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The Quimby!
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Discussion Starter · #1 ·
G'day team :) . It seems that a common solution to the problem of under performing brakes is to sand the rotors. What grade or grit of sandpaper is the best for this task?

The front J5 on my Trance has okay power but feels very "wooden" towards the end of a stop. The rear J5 felt good and was very powerful but I accidently contaminated the pads with chain lube :mad: . Will sanding the discs possibly help in these situations?

I did not directly drop chainlube on the rear disc, but the disc ran through the pads about 2 or 3 days after I contaminated them. Should I also buy a new rear disc, or will sanding be the best option?
 

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conjoinicorned
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3,525 Posts
i like to sand my rotors and pads, i usually use 100 grit and leave the surface kinda scratchy. i find a good sanding makes up for a poor break in on new pads, also helps to clean the rotor and pads (if they aren't contaminated too deep, otherwise replace your pads)
 

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The Quimby!
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366 Posts
Discussion Starter · #3 ·
ferday said:
i like to sand my rotors and pads, i usually use 100 grit and leave the surface kinda scratchy. i find a good sanding makes up for a poor break in on new pads, also helps to clean the rotor and pads (if they aren't contaminated too deep, otherwise replace your pads)
Cheers Ferday, you sand the pads as well? Anyway, I will get new pads for the rear as they got a real soaking in chain lube.
 

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Jet-Mech said:
G'day team :) . It seems that a common solution to the problem of under performing brakes is to sand the rotors. What grade or grit of sandpaper is the best for this task?

The front J5 on my Trance has okay power but feels very "wooden" towards the end of a stop. The rear J5 felt good and was very powerful but I accidently contaminated the pads with chain lube :mad: . Will sanding the discs possibly help in these situations?

I did not directly drop chainlube on the rear disc, but the disc ran through the pads about 2 or 3 days after I contaminated them. Should I also buy a new rear disc, or will sanding be the best option?
Use isopropyl alcahol to clean your pads and rotors before you sand them, that just might do the trick. :thumbsup:
 

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Meh.
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17,508 Posts
If lube got on the pads, replace or torch them. Sand in figure-8 to resurface them. Even sand new pads to help break-in time.

Let's use our heads here. Why would you sand the rotor if the pads got contaminated?
 

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I wear two thongs
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1,675 Posts
I just contaminated a set of pads, I torched them and then sanded the pads and it got the brake back to about 90% power. I also cleaned the rotor throuroughly in some Rubbing Alcohol.
 

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The Quimby!
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366 Posts
Discussion Starter · #7 · (Edited)
G'day Tag1 / XSL_Will / Eric Hoefer. I just sanded the discs and pads on the Trance. The front brake has a whole new lease on life; it now has a lot more power and feel, so much so I almost went over the bars the first time :thumbsup: . Prior to the sanding treatment, the front brake never had anywhere near enough power to lift the rear wheel. The "wooden" feel has pretty much been completely removed as well :D .

A colleague recommended soaking the rear pads in kerosene to get rid of the chain lube. As soon as I dropped the pads in the kero, I immediately realised that it was probably not a good idea; with lube and kero both being oil based products :eek: . Anyway, I will get some new pads tomorrow, sand them and the rear disc (again) and see how they feel.
 

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I wear two thongs
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1,675 Posts
Jet-Mech said:
G'day Tag1 / XSL_Will / Eric Hoefer. I just sanded the discs and pads on the Trance. The front brake has a whole new lease on life; it now has a lot more power and feel, so much so I almost went over the bars the first time :thumbsup: . Prior to the sanding treatment, the front brake never had anywhere near enough power to lift the rear wheel. The "wooden" feel has pretty much been completely removed as well :D .

A colleague recommended soaking the rear pads in kerosene to get rid of the chain lube. As soon as I dropped the pads in the kero, I immediately realised that it was probably not a good idea; with lube and kero both being oil based products :eek: . Anyway, I will get some new pads tomorrow, sand them and the rear disc (again) and see how they feel.
Yeah Ive heard soaking pads when contaminated with another liquid is a bad idea it just spreads the contaminator more throuroughly throughout the pad, heating them up boils the oils and brings it to the surface of the pad so it can be sanded out.
 

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The Quimby!
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366 Posts
Discussion Starter · #9 ·
Eric Hoefer said:
Yeah Ive heard soaking pads when contaminated with another liquid is a bad idea it just spreads the contaminator more throuroughly throughout the pad, heating them up boils the oils and brings it to the surface of the pad so it can be sanded out.
I believe that I now have a very thorough lube oil / kero mixture evenly distributed throughout the entire brake pad material E Hoefer :eek: . In all honesty, I think I have made a complete meal of the rear pads. The only real solution is to buy a new set :rolleyes: .
 
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