Touring - Adjusting Avid BB7's
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01-12-10, 06:36 PM
Anyone have a source for some clear directions on how to adjust and maintain Avid BB& disc brakes. Video would be great!! Found one source on The University of You Tube, but the guy rushed things a bit and really didn't capture some things on the video.
What is it you want to adjust, seemed kinda self explanitory. Is it getting the caliper lined up, or setting the caliper to the disc?
01-12-10, 06:59 PM
01-12-10, 07:06 PM
There is a pretty good explanation on the sram (avid) site, but here is a summary (from memory) assuming you already have cable length set correctly.
(1) Loosen the bolts that hold the caliper to the mount bracket.
(2) Hand turn both pad adjuster dials clockwise to tighten them against the rotor. Adjust back and forth until rotor is 1/3 from outside and 2/3 from inside (off center) in caliper slot.
(3) Tighten caliper mounting bolts to recommended torque setting
(4) Back off each pad adjuster about 3 clicks. Play around a bit to get minimal drag on the rotor but still have strong braking force well before lever is half way squeezed.
(5) As pads wear, take up slack by tightening pad adjuster knobs. Do not use cable adjusters to adjust for pad wear as that will screw you up.
I love my bb7s!!
01-12-10, 07:25 PM
Another thing I found that is probably obvious to everybody else is that before doing any of the above, make sure that your wheel is completely seated in the drops and the skewer is tight - before setting up your brakes.
I found the AVID directions confusing. Park Tool has an alternate, more lucid explanation.
01-13-10, 07:44 AM
The Park directions were great...thanks.
While I'm asking, does anyone else notice (on Avid BB7's) that the larger red pad adjusting knob (that controls the fixed pad) is much more difficult to turn by hand than the smaller red knob (controls the movable pad)? I need to use a wrench /socket/star socket to get the big knob to turn whereas the smaller knob turns easilt by hand.
01-13-10, 08:32 AM
The inner knob gets more easily gummed up. I have been too lazy to figure out how to clean it so it turns more easily. Obviously it is more difficult to adjust when the wheel is installed so figuring this out would be kinda nice. Maybe a flush with WD-40?
Oh, BTW another thing to do before installing even the wheel is to make sure the rotor is true. I know it's obvious, but I have made that mistake too.
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