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Shimano 5501 Brake Caliper Parts

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Shimano 5501 Brake Caliper Parts

Old 07-07-06, 03:19 AM
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Shimano 5501 Brake Caliper Parts

I just bought a set of Shimano 1-5 duali pivot calipers off ebay one was complete the other was missing all of the mounting hardware. The seller did not state this in the auction and has offered to pay for replacement hardware. What I want to know is what all I'm missing so I get the right things, so if someone has a spare set around they can compare with that would be great. The complete one I'm assuming is the rear it has a curved was a washer/spacer with teeth and two regular washers, and an allen bolt. So does the other one use the same parts it dosent seem like the curved washer would be compatible and must be different. Also how much of my money should I have him refund to cover the costs. Thanks.
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Old 07-07-06, 06:28 AM
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The hard parts to find are the radiussed washers, available here (scroll almost to the bottom and look for "BRH82"):


The center bolt is 6mm so you need a 6mm star washer and probably a couple of flat washers, too.

The "pivot nut" is another special piece. It is Item 4 in the diagram:


The good news is that when you buy a new front brake from Shimano, you get three different length pivot
nuts included to account for different thicknesses of front forks. The shortest of the three is 10.5mm in
length and is also the one you use for the rear brake. Most shops will have a stash of these pivot nuts
and you should be able to track one down easily, and cheap. You could also take the Shimano part
numbers into most shops and have them order the exact parts you need, but that's kind of overkill.
You could order the whole pivot bolt assembly (item 3 in the parts list), but the price is likely to be

It's important to keep in mind that those pivot nuts are designed to be used on a seat stay brake bridge that is designed (i.e. with a hole big enough to accomodate them) for a recessed pivot nut. Some seat stay brake bridges - especially older ones - have holes that are only wide enough to accomodate the
6mm pivot bolt. If that's your situation then you have a whole different problem. You'd need to completely replace the main pivot bolt with a longer one that goes all the way through the brake bridge and sticks out far enough to accomodate the radius washer, a lock washer, and a nut (nyloc nuts are good for this). Ok, to be complete on this I got out a pivot nut and measured it. You need an 8mm hole for it. So, this means that your rear seat stay brake bridge needs a hole (facing the rear of
the bike) that is slightly bigger than 6mm and a hole on the other side (closest to the seat tube) that is
8mm. That's what a modern Shimano rear road brake requires for mounting.

If the two holes are 6mm clearance then you have a problem. You either need to replace the main pivot bolt of the brake with long 6mm bolt, as I described above, or, very carefully open up the front hole
on the brake bridge to 8mm (to accomodate the pivot nut). It needs to be only just wide enough.
I have done this a couple of times on steel frames and it works fine, but I don't think I'd try it with an
aluminum frame unless I felt the brake bridge was really beefy. So, the first thing you need to do is
measure those two holes and see what you are up against.

If you can't find a 10.5mm pivot nut then PM me. I have unused extras, just as anyone who installs new
Shimano brakes does. There are not many forks that use the short nut (I've always ended up using
the long or medium length), so there are a zillion of those around. Best luck!
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Old 07-07-06, 02:32 PM
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That was really helpful...I just posted regarding a similar concern for spare parts...
Thanks cascade168!
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