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Old 10-30-05, 08:04 PM   #1
jld3535
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avid mechanical disk brake noise

Has anyone else experienced brake squeal on the mechanical bb7's? Please help!!
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Old 10-30-05, 11:28 PM   #2
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first trying cleaning them. go get a can of brake cleaner at the automotive store and spray the rotehr and pads. mine squeeled with a couple of finger prints when I first installed them.
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Old 10-31-05, 12:35 AM   #3
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Originally Posted by steveknight
first trying cleaning them. go get a can of brake cleaner at the automotive store and spray the rotehr and pads. mine squeeled with a couple of finger prints when I first installed them.

No, no a THOUSAND TIMES NO!
How many ****ing times do I need to say / repost this?
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Reposted YET AGAIN because apparently some people STILL DON'T ****ing get it!
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The only thing
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(other than dish soap and water having rinsed VERY well afterwards) you should be using on BICYCLE ROTORS or pads is
DENATURED ALCOHOL


I swear every time we get some newb on here we have to go through this again.
Look at your owner's manuals people.
It says Denatured (some will say Isopropyl) Alcohol. It does not say: Automotive Brake Cleaner, or gasoline, or acetone, or even Moose Piss.
It says:
DENATURED M**********ING ALCOHOL
I prefer Denatured Alcohol due to the fact you know that everything in it is working for you rather than with drug store Isopropyl which is typically diluted with water which is useless in cleaning grease and oil

Bear in mind, this isn't about the rotor being affected, its the pads that you really need to take care of. Any chemical other than what the manufacturer suggests can and will have an adverse effect on performance and pad life
Products such as Copaslip or copper grease are also inadvisable do to contamination risks. Bicycle rotors don't generate enough heat to burn off these materials.
A heavily applied bike disc can excede 450 deg F. Trail riders doing anything more than cruising can reach 350+ without any trouble.
However, family car's brakes can hit up to about 600 degrees CELSIUS which is 1,112 degrees farenheit. Sports cars get even hotter so please: No car products on bike brakes.
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Old 10-31-05, 01:16 AM   #4
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Avid says only soap and water. but it sounds like it is more because if you use the wrong item you could contaminate the pads. so they don't give a bunch of things to keep it simple. does that mean they won't work? who knows has anyone tested it?
a simple test of cleaning the pads with one thing till the wear and keeping track of miles then cleaning with soemthing else keeping track of the miles and see if it makes a difference is the only valid way to really know.
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Old 10-31-05, 03:28 AM   #5
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Moose piss has been mentioned before.
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Old 10-31-05, 05:28 AM   #6
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Originally Posted by steveknight
Avid says only soap and water. but it sounds like it is more because if you use the wrong item you could contaminate the pads.
Which is exactly why you shouldn't use automotive brake cleaner on bicycle rotors
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Originally Posted by steveknight
so they don't give a bunch of things to keep it simple. does that mean they won't work? who knows has anyone tested it?
I've seen all sorts of stuff used on rotors. Why do you think I'm so adamant on the issue?
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Originally Posted by steveknight
a simple test of cleaning the pads with one thing till the wear and keeping track of miles then cleaning with something else keeping track of the miles and see if it makes a difference is the only valid way to really know.
I'm aware that the Avid manual says dishwater, however the rest of your statement is bunk. Any solvent other than alcohol can and often will leave a residue on the rotors. Also I'm not one to risk compromising my braking ability to prove a point.
Here's what the other major manufacturers have to say.

I champion Denatured Alcohol because it's a better solvent than Isopropyl (especially the crap they sell in drug stores) meaning you can use less and it retains all of the desirable attributes of Isopropyl.
The bottom line is if you leave a residue it's going to get on the pads which WILL compromise the braking ability and possibly the integrity of the pad itself. Denatured Alcohol is quicker, easier, and won't leave anything behind
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Old 10-31-05, 06:55 AM   #7
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Id put money on it your pads arent sitting square to the rotor and are toeing.......
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Old 10-31-05, 11:21 AM   #8
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Where do you buy Denatured Alcohol?
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Old 10-31-05, 12:10 PM   #9
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Where do you buy Denatured Alcohol?
Hardware store/HomeDepot/Walmart.

You can also get isopropyl alcohol in two strengths at Walmart. The cheap stuff is 70%, but there is a stronger concentration (90%+ I believe). Probably a little cheaper than denatured alcohol. Look in the medical supplies department.
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