Off the subject front rotors - Wrist Twisters
 
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post #1 of 11 Old 01-07-2007, 11:20 AM Thread Starter
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Off the subject front rotors

A friend of mine rides a 1996 Suzuki GSXR-750. We just removed his front wheel to look for front brake problems. we noticed a good amount of uneven pad wear. he said the brakes are not at the top of thier game. we then checked the rotor thickness which looked to be in spec but the rotor moved a great deal both radially and laterally at the rivets. much more so than the rotors of my 9'er. Is this a problem that needs replacing or just common wear? will replacing the pads with new even pads solve the poor braking performance? My friend is pretty limited for financial resources and would like to find the most inexspensive fix. Any knowledge or references will be of huge value. Thanks everybody.

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post #2 of 11 Old 01-07-2007, 11:26 AM
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When it comes to brakes, "inexpensive" is not what you want to persue. How expensive can it get if (when) your front brakes fail?
The excessive play you mention is of the biggest concern. Be sure to have them looked at by someone familiar with what's what and don't skimp here!

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post #3 of 11 Old 01-07-2007, 11:32 AM Thread Starter
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I wish he could afford to do it all right. It just is not in his buget at the time. Would good condition used rotors be an alternitive to new?

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post #4 of 11 Old 01-07-2007, 02:19 PM
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Sure. If you locate a good set of rotors, you should be good to go (or stop!)
Offhand, I'd say there should be some good examples on e-bay resulting from an upgrade to wavy rotors.

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post #5 of 11 Old 01-08-2007, 12:35 AM
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Two things you don't do -- argue with a woman and trust marginal brake components. You haven't lived until you have had a front brake rotor separate from its carrier and lock up the front wheel at 160 (or even 30!) After all, what's more expensive -- two rotors or a funeral? I have bought used rotors on ebay before and always inspected them carefully before putting them into service, its usually pretty obvious if they're damaged / bent. Good luck.
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post #6 of 11 Old 01-08-2007, 03:43 PM Thread Starter
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Thanks for the help and the advice. I talked him into trying to find a set on ebay and it seems that a large amount of the gsxr family shared the same rotors for a number of years making them quite readily available. I also ordered him some new pads to try and get his stopping issues taken care of.

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post #7 of 11 Old 01-08-2007, 05:59 PM
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Quote:
Originally Posted by wisco919 View Post
A friend of mine rides a 1996 Suzuki GSXR-750. We just removed his front wheel to look for front brake problems. we noticed a good amount of uneven pad wear. he said the brakes are not at the top of thier game. we then checked the rotor thickness which looked to be in spec but the rotor moved a great deal both radially and laterally at the rivets. much more so than the rotors of my 9'er. Is this a problem that needs replacing or just common wear? will replacing the pads with new even pads solve the poor braking performance? My friend is pretty limited for financial resources and would like to find the most inexspensive fix. Any knowledge or references will be of huge value. Thanks everybody.
As for Radial & lateral movement. That's O.K. That's what Full floating rotors do. Well,... Good ones anyway. If they don't move they can't "float" & work the way they are intended to work.
The rivets are not there to hold the rotor firmly, But to hold the rotor loosely.
My Galfer Wave rotors, If pulled Laterally, Will pull off the rotor hub with minimal force. Radial movement also, About .010" ish.
All normal.
As for pad wear, Look into the calipers,puck alighnment/sticking,ect.

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post #8 of 11 Old 01-08-2007, 08:46 PM Thread Starter
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XRMikey The radial wear seams much closer to .150 than .010. I understand the principle of how the floating rotor works and cannot say that i have ever seen other rotors that moved as freely as these. I am concerned that these rotors could possibly fail in an emergency situation.
As far as the pads and calipers go I am some what confused by how erratically they are worn. I know the inside pads will wear different than the outside, but it appears to me that no pad in both calipers was worn simular to it opposite. i.e. inside left to inside right. Is there possibility that someone might have replaced 1 set of pads causing irregular pressures in the calipers?

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post #9 of 11 Old 01-08-2007, 08:57 PM
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Possibly, or the pads were removed & replaced in different positions, Resulting in a mismatched wear pattern. As for the Rotor. It's toast. It's just flopping around there. Rotors as worn as the ones you’re referring to can have different heat & stress issues that can wear pads at odd rates.

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post #10 of 11 Old 01-08-2007, 09:00 PM Thread Starter
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Thanks man. I thaught it best just to try it with all newer components.. If there is still a problem??? I will keep you posted as i get the parts.

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post #11 of 11 Old 01-08-2007, 09:15 PM
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Make sure to look over everything. Neglected brakes like those might bring up some unseen gremlins.
Change the caliper & rotor mounting bolts with New ones too. Don't reuse the hardware you take off.
They have a service limit, when met, they stretch & break. Good luck! Should be an easy fix for 'ya.

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