2002 GSXR Question...Hydraulic Engineer Out There?
09-19-2006, 08:03 PM
#1
Junior Member
Squid
Thread Starter
Join Date: Aug 2006
Location: Illinois
Posts: 12
2002 GSXR Question...Hydraulic Engineer Out There?
Thanks to the forum, I bought an '02 GSXR brake system on eBay and decided to take a progressive approach and test in steps to determine what I prefered.
After I got to step one, I noticed the intial bite was about the same as the two pot OEM Calipers, but as I increased forward speed and lever pressure of the six pot GSXR calipers w/ VTR master and rubber hoses - the braking got progressively potent. I thought I could progress to a stoppie, but stopped short.
My next step (2) is to change out the pads and add the stainless lines. I'm hoping for a little more bite and smoother progression in braking.
My question is "what will the GSXR Master add to the overall system as a final step?" My assumption is that total braking force will change little, but initial bite will improve dramatically and overall lever pressure will decrease.
Can someone confirm or refute this assumption?
Thanks
- Step 1: Put on GSXR Calipers with used pads, bleed & test
- Step 2: Add SS lines & new EBC HH pads, bleed & test
- Step 3: Add GSXR Master Cylinder, bleed & test
After I got to step one, I noticed the intial bite was about the same as the two pot OEM Calipers, but as I increased forward speed and lever pressure of the six pot GSXR calipers w/ VTR master and rubber hoses - the braking got progressively potent. I thought I could progress to a stoppie, but stopped short.
My next step (2) is to change out the pads and add the stainless lines. I'm hoping for a little more bite and smoother progression in braking.
My question is "what will the GSXR Master add to the overall system as a final step?" My assumption is that total braking force will change little, but initial bite will improve dramatically and overall lever pressure will decrease.
Can someone confirm or refute this assumption?
Thanks
09-26-2006, 06:48 PM
#3
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Squid
Thread Starter
Join Date: Aug 2006
Location: Illinois
Posts: 12
Update on GXSR Brakes
Well, I went to step 2...applied new EBC HH pads and Galfer SS lines.
Turns out the intial bite issue was probably the old pads which I bought with the GSXR calipers, MC and Lines. Now the braking is above OEM from the get go and quickly progresses to stoppie force.
The only issue is that the shop mounted the lines incorrectly (didn't follow Galfer's directions) and so we had a bommerrang vist to remount and bleed the lines.
I'm going on some extended testing this weekend, but based on the progress noted in Step 2, I don't think I'm going to install the GSXR MC.
Brakes are amazing already.
More updates later...
Turns out the intial bite issue was probably the old pads which I bought with the GSXR calipers, MC and Lines. Now the braking is above OEM from the get go and quickly progresses to stoppie force.
The only issue is that the shop mounted the lines incorrectly (didn't follow Galfer's directions) and so we had a bommerrang vist to remount and bleed the lines.
I'm going on some extended testing this weekend, but based on the progress noted in Step 2, I don't think I'm going to install the GSXR MC.
Brakes are amazing already.
More updates later...
09-26-2006, 06:58 PM
#4
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MotoGP
Join Date: Sep 2006
Location: Austin, Tx
Posts: 4,138
Very interesting!
I read your first post and it sounded like a great upgrade to the Super Hawk. I wondered at the time what size GSXR you pulled the hardware off of. I guess it stands to reason that you used the liter machine hardware but is it, in fact? I appreciate you posting your recent results because I wanted to go back to your original post to seee if you specified the size of the donor but didn't take the time to find it. Thanks!
09-27-2006, 09:59 AM
#6
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SuperBike
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Location: Atlanta, GA
Posts: 1,802
05 GSXR calipers won't work since they're radial mount. The overall consensus among industry journalists as well as racers is that the 4 pot Nissin calipers as used on the RC51, 929, 954, etc. are superior to the 6 pot calipers used on the 01 and 02 GSXR; the RC51, 929 and, especially the 954 consistently received rave reviews for their great brakes.
09-27-2006, 04:37 PM
#8
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SuperBike
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The 4 piston Nissin calipers used on the F4i, 919, RC51, 929, 954 have varying piston sizes, but all will bolt up with a little grinding on the caliper to clear the mounting bracket on the Hawk fork; other than color (some are black) they are externally identical.
