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Old 06-25-2011, 09:29 PM   #1
oldman650r
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soft front brakes

I jumped on my gsxr tonight for a ride , after it has sat for a few weeks the front brakes feel very mushy ,,, the resv. is full . the more i rode it got a lil better but not back to what it was before ,
Any ideas ??
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Old 06-25-2011, 09:30 PM   #2
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bleed it, sounds like you have air bubbles in yo lines
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Old 06-25-2011, 09:39 PM   #3
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Air Won't just get I'n lines, the fluid can be worn out n absorb too much moisture n require bleeding/flushed. Try that if you know how to properly. If not bring it to a professional( us at Motorcycles Unlimited would be glad to) and test again. Their is a possibility of the master cyl bad but I doubt it.
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Old 06-26-2011, 01:43 AM   #4
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Quote:
Originally Posted by camaroz2866 View Post
Air Won't just get I'n lines, the fluid can be worn out n absorb too much moisture n require bleeding/flushed. Try that if you know how to properly. If not bring it to a professional( us at Motorcycles Unlimited would be glad to) and test again. Their is a possibility of the master cyl bad but I doubt it.
Wait, air can't get in the lines but "fluid can be worn out and absorb too much moisture"?
Just curious, since you are a "professional" where does the moisture come from?
Sounds to me like air in the lines, maybe a seal went bad from sitting. As suggested try bleeding the brakes, it's a good way to get some fresh fluid in the lines. It DOES go bad over time, just not sure how moisture gets in but not air. lol
Anyway, as suggested if you are not sure how to proceed it might be best to have a pro look at it, since brakes are fairly important.
Motorcycles Unlimited has a Sterling reputation and they are a site sponsor so you can get all their info in the sponsor section at forum home.
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Old 06-26-2011, 02:24 AM   #5
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tie wrap the lever to the grip overnight and see if it's better. That allows any trapped air bubbles to migrate back up to the reservoir.
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Old 06-26-2011, 02:32 AM   #6
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Quote:
Originally Posted by bumblebee View Post
Wait, air can't get in the lines but "fluid can be worn out and absorb too much moisture"?
Just curious, since you are a "professional" where does the moisture come from?
Sounds to me like air in the lines, maybe a seal went bad from sitting. As suggested try bleeding the brakes, it's a good way to get some fresh fluid in the lines. It DOES go bad over time, just not sure how moisture gets in but not air. lol
Anyway, as suggested if you are not sure how to proceed it might be best to have a pro look at it, since brakes are fairly important.
Motorcycles Unlimited has a Sterling reputation and they are a site sponsor so you can get all their info in the sponsor section at forum home.

Brake fluid brakes down over time. And will absorb moisture.

Here is a good article:


This past January, the Motorist Assurance Program (MAP) established the first U.S. standard for brake fluid testing and replacement. MAP concluded that as brake fluid corrosion inhibitors break down, copper used in the making of brake line tubing begins to dissolve into the fluid and accumulate. While copper ions pose no immediate threat to system components they can be measured to reliably predict when brake fluid corrosion inhibitors become depleted. MAP established that when copper concentrations reach 200 parts per million (ppm), brake fluid has lost its capacity to inhibit metal corrosion and should be replaced. Although the fluid will still perform its primary job of stopping the vehicle, it can no longer fight corrosion among internal metal brake system components. This new guideline brings a new opportunity for service professionals to strengthen their relationships with customers. Every service professional knows the impact extended engine/powertrain warranties have had on business. Regular oil changes, annual winterization, and tune-upshave offered a regular and frequent opportunity for service technicians toinspect customer vehicles for needed service. The new MAP guideline on brake fluid service offers service departments the chance to recover a point of regular vehicle service to replace the once important engine tune-up.
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Old 06-26-2011, 02:37 AM   #7
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http://www.atlanticz.ca/zclub/techti...efluidinfo.htm


Moisture also creeps into the system to further add to the contamination problem
Humidity in the air can be drawn into the fluid anytime the fluid reservoir is opened for inspection or anytime a brake hose, line or bleeder valve is opened when servicing the brakes.
Even if the fluid reservoir is never opened, moisture will still infiltrate the system through microscopic pores in rubber brake hose.
The rate at which this happens depends on the age of the vehicle and the type of brake hose used.
Newer hose made with linings that are less permeable to moisture help extend the life of the fluid. Even so, moisture can still slip past piston seals in wheel cylinders and calipers.
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Old 06-26-2011, 08:09 AM   #8
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Well, I stand corrected, I had no idea that moisture could go through a brake line that can resist air. Thank you for the article, it was an interesting read.
I still don't understand how that happens, seems like if it can keep gas molecules from passing through it could stop water molecules.
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Old 06-26-2011, 10:02 AM   #9
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Quote:
Originally Posted by bumblebee View Post
Well, I stand corrected, I had no idea that moisture could go through a brake line that can resist air. Thank you for the article, it was an interesting read.
I still don't understand how that happens, seems like if it can keep gas molecules from passing through it could stop water molecules.
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Old 06-26-2011, 11:18 AM   #10
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crack the reservoir and zip the the brake lever to the grip overnight. might give you a bit more feel. i'll echo the rest though, flush and bleed the system.
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Old 06-26-2011, 10:27 PM   #11
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thanks for all the help and great article,
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Old 06-26-2011, 10:35 PM   #12
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I don't want to create YET another new thread.

My front brakes have started to chatter a little bit. Pads look good. Tires are a little iffy from a trackday. Any suggestions?
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Old 06-26-2011, 10:36 PM   #13
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Try bleeding it but I'd be willing to bet you lose pressure again in a couple of weeks.
The Nissin master cylinders on the GSXRs and the ZX bikes are junk.
Over time the seal goes bad and they will not hold pressure.
You can rebuild them but it doesn't last.
A cheap alternative was to replace it with the cast Brembo master cylinder off an R6 or R1 but they're becoming scarce. Another alternative we've had real good results with is the Braking master cylinder set up. They're around $220 but that's a lot cheaper than a forged Brembo and comes complete with brake switch and reservoir unlike the Brembo.
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Old 06-27-2011, 12:47 PM   #14
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Quote:
Originally Posted by NitroHonda View Post
I don't want to create YET another new thread.

My front brakes have started to chatter a little bit. Pads look good. Tires are a little iffy from a trackday. Any suggestions?
Your pads could be glazed over. i'd take them out and rub the surface on some concrete, scotchbrite your rotors, reinstall and see if the problem persists.
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Old 06-27-2011, 01:09 PM   #15
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I experienced brake chatter on my trackbike, pretty scary grabbing a handful at the end of a straight and having the front start shuddering. Really made me feel like I was gonna lose the front.
I tried everything. New pads, scotchbrite and brake cleaner on the disks. Checked steering head bearings, etc...

Turned out to be the forks were improperly adjusted.

I recommend you talk to, or go see Patrick at Motorcycles Unlimited. He really helped me out.
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