Hi ,
 
I'm driving my EV again after much thrashing around trying to solve the 
resonant frequency of the rotor-squealing. The anti squeal shims fixed the 
rotor squealing problem.  They’re part number 9500-4 by SBS (Scandinavian Brake 
Systems) stock #1702-0033.  You cut to size & peal,stick them on the back of 
the pads.  I also chamfered 1/8” 45 degree on the 4 sides of the pads per Samba 
recommendations and with an abrasive pad put swirls on the rotor both sides.  I 
used high-temp grease on the pads edges (did all this stuff before too but 
still squealed like a stuck pig).  So I think the stick on pads did it.
 
The Impulse 9" is showing noi wear on the brushes/comm after fixing the brush 
rigging (& timing set to neutral).
 
Best regards,
Mark                                      
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