brembo upgrade not working out.....yet.

Take off CVO calipers
Take off master cylinder
11.8 rotors, fixed
Same wheel, axles and spacers

Here is the issue,

bolted every thing up and bled the brakes. Noticed lever was spongy and thought just needed more bleeding. Not so, notice the rotors where flexing near the caliper and the wheel was fairly tight to turn. Seemed odd, loosened both calipers exactly a quarter turn and bingo!! very firm lever and little wheel drag. The spongy lever was from the rotor flexing, but what gives.

Tried shimming the calipers, no luck there.
Can push all 4 pistons back, so nothing is stuck.
The calipers appear to centered at the pad boss and seem to be square to the rotor.
tried to narrow down to a single caliper by torquing one and backing one off, but they both are binding on the rotor.

seems as if the calipers are not square or loaded when torqued. that would give uneven pad wear and shouldn't load the rotors lie this.

Back off the bolts quarter turn and all is good..............any ideas??????

Thanks

 

Sounds like maybe some shims are needed.

 

Thanks, that doesn't seem to help. I would think some misalignment can be tolerated and lead to uneven pad wear, brake pull etc.

 

Is this an ABS bike?

 

Thanks for chiming in, no this upgrade to an 07 bike. Strange one seeing as this has been done many times.

 

Warped rotor( s); bad install of rotors; bad install of calipers; and/or bad pads.

Like many here, I did this swap a couple of years ago and it was a simple parts swap.

Look for a bad part or installer error.

Carl

 

Thanks Carl. Ya this should be a simple swap but this one is cursed. Lol

The pads are new as are the rotors. Run out is fine. It's acting like a 2 piston sliding caliper that is seized and trying to force the rotor over to meet the stationary pads......

 

I coudn't bleed the Brembo calipers and had a dealer tech do it

The spacers on my '04 were side-specific. Also, when installing the rotors I used new bolts, tightened them in a star pattern, and torqued them to spec.

Otherwise, I'm out of ideas. Hope you figure it out.

CaRl

 

Try swapping the spacers side to side. There is a difference. Also make sure the valve stem on the wheel is on the same side as the rear. That makes a difference too. Ask me how I know.

 

Can someone have a look at their calipers and tell me where the rotor sits in relation to the pad boss. Is it in the centre or off to the left or right.....would really appreciate it, thanks.