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Poor brake performance(3 posts)

Poor brake performanceteamacco
Sep 9, 2002 5:04 AM
Im having trouble with noise and stopping ability. I have Ultegra brakes and Mavic CPX 21 rims on my newer bike that make an annoying grinding noise on and off. Always on a long decent when applying the brakes hard at the bottom it sounds like 60 grit sand paper grinding the rims, I put the brakes on and off and sometimes it clears up a bit. I clean the rims and pads after every 10 or so rides and they work ok for a short period. My older bike has ceramic rims, Mavic GL330, that never made these noises. Is this common with nonceramic rims, or are these rims cheaper than other rims?
re: Poor brake performanceEric_H
Sep 9, 2002 10:35 AM
No, it is the Shimano pads. Shimano has 3 types of pads - standard, high performance, and cork (for carbon). My guess is that you have the "high performace" pads. They suck. They are very soft and pick up regular road debris very easily, thus creating the grinding noises. The "standard" Shimano pads are better in this respect.

If you want the best braking power, I recommend the Kool-Stop pads. I've been using the dual compound (salmon/black) pads on Dura-Ace 7700 calipers on my race bike and I have the "standard" Shimano pads with Ultegra 6500 calipers on my 2nd bike and the difference in stopping power is quite remarkable. The Kool-Stops rule.

Branford Bike (www.branfordbike.com) sells the pads and pad holders, plus a spare pair of all-salmon pads, for around $25. The Kool-Stop pad holders are an upgrade from Shimano because they have elliptical washers that allow for proper toe-in. Highly recommended.
re: Poor brake performanceteamacco
Sep 10, 2002 11:04 AM
Thanks, I think I'll try the koolstops.