If you search the archives you will find several threads on this topic, including one with clear pictures of what needs to be ground off the caliper to make it fit. If you have one in hand it's pretty obvious where and how much needs to be removed. I have F4i calipers and master cylinder on my Hawk, and while it's probably not quite as good as the 954 setup it's much better than the stock Hawk brakes. I think it took me less than half an hour to grind both calipers.
If you search the archives you will find several threads on this topic, including one with clear pictures of what needs to be ground off the caliper to make it fit. If you have one in hand it's pretty obvious where and how much needs to be removed. I have F4i calipers and master cylinder on my Hawk, and while it's probably not quite as good as the 954 setup it's much better than the stock Hawk brakes. I think it took me less than half an hour to grind both calipers.
09-27-2006, 06:18 PM
#10
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Originally Posted by CEDavisJr
2002 1000 GSXR, gold six pot. Direct bolt up. No grinding.
Test report next week.
Test report next week.
10-04-2006, 07:48 PM
#12
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Squid
Thread Starter
Join Date: Aug 2006
Location: Illinois
Posts: 12
Stopping at Stage Two - OEM M/C & SS
Took test ride of 300 miles this weekend through mid-Missouri.
Braking into corner felt very confident. Overall very good feel, perhaps 2x or more OEM braking power. Came over a hill and saw a John Deere and dog crossing the road. Apparently the farmer owns land on both sides. Went into panic stop and the front brake hustled down in a big hurry without hoisting the rear wheel in the air. very nice.
So I'm not going to stage 3 (changing out M/C) and staying with SS lines, 2002 1000 GSXR calipers and new EBC HH pads.
The only downside is that I thought I noticed a small amount of front fork flex in heavy braking. Maybe I should get a brace.
Thanks for everyones comments and ideas.
Chuck
Braking into corner felt very confident. Overall very good feel, perhaps 2x or more OEM braking power. Came over a hill and saw a John Deere and dog crossing the road. Apparently the farmer owns land on both sides. Went into panic stop and the front brake hustled down in a big hurry without hoisting the rear wheel in the air. very nice.
So I'm not going to stage 3 (changing out M/C) and staying with SS lines, 2002 1000 GSXR calipers and new EBC HH pads.
The only downside is that I thought I noticed a small amount of front fork flex in heavy braking. Maybe I should get a brace.
Thanks for everyones comments and ideas.
Chuck
10-04-2006, 09:32 PM
#13
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MotoGP
Join Date: Sep 2006
Location: Austin, Tx
Posts: 4,138
This sounds like a really good mod for the VTR. Thanks for keeping us in the loop. I'm starting to print the threads that I like for my bike. This way I don't have to go looking for them in the archives. Your mod is going into the file.
10-05-2006, 03:41 AM
#14
ole dirty bastard
SuperSport
Join Date: Jul 2004
Location: my house
Posts: 975
Took test ride of 300 miles this weekend through mid-Missouri.
Braking into corner felt very confident. Overall very good feel, perhaps 2x or more OEM braking power. Came over a hill and saw a John Deere and dog crossing the road. Apparently the farmer owns land on both sides. Went into panic stop and the front brake hustled down in a big hurry without hoisting the rear wheel in the air. very nice.
So I'm not going to stage 3 (changing out M/C) and staying with SS lines, 2002 1000 GSXR calipers and new EBC HH pads.
The only downside is that I thought I noticed a small amount of front fork flex in heavy braking. Maybe I should get a brace.
Thanks for everyones comments and ideas.
Chuck
Braking into corner felt very confident. Overall very good feel, perhaps 2x or more OEM braking power. Came over a hill and saw a John Deere and dog crossing the road. Apparently the farmer owns land on both sides. Went into panic stop and the front brake hustled down in a big hurry without hoisting the rear wheel in the air. very nice.
So I'm not going to stage 3 (changing out M/C) and staying with SS lines, 2002 1000 GSXR calipers and new EBC HH pads.
The only downside is that I thought I noticed a small amount of front fork flex in heavy braking. Maybe I should get a brace.
Thanks for everyones comments and ideas.
Chuck
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