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installing brake bolts(4 posts)

installing brake bolts_rt_
Jun 25, 2002 12:55 PM
i'm in the process of building up a new carbon OCLV trek 5200. when i installed the rear brake & put the bolt on i noticed that the bolt when tightened down was not flush with the frame. i removed the brake, took off all the spacers, and reinstalled. the bolt still is not flush with the frame & protrudes about 2-3mm. is this a problem? i'm assuming that it is not a big deal and is the result of the seatstay being narrower than average.

Bolts and nutsCalvin
Jun 26, 2002 4:35 AM
The brake caliper has a stud or bolt extending from the back. There is usually a spacer on this bolt. The bolt fits into the frame at what is called the "brake bridge". A long nut, called a sleeve nut, then screw from the other side of the bridge. The caliper brake bolt should not extend through the bridge. If there are very few thread engaged, spacers can be removed. If the sleeve nut bottoms out on the thread, it means the stud or bolt is too long. In this case, you may need more spacers or the bolt can be shortened.

In the image below, the dual pivot is on the left. The stud behind the arm is the bolt. The sleeve nut is not seen here, but attaches to this bolt.
re: installing brake boltscurlybike
Jun 26, 2002 8:17 AM
Do you mean the nut that has the 5mm hex hole in it? Remove the caliper and see if the nut goes any deeper in the bridge. It may be hitting the bottom of the nut counterbore. Some brake bridges require a washer with a radius cut in the back of it to wrap around the bridge for extra strength. This may be the case with you and the spacer would use up the distance you see.
sorry, meant the nut not the bolt_rt_
Jun 26, 2002 9:30 AM
my bad.

thanks for the info curlybike. i'll check on the washer.