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Avid BB7 Problem :( !!!

864 Views 7 Replies 5 Participants Last post by shiggy, Dec 12, 2005

jamiedallow

Discussion Starter · Dec 11, 2005

Hi, Just been out in the garage sorting out my bike after riding at Llandegla today and pulled on the rear brake lever hard and heard a sudden snapping sound - level now moves all of the way back (until the cabel hits the stoper on the caliper) and the pad inside doesn't move at all, meaning i now have no rear brake, and was wondering if anyone has had this problem and if anyone could think what the problem could be. I havnt taken the caliper apart of anything its still on the bike, came in in a strop lol!
Thanks in advance
Jamie

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keen

· #2 · Dec 11, 2005

jamiedallow said:
Hi, Just been out in the garage sorting out my bike after riding at Llandegla today and pulled on the rear brake lever hard and heard a sudden snapping sound - level now moves all of the way back (until the cabel hits the stoper on the caliper) and the pad inside doesn't move at all, meaning i now have no rear brake, and was wondering if anyone has had this problem and if anyone could think what the problem could be. I havnt taken the caliper apart of anything its still on the bike, came in in a strop lol!
Thanks in advance
Jamie

How hard did you pull it / why ? It's bee a while since I took apart a BB7 but it uses grooved discs w/ ball bearings to move the outer piston. Best be pull it apart and see what broke.

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jamiedallow

Discussion Starter · #3 · Dec 11, 2005

keen said:
How hard did you pull it / why ? It's bee a while since I took apart a BB7 but it uses grooved discs w/ ball bearings to move the outer piston. Best be pull it apart and see what broke.

Pulled it with enough force to check that the cable was at a highish tension (could of pulled alot harder) and it suddenly snapped (the cable is stil perfect) do you happen to know if this would be covered under warrenty?

Thanks

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shiggy

· #4 · Dec 11, 2005

jamiedallow said:
Pulled it with enough force to check that the cable was at a highish tension (could of pulled alot harder) and it suddenly snapped (the cable is stil perfect) do you happen to know if this would be covered under warrenty?

Thanks

You need to take it to your LBS. They can call SRAM and see what they will do. They have been pretty good about replacing calipers. My LBS will pull a brake out of stock and get a replacement from SRAM.

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dogonfr

· #5 · Dec 12, 2005

Seems like the answers are the same. Any pics yet?

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AndrewTO

· #6 · Dec 12, 2005

jamiedallow said:
Hi, Just been out in the garage sorting out my bike after riding at Llandegla today and pulled on the rear brake lever hard and heard a sudden snapping sound - level now moves all of the way back (until the cabel hits the stoper on the caliper) and the pad inside doesn't move at all, meaning i now have no rear brake, and was wondering if anyone has had this problem and if anyone could think what the problem could be. I havnt taken the caliper apart of anything its still on the bike, came in in a strop lol!
Thanks in advance
Jamie

I'm having a hard time making sense out of your post (no offense!), but are you sure you set it up right? Maybe you didn't tighten the bolt that secure's the inner cable enough and now the inner cable moves without activating the brake? Perhaps the outer housing wasn't seated properly in one of the cable stops on the frame somewhere and now you've got too much slack in the cable to activate the brake?

Have you tried using your hands to move the caliper arm itself (not using the brake lever on the handlebar) to see if the pad moves? Give it a try and see what happens. It's a free test and might save you a trip to the LBS.

This is the first time i've ever heard of BB7 internal breakage. Anyone else?

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jamiedallow

Discussion Starter · #7 · Dec 12, 2005

AndrewTO said:
I'm having a hard time making sense out of your post (no offense!), but are you sure you set it up right? Maybe you didn't tighten the bolt that secure's the inner cable enough and now the inner cable moves without activating the brake? Perhaps the outer housing wasn't seated properly in one of the cable stops on the frame somewhere and now you've got too much slack in the cable to activate the brake?

Have you tried using your hands to move the caliper arm itself (not using the brake lever on the handlebar) to see if the pad moves? Give it a try and see what happens. It's a free test and might save you a trip to the LBS.

This is the first time i've ever heard of BB7 internal breakage. Anyone else?

No offence taken, im not exactly the most technical of guys lol! It was set up right yeh, its been working fine for 3 months, and the cable holding bolt was firmly in place and stil is where it was. Yep i've tried to move the caliper torque arm by hand and the pad doesn't budge almost asif the spring inside has snapped of come dislodged, as it is stil under warranty ive decided to contact CRC and they have said to send it back for investigation as it sounds asif something inside has cracked, snapped or become dislodged etc according to the guys there. Its the first time ive heard anything about a BB7 internal problem aswel, but i suppose now and again you will get the odd dodgy part wont you, im just glad it didnt happen while i was out on the trails. 1 thing i had noticed though was that i bought the rear and front (from differnet places admitidly) both brand new and the rear has the old style string pushing the pads apart and the front has the new style spring/clip which i presume is just due to the stock that was avaibable at the time. Its the first problem ive had with them, they've worked perfectly since i installed them and the pad wear is sensational compared to my old Shimano 475's which where a ***** to adjust as they had no inner pad adjustment (or outer can't remember which way round it is) and also flexed alot which i was not kean on especially when they had been set up by my lbs presumably correctly.

Thanks for the advice

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shiggy

· #8 · Dec 12, 2005

Avid use to warn against "stretching the cable" by pulling hard on the brake lever when installing the disc brakes (a common practice with rim brakes to "set" the cables and housing). It could damage the internal ramps in the caliper. Sounds like this is what happened to your brake.

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