shape, so proceed at your own risk if you attempt to straighten it.
Looks bent -- yes, hard to tell from the pic. The bracket certainly can be bent. Generally very UN-advisable to un-bend it, especially being a primary brake component. Castings don't like to be deformed, and like even less to be forced to return to their original shape, so proceed at your own risk if you attempt to straighten it.
crazypj
Split personality, I fake being smart
Re: 77 kz750 Rear rotor dragging on caliper bracket?
Bracket is most probably bent, it's a very common problem when people 'cut corners' to 'save time'.
I've had probably two dozen Suzuki caliper mounts bent like that. Haven't found a decent spec to try and 'straighten' them though so they end up as scrap aluminium. it may be possible to salvage it if you first anneal it in oven at 400f for about 30~40 min
Bracket is most probably bent, it's a very common problem when people 'cut corners' to 'save time'.
I've had probably two dozen Suzuki caliper mounts bent like that. Haven't found a decent spec to try and 'straighten' them though so they end up as scrap aluminium. it may be possible to salvage it if you first anneal it in oven at 400f for about 30~40 min
Re: 77 kz750 Rear rotor dragging on caliper bracket?
Okay well I figured it out.. When I did the wheel bearings, the kit for the rear came with the one larger bearing for the rear hub...well I did the ones in the wheel but never changed that one because that one had no play, seal seemed ok..and of all honesty I was rushing to put the bike back together stupid me. It came with the kit why not just change it..so I took the 10 minutes and changed it, cleaned it up, put everything back together and what do you know..we have a free spinning wheel, no contact to the rear bracket whatsoever.. I'm still wondering why but changing that bearing solved the problem.
Okay well I figured it out.. When I did the wheel bearings, the kit for the rear came with the one larger bearing for the rear hub...well I did the ones in the wheel but never changed that one because that one had no play, seal seemed ok..and of all honesty I was rushing to put the bike back together stupid me. It came with the kit why not just change it..so I took the 10 minutes and changed it, cleaned it up, put everything back together and what do you know..we have a free spinning wheel, no contact to the rear bracket whatsoever.. I'm still wondering why but changing that bearing solved the problem.
Attachments
I had one GS750 rear wheel where the spacer between hub and sprocket carrier was missing and the wheel bearings were probably 1 mile or less from completely collapsing. The cages were distorted and snapped and balls were far from round. The PO dodged a bullet there.
That spacer MUST be in place between the sprocket carrier and wheel bearing.
That spacer MUST be in place between the sprocket carrier and wheel bearing.
crazypj
Split personality, I fake being smart
doc_rot said:
It's very very common to be missing on Kawasaki's, the sleeve fit is much 'looser' than most other manufacturers use so they fall out when carrier is removed (or stay on wheel hub then fall on floor when wheel is moved) It isn't a parallel spacer but has a tihnwall extension to fit into bearing reducing inner diameter
When I worked in Honda/Triumph dealer we kept a few in stock as they were almost almost missing when bikes came in for tyre changes or wheel bearing replacement because bearing 'just broke up'
One guy rode from Germany to airbase in South Wales (about 700 miles) with rear wheel loose about 500