mountain bike folks, question

Post by **tnf** » Mon Sep 05, 2005 7:45 pm

is it normal for there to bit a bit of noise coming from the front disc break when it is brand new? it sounds like the brake pads are just barely grazing the brake disc thingy (technical term) when riding. Nothing major, just a slight high pitched noise as the wheel spins. I've tried using the little adjustment knob, but am not having a lot of luck. the guy at the bike store said it would go away once the brakes were used a bit, but it is driving me nuts at the moment.

Post by **MKJ** » Mon Sep 05, 2005 7:46 pm

i think thats normal, a lot of handbrake-bikes do that.
bugs me too btw, so i never get bikes with handbrakes

Guest · Post by **Guest** » Mon Sep 05, 2005 7:55 pm

Semi normal, depends on how frequent and how loud it is. Mine did that a little bit at first and they scrape under tight or fast turns but otherwise they're completely silent, even when breaking.

Post by **Foo** » Mon Sep 05, 2005 8:09 pm

My back disc starts scraping if I accelerate heavily.

I just need to loosen off the back skewer and re-seat the wheel. Sometime I'll get around to sorting it out properly.

Try loosening your wheels, then setting them back into the forks.

Guest · Post by **Guest** » Mon Sep 05, 2005 8:15 pm

Yeah if you have quick release wheels make sure they're on there very tight. I was always told it should be so tight it's difficult to remove with your bare hands.

Post by **Foo** » Mon Sep 05, 2005 8:27 pm

Never get the problem from the front because it's bolted

Post by **[xeno]Julios** » Mon Sep 05, 2005 8:59 pm

try spinning the front wheel while holding the bike still. Does it spin freely?

Post by **blood.angel** » Mon Sep 05, 2005 9:17 pm

Attach some cardboard to the back wheel with a clothes peg so that it makes a clacking sound when the spokes hit it.
It'll make you look cool and sound like a real motorbike!

Guest · Post by **Guest** » Mon Sep 05, 2005 9:27 pm

You look like blue beard from that show american hot rod. God what an idiot.

Guest · Post by **Guest** » Mon Sep 05, 2005 9:28 pm

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Post by **l0g1c** » Mon Sep 05, 2005 9:30 pm

Not normal, have it adjusted. :icon25:

Post by **dzjepp** » Mon Sep 05, 2005 9:30 pm

Kracus wrote:You look like blue beard from that show american hot rod. God what an idiot.

lol yeah that's blue bird. He does look like him.

Guest · Post by **Guest** » Mon Sep 05, 2005 10:04 pm

tnf wrote:is it normal for there to bit a bit of noise coming from the front disc break when it is brand new? it sounds like the brake pads are just barely grazing the brake disc thingy (technical term) when riding. Nothing major, just a slight high pitched noise as the wheel spins. I've tried using the little adjustment knob, but am not having a lot of luck. the guy at the bike store said it would go away once the brakes were used a bit, but it is driving me nuts at the moment.

Well this is a common mistake many Cyclists do with their new bike.
You are supposed to rod it first, not going at more than 60 miles an hour for the first 50 miles.
Pete

Post by **Foo** » Mon Sep 05, 2005 10:08 pm

pete wrote:
tnf wrote:is it normal for there to bit a bit of noise coming from the front disc break when it is brand new? it sounds like the brake pads are just barely grazing the brake disc thingy (technical term) when riding. Nothing major, just a slight high pitched noise as the wheel spins. I've tried using the little adjustment knob, but am not having a lot of luck. the guy at the bike store said it would go away once the brakes were used a bit, but it is driving me nuts at the moment.
Well this is a common mistake many Cyclists do with their new bike.
You are supposed to rod it first, not going at more than 60 miles an hour for the first 50 miles.
Pete

Pete we're talking bicyclette not motocyclette

Post by **tnf** » Mon Sep 05, 2005 10:09 pm

pete wrote:
tnf wrote:is it normal for there to bit a bit of noise coming from the front disc break when it is brand new? it sounds like the brake pads are just barely grazing the brake disc thingy (technical term) when riding. Nothing major, just a slight high pitched noise as the wheel spins. I've tried using the little adjustment knob, but am not having a lot of luck. the guy at the bike store said it would go away once the brakes were used a bit, but it is driving me nuts at the moment.
Well this is a common mistake many Cyclists do with their new bike.
You are supposed to rod it first, not going at more than 60 miles an hour for the first 50 miles.
Pete

not going more than 60 miles an hour on my bike? ok pete I think I'll be able to handle that, even though I pedal pretty damn fast.

