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Old 01-30-07, 01:08 PM   #1
coyboy
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adjusting brakes on 520

I went here

http://www.bike-manual.com/brands/tr...ing/index.html

but none of the pictures show up?

Anyways, I ride off the mountain almost daily on my training ride. I have noticed that my rear break does not have as much stopping power as the front. Best i can tell the pads are OK. I can mash the rear break lever down all the way but the front only about half way (in relation to the bar). I was looking for a quick guide on how to adjust it. It looks like i need to just take up some slack in the cable where it runs across the tire (connects both break pads). Is this about right?
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Old 01-30-07, 01:26 PM   #2
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http://www.sheldonbrown.com/canti-trad.html offered more advice but no picture of my brake. I just shortened the cable and that helped. seems like it is still centered and both sides are applying even pressure and both are still not touching whne let off. Headed out for a ride so I'll know soon if I really messed up.

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Old 01-30-07, 08:32 PM   #3
Michel Gagnon
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Do you have the "original" 520 with bar-end shifters and v-brakes, or is it a 520 that has been converted with STI shifters? And in the latter case, do you still have v-brakes with Travel Agents or do you have canti brakes?

If it's the original setup with v-brakes, I suggest you look at this page for information on centering and tension.

Look at the photo that has "Tighten screw to pull away". In particular, you might ease the tension in the brake lever by loosening the screws on both sides.

Also check for issues like cable binding in the brake lever or cable housing. One way to suspect a problem: if the brakes don't open quickly when you release the brake lever, then you have cable friction somewhere.

Finally, I learned once that, when standing at intersections, it's very easy to sit on the brake cable. It then is very hard to pull...
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Old 01-30-07, 09:08 PM   #4
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Quote:
Originally Posted by Michel Gagnon
Do you have the "original" 520 with bar-end shifters and v-brakes, or is it a 520 that has been converted with STI shifters? And in the latter case, do you still have v-brakes with Travel Agents or do you have canti brakes?

original setup.

If it's the original setup with v-brakes, I suggest you look at this page for information on centering and tension.

Thanks! I need to bookmark that site. looks like a good place to learn.

Look at the photo that has "Tighten screw to pull away". In particular, you might ease the tension in the brake lever by loosening the screws on both sides.

That looks like my brakes. I did not fool with the screw they are showing but i did move the cable over a little. This pulled the brake pads closer. I tried to check to see if it was still even. Seemed like it was. On my ride down the mountain it did much better

Also check for issues like cable binding in the brake lever or cable housing. One way to suspect a problem: if the brakes don't open quickly when you release the brake lever, then you have cable friction somewhere.

I dont think it is but I will check it next time I ride, maybe thursday.

Finally, I learned once that, when standing at intersections, it's very easy to sit on the brake cable. It then is very hard to pull...

hope nothing got hung whil you were pulling...
not sure how to reply to different sections showing quotes for each section. maybe this will come out ok my reply will be in the quoted part.
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Old 01-30-07, 10:20 PM   #5
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Cant explain the braking physics but I think you will always find the rear brake feels more "squishy" than the front. It probably has something to do with weight transfer. Your front brake is always gonna be stronger and is the one you want to use for "real" braking. I use the rear for more of a speed bleed, if that makes sense.
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Old 01-30-07, 10:44 PM   #6
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Quote:
Originally Posted by sth
Cant explain the braking physics but I think you will always find the rear brake feels more "squishy" than the front. It probably has something to do with weight transfer. Your front brake is always gonna be stronger and is the one you want to use for "real" braking. I use the rear for more of a speed bleed, if that makes sense.
not sure if it makes sense but it sure describes the feel of the rear breaks. I just expected both ends to feel about the same. Could be I really did not have a problem. But I like the feel of it better now that I tightened the back ones up a bit. And I was going somewhat by the feel of the breaks on the OCR. They were better on the back than the ones on the 520 and not mashing all the way down.

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Old 01-31-07, 06:42 AM   #7
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Quote:
Originally Posted by sth
Cant explain the braking physics but I think you will always find the rear brake feels more "squishy" than the front. It probably has something to do with weight transfer. Your front brake is always gonna be stronger and is the one you want to use for "real" braking. I use the rear for more of a speed bleed, if that makes sense.
Also the more cable, the more stretch. The read brake cable is significantly longer than the front brake cable.

-D
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