Avid B4 pads, anyone? (Need Info)- Mtbr.com
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  1. #1
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    Avid B4 pads, anyone? (Need Info)

    I stocked up on what I assumed to be Avid C4 pads. After forking over the cash, I realized I was in possession of B4 instead of C4.

    A search of the archives reveals no info on the B4 compound. Anyone (Shiggy? Sparty?) know anything about these?

    <img src="https://gallery.consumerreview.com/webcrossing/images/avidb4.jpg">
    Last edited by f*nŠtik; 04-20-2004 at 07:00 AM. Reason: remove confusing info

  2. #2
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    I'm pretty sure that the letter/number designates the compound. The B4 compound was the compound that was stock on the Avids until they released the C4 compound.

    I believe that Tscheezy has commented on his results with both compounds. You might try the search function to see what his experiences were.

    -Ryan
    I stopped driving my bike into my garage - I'm now protected with Roof Rack Ranger app for my iPhone.

  3. #3
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    Quote Originally Posted by bikerx40
    The B4 compound was the compound that was stock on the Avids until they released the C4 compound.
    There was a B3 compound before the C4 compound, but I've never heard the B4 designation. The B3, if I recall correctly, didn't come with the spring clips. These do (no wear indicators, though, as indicated in the picture).

    Thanks anyway. I'll call Avid later today and share whatever info I can get.

  4. #4
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    Quote Originally Posted by f*nŠtik
    There was a B3 compound before the C4 compound, but I've never heard the B4 designation. The B3, if I recall correctly, didn't come with the spring clips. These do (no wear indicators, though, as indicated in the picture).

    Thanks anyway. I'll call Avid later today and share whatever info I can get.
    Oh, yeah it was the B3's that he had. Oh, well.... Let us know what you find out. Now I'm curious.

    -Ryan
    I stopped driving my bike into my garage - I'm now protected with Roof Rack Ranger app for my iPhone.

  5. #5
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    Avid??/

    WTF
    I bought Avid F&R and went on the first ride and was fine until the first water crossing. After that the front went away. By the time I finished the 6 mile loop I had adjusted both inner and outer on the front the whole way. I got home looked at them and they only had the metal left. I sent avid an e-mail about it and the replied by saying that a bad batch of pads had gotten out. They sent me 2 sets overnight. Not bad CS. I think ?? B4 was what was the problem, but can't remember exactly?

  6. #6
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    Gah!

    Quote Originally Posted by LititzDude
    WTF
    I bought Avid F&R and went on the first ride and was fine until the first water crossing. After that the front went away. By the time I finished the 6 mile loop I had adjusted both inner and outer on the front the whole way. I got home looked at them and they only had the metal left. I sent avid an e-mail about it and the replied by saying that a bad batch of pads had gotten out. They sent me 2 sets overnight. Not bad CS. I think ?? B4 was what was the problem, but can't remember exactly?
    Well, I got these directly from the Avid/SRAM guys at Sea Otter. 'Course, I specifically asked for C4 and that's what I expected, but once you hand over cash for a transaction such as this it's difficult to get it back. I didn't get to calling them today but I'll try to tomorrow to get an answer.

    For what it's worth, the packaging of my last C4 pads was printed (c)2001 on the back side, while these B4's all say (c)2002. But I don't think that means squat.

  7. #7
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    Good job! By the way, 5 chili's to Avid's Customer Service...

    By the way, 5 chili's to Avid's Customer Service.

    And, as always, I'd like to thank Keeley at Avid's Warranty Dept for her timely support & generous help (especially with those tiny parts, etc).

    Thank you,
    - PiroChu
    Last edited by PiroChu; 04-21-2004 at 10:39 AM. Reason: typo

  8. #8
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    Quote Originally Posted by f*nŠtik
    I didn't get to calling them today but I'll try to tomorrow to get an answer.
    Here's the skinny I got from Avid:

    Unlike the early days of the dualing ACP and UCP pads, Avid now officially only offers one pad compound at a time.

    The B4 pads are "it" but had some teething issues, but are back again. I'm not sure if they initially came before or after the C4's.

    The B4's are the replacement for the C4's, and have been available for a few months now. Whatever C4's are out there are old stock.

    The B4's have a reduced metallic content compared to the C4's. I don't know what issue that resolves.

    The "C" and the "B" designations supposedly have no meaning, i.e. no indication of pad composition or lineage.

    The *B3* pads that had the fast wear problem were not "pressure sintered". The B4's are pressure sintered, which is apparantly what is needed to keep them from wearing like butter pats.

    Avid has officially done away with the eyelet-looking wear indicators (as shown in the Cambria photo steve3 posted). Too many riders were bending them during wheel installation.

    No answer on the mounting bolt question. Neither Paul nor Keeley knew the answer, although Keeley says she's heard the question a few times now. Mike, their designer/engineer, is no longer around -- he'd have had the answer. Maybe the next person who calls will get an answer.

  9. #9
    No, that's not phonetic
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    It's funny but I liked the B3 pads better than the C4s. They were quieter in the wet and I never had them wear out prematurely. I'd get a good 8 months or more out of a set (1,000+ wet miles). They must have had a particularly bad batch once. I'm all for going back to that compound...

    tscheezy
    My video techniques can be found in this thread.

  10. #10
    "El Whatever"
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    I've always used B3 pads (came stock on the three Avids I've had). And I like their performance although I've heard those wear pretty fast in the wet. From the 3 brakes only one has gotten in the rain and survived pretty well. No fast wear, almost 1000miles and no signs for the need of pad replacement. In comparison, rear brake in the same bike is a shimano BR-M515-LA and I had to change the pads once.

    I guess the lesser metallic compound resolves the problem of brake squealing and may increase braking power a lillte (probably resins used have higher friction factor than metals I think) and sinterization makes for a more dense compound which should reduce fast wear. But I'd like to try one of those. I'd like to have a LBS where I could walk in and get the pads but I'm just dreaming for that to happen in Mexico.

    Any comprison between the C4's and B4's??

    Mounting Bolt??? What about that??? Never heard of the need of a mounting bolt for Avid pads....

  11. #11
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    Quote Originally Posted by Warp2003
    Mounting Bolt??? What about that??? Never heard of the need of a mounting bolt for Avid pads....
    Question came up in a previous thread about what grade bolts AvÝd uses for mounting the caliper.

  12. #12
    "El Whatever"
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    Is there any marks on the bolts head??? I haven't looked at them. If there are any marks we can now what grade is it. Obviously Avid buys those somewhere. My guess is those are grade SAE 5 but hard to know.

  13. #13
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    Quote Originally Posted by Warp2003
    Is there any marks on the bolts head??? I haven't looked at them. If there are any marks we can now what grade is it. Obviously Avid buys those somewhere. My guess is those are grade SAE 5 but hard to know.
    I forget how it came up, but no, there are no marks on the heads. AvÝd's two great tech guys, Designer Mike and Tech Support Lonnie are no longer with the company, and the guy Paul who is in there now (real nice guy) just couldn't find the info.

  14. #14
    "El Whatever"
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    Next time anyone call the guy ask for him to walk back to the warehouse and ask the Warehouse clerk what grade are those. He should know. Or even the guy at purchasing, or the QA/QC guy... well, I'm sounding like ranting now... but far from my intention... any guy at the shop might know.

    There's another way but requires investigation. If you know the torque, thread pitch (UNF??), diameter, head type and material is bolted to, you can go back to a torque table from SAE, ASTM or DIN (this DIN I seriously doubt) and find out the material of the bolt... but again... is easier to ask someone.

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