Post by **Foo** » Mon Sep 05, 2005 10:10 pm

was in my dads car a few weeks ago and we were tailing a road bike down a country lane.. he was doing 40mph comfortably. Got to a main road and he just went straight out into the road like there weren't any cars there, and merged right in. Crazy.

Post by **tnf** » Mon Sep 05, 2005 10:11 pm

I wish I knew more about bikes. I haven't had a new mountain bike since I was 14, and that was 16 years ago.

I rode a lot of BMX back in the day. Raced a bit. But the technology on the bikes now is crazy compared to what I remember.

Post by **Foo** » Mon Sep 05, 2005 10:14 pm

True, but you can safely ignore the nitty gritty of the tech. Bikes have always been very simple machines to get to grips with just by looking at them, and it's still true.

Post by **tnf** » Mon Sep 05, 2005 10:15 pm

yea, but my friend was asking if my shocks were dual dampened stacked dilithium power converters and i had no fucking idea.

Post by **Foo** » Mon Sep 05, 2005 10:16 pm

The correct answer is a half brick to his face

Post by **tnf** » Mon Sep 05, 2005 10:17 pm

it's not a bad bike i am guessing for what i spent at the shop, i didn't want to go too cheap and end up regretting it if i wanted more performance down the road...

Post by **Timbo** » Mon Sep 05, 2005 10:31 pm

Are the pads touching the rotor periodically, or all the time?

If periodically, and it doesn't stop the wheel in about 3 or less revolutions then it's nothing to worry about. The perfectionist in me would fix that anyway, by gently bending the rotor away from the pad it is touching. Small adjustments are best. Be careful not to get oil on the rotor, this is instadeath to disc brake pads.

If the pads are touching all the time, that's definitely something wrong. It depends on the design of the brake as to the cause, but reading your posts it sounds like a mechanical disc brake, maybe Avid? This works by having one piston fixed, while the other moves via a lever and screw. In order for this to work well, the fixed pad needs to be as close as possible to the rotor without actually touching it. It's possible that it is set a little too close. If it's not avid, or this doesn't sound like the problem, it's likely the caliper needs to be reset in some way so that the disc rotor runs between the pads.

Guest · Post by **Guest** » Mon Sep 05, 2005 10:43 pm

tnf wrote:
pete wrote:
tnf wrote:is it normal for there to bit a bit of noise coming from the front disc break when it is brand new? it sounds like the brake pads are just barely grazing the brake disc thingy (technical term) when riding. Nothing major, just a slight high pitched noise as the wheel spins. I've tried using the little adjustment knob, but am not having a lot of luck. the guy at the bike store said it would go away once the brakes were used a bit, but it is driving me nuts at the moment.
Well this is a common mistake many Cyclists do with their new bike.
You are supposed to rod it first, not going at more than 60 miles an hour for the first 50 miles.
Pete
not going more than 60 miles an hour on my bike? ok pete I think I'll be able to handle that, even though I pedal pretty damn fast.

Sorry it was a joke.
But believe me not...
I was with my cousin at the time we were like 14YO.
Descending the overpass my cousin who was in front of me got a ticket for going around 40 in a 35 miles zone.
PS; On an old bicycle.
Pete

Post by **tnf** » Tue Sep 06, 2005 12:00 am

Timbo wrote:Are the pads touching the rotor periodically, or all the time?

If periodically, and it doesn't stop the wheel in about 3 or less revolutions then it's nothing to worry about. The perfectionist in me would fix that anyway, by gently bending the rotor away from the pad it is touching. Small adjustments are best. Be careful not to get oil on the rotor, this is instadeath to disc brake pads.

If the pads are touching all the time, that's definitely something wrong. It depends on the design of the brake as to the cause, but reading your posts it sounds like a mechanical disc brake, maybe Avid? This works by having one piston fixed, while the other moves via a lever and screw. In order for this to work well, the fixed pad needs to be as close as possible to the rotor without actually touching it. It's possible that it is set a little too close. If it's not avid, or this doesn't sound like the problem, it's likely the caliper needs to be reset in some way so that the disc rotor runs between the pads.

I looked at it closely, spinning the wheel with the bike upside down and noticed that the disk rotor is actually a bit warped, you can see the exact same spot come into contact with the pads each revolution. Going to take it back to the shop and have them replace it.

Post by **Timbo** » Tue Sep 06, 2005 1:37 am

tnf wrote:I looked at it closely, spinning the wheel with the bike upside down and noticed that the disk rotor is actually a bit warped, you can see the exact same spot come into contact with the pads each revolution. Going to take it back to the shop and have them replace it.

I doubt they will replace it, they'll probably straighten it for you though. Out of true rotors are a fact of life with disc brakes. Unless it's very bad, it doesn't imply a manufacturing defect.

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