why are my front brakes so stiff - 600R : Yamaha R6 Forum: R6MessageNet : YZF-R6 Forums
 
» Insurance
» Sponsors
» Yamaha YZF R6 Prices
Go Back   R6Messagenet.com > Community > General Motorcycle Talk

Reply
 
LinkBack Thread Tools Display Modes
Old 10-01-2006, 03:05 PM   #1 (permalink)
Senior Member
 
cookiemonster's Avatar
 
Join Date: Jul 2005
Posts: 117
Feedback Score: 0 reviews
cookiemonster's Garage
Default why are my front brakes so stiff - 600R

My front brake lever is way too stiff, even on the highest number setting. I just flushed the front brakes. Currently have stock lines, pads and dot 4. The highest setting is just slightly less stiff than the lowest on the brake lever dial. Basically a little squeeze feels like slamming with full force. The bike is a 96 yzf600
cookiemonster is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-01-2006, 03:54 PM   #2 (permalink)
Huge "Member"
 
rb4123's Avatar
 
Join Date: Sep 2006
Posts: 392
Feedback Score: 0 reviews
rb4123's Garage
Default

Did you overfill the resirvoir? Check the master cylinder too for foreign objects in the valving.
rb4123 is offline   Reply With Quote
Old 10-02-2006, 08:38 AM   #3 (permalink)
 
Join Date: May 2004
Posts: 10,715
Feedback Score: 7 reviews
Send a message via AIM to Thrak
Thrak's Garage
Default

there is no "setting" on the brakes.. all that does is change how far the lever is from the bar.


sounds like you need to do some maintenance it... what have you done so far?
Thrak is offline   Reply With Quote
Old 10-02-2006, 11:40 PM   #4 (permalink)
Senior Member
 
stive403's Avatar
 
Join Date: May 2004
Location: Milwaukee, WI
Posts: 321
Feedback Score: 1 reviews
Send a message via ICQ to stive403 Send a message via AIM to stive403 Send a message via Yahoo to stive403
stive403's Garage
Default

is there drag on the brakes when you don't have the brakes applied at all? Like if you put the bike on the front stand and spin the wheel, does it spin freely?
stive403 is offline   Reply With Quote
Old 10-05-2006, 11:01 PM   #5 (permalink)
Senior Member
 
cookiemonster's Avatar
 
Join Date: Jul 2005
Posts: 117
Feedback Score: 0 reviews
cookiemonster's Garage
Default

Yes there is drag on the front wheel, and the only maintenance was the bleeding.
cookiemonster is offline   Reply With Quote
Old 10-06-2006, 02:13 AM   #6 (permalink)
Senior Member
 
Join Date: May 2004
Posts: 203
Feedback Score: 0 reviews
Send a message via ICQ to silverr6
silverr6's Garage
Default

Make sure you are squeezing them with only two fingers, and do it gently. It sounds to me like you might be just a bit inexperienced, which is fine but new riders need to understand motorcycle brakes are waaaay different from car brakes.
silverr6 is offline   Reply With Quote
Old 10-06-2006, 11:58 AM   #7 (permalink)
Senior Member
 
cookiemonster's Avatar
 
Join Date: Jul 2005
Posts: 117
Feedback Score: 0 reviews
cookiemonster's Garage
Default

^I know how to work the brakes

If there is serious drag on the front tire does that mean the piston seals need replacement or something is wrong inside the master cyclinder?
Attached Images
File Type: jpg 6.JPG (6.3 KB, 17 views)
cookiemonster is offline   Reply With Quote
Old 10-06-2006, 02:22 PM   #8 (permalink)
Senior Member
 
stive403's Avatar
 
Join Date: May 2004
Location: Milwaukee, WI
Posts: 321
Feedback Score: 1 reviews
Send a message via ICQ to stive403 Send a message via AIM to stive403 Send a message via Yahoo to stive403
stive403's Garage
Default

Possibly, if there's a lot of drag, that means the pistons aren't pulling back at all (retracting) and you would have instant lever. It still shouldn't seam any more powerful, but you would have pressure right away, which isn't what you really want and will put extra heat into your system as you are dragging the brakes at all times. You should be getting a few rotations out of your front wheel when on a stand.

and as said before, the dial on the lever won't change how stiff the brakes are, but will adjust the reach.

You say the brakes are too stiff... or too powerful? The only things that will effect how stiff the brakes feel are: Caliper retraction, caliper deflection, brake line expansion, fluid compression, seal compliance. The things that will effect brake power are: Master cylinder piston diameter, caliper piston diameter (and of course number of pistons at that point), master cylinder lever reach, friction material (pads).

So seeing as all you did was flush fluid, I'm thinking maybe your old fluid might have been junk and had water/air in it and now your brakes likely feel the way they should... Always hard to diagnose when you don't have the bike in front of you.

If there is drag on the front wheel, try taking the calipers off, push the pistons back into the calipers (be careful brake fluid doesn't overflow the reservoir while doing this), remount the calipers, and pump the lever to push the pistons back out, try rotating the wheel again.
stive403 is offline   Reply With Quote
Old 10-06-2006, 03:39 PM   #9 (permalink)
Senior Member
 
cookiemonster's Avatar
 
Join Date: Jul 2005
Posts: 117
Feedback Score: 0 reviews
cookiemonster's Garage
Default

ok let me go into more detail

When I squeeze the lever with just a little bit of pressure it has the same effect as doing a panic stop, almost to a point of locking up the front tire.

If I gently squeeze the front brake lever at speeds the front end begins to heavily vibrate.

The setting of 1-4 on the brake lever dial has little effect, basically brake lever is always the farthest distance from bar on any setting.

When the front tire is off the ground it will maybe do 1/2 a full spin, even when rolling the bike I can hear the pads pressured on the rotors with no pressure on the brake lever.
cookiemonster is offline   Reply With Quote
Old 10-07-2006, 10:13 AM   #10 (permalink)
Dragraces too much
 
fjman's Avatar
 
Join Date: Nov 2004
Posts: 1,641
Feedback Score: 1 reviews
Send a message via ICQ to fjman Send a message via AIM to fjman
fjman's Garage
Default

You will normally hear the pads on the rotor. Not always, but this is really very common.

However, being only able to rotate the tire one turn while on a stand? Your shit is dragging hard, mate. Odds are that the seals on the caliper pistons are 1) shot or 2) full of crap.

Hate to say it, but bite the bullet and rebuild the calipers. You may not need to replace the pistons if you just get them nice and smooth (never sand up and down them, always around), replace the seals, clean the crap out of the housing(s). When you put it back together, use nice fresh brake fluid to lubricate the pistons as you put them in. Rebleed the system and try again.

You also may want to try a different set of pads, as a cheap experiment, while you're in there.
__________________
1990 FJ1200, 740lbs race ready with rider
1.68 60' 4.549 330'
10.912 1/4 ET 124.16 1/4 MPH
Strapped, -1" rear, UNI pods, V&H 5˚ advance, pump 87, V&H SS2R 4-1 <---JUNK, YZF 17x5 wheel, Shinko 170, jetted correctly.
fjman is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Powered by vBadvanced CMPS v3.2.2


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum
R6MessageNet.com is an independent Yamaha enthusiast website. Content on R6MessageNet.com is generated by its users and R6MessageNet.com is not in any way affiliated with Yamaha Motor Corporation, U.S.A.