Hi All!

Hoping you can help me with your center pull knowledge....

Before I start, I tried Jan Heine/RH  but I think they are on light staff 
and I haven't heard back.


I've got a pair of direct-mount Herse center pulls on my Homer that I 
cannot, for the life of me, get the squeal out (rear only).  



Here's some things that I've done to try and eliminate the squeal and some 
general info.

1. There was some significant deflection of the stay under hard braking so 
I had a friend machine a brake booster. Now there is zero deflection. No 
change.

2.  I get squeal pretty much as soon as the pads touch the rim under any 
amount of brake pressure.  (Also, off the bike, using the brake lever 
engaging the brake and pushing the bike forward under very light pressure).

3.  Interestingly if I squeeze the pads by hand and move the bike forward 
in the same fashion, no squeal.

4. I must be dampening some kind of vibration in doing so?

5. Toe-in has been increased to the point it cannot be possibly be the 
issue? both pads are hitting at the exact same time, both pads are all the 
way "back" in the holder (closest to the arm)

6. I've taken a file to the brake pads to remove any contamination (any 
time I try something new I hit the pads with a file to eliminate them as a 
culprit)

7. I've cleaned the rims with alcohol (after every iteration of 
troubleshooting)

8. I've burnished the rims even though they are brand new Velocity Dyads 
(followed by righteous cleaning)  I've done this at several levels of 
"intensity"  


Anyone have any tips/tricks I can try?  

I'd hate to use a different pad because the Herse pads/holders are so 
beautiful but that's probably next on my list.

I haven't changed the straddle cable length or experimented with that yet.


Thank you so much!!!  This will make my month if I/we can figure this out...


Cheers,

Alex in Rochester, NY




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