Rear brake "sticky"

karlosdajackal · May 22nd, 2012, 02:43 AM

So if i use my rear brake, when I get of the bike its hard to push it around.

Its like the brake is not releasing fully. However if I have a bit of a hill so I can reverse the bike for a bit it seems too loosen up quite a bit to the point i can move it around more comfortably.

Any Ideas?

Gorilla25 · May 22nd, 2012, 03:33 AM

worn out return spring? dirty calipers? dirty piston? leaking seal? stuck pedal?..could be a lot of things. need more details. how long has it been like that? when was last brake change? last fluid change? etc..

Motofool · May 22nd, 2012, 06:00 AM

I would lubricate the guides of the pads, if a full service and cleaning is not possible.

csmith12 · May 22nd, 2012, 07:44 AM

And don't mix brake fluid types.

Francis · May 22nd, 2012, 10:27 AM

You can mix brands, but not type (DOT 3/4/5). Correct me if I'm wrong though, this is the information I ran into when I had to bleed my brakes.

csmith12 · May 22nd, 2012, 11:17 AM

Quote:

Originally Posted by Francis

You can mix brands, but not type (DOT 3/4/5). Correct me if I'm wrong though, this is the information I ran into when I had to bleed my brakes.

Sorry, for not being clear enough. Right, don't mix DOT 3/4/5.

alex.s · May 22nd, 2012, 11:29 AM

there are exceptions, like if i remember you can put dot 5.1 in 4, but not 5 in 4 or vice versa.

if the brake is sticking, its dangerous to ride on it. at very least bleed the fluid and unstick the pistons. push them out and clean the surfaces then push them back in. make sure you flush the brake line / passages to get all the crap out

leed · May 22nd, 2012, 06:18 PM

I also think 3 and 4 can go together, but 4 and 5 cannot?

Just did a little google search: DOT 3, 4, and 5.1 are hygroscopic (big word that says it readily absorbs water from humid air, basically) and they are (polyethylene) glycol based.

DOT 5 is silicone based and as such is hydrophobic (repels water). DOT 5 has a higher boiling temperature, and in addition better maintains its viscosity at high temperatures. Lastly, it's also a plus because it is not caustic (or at least not quite as bad). It's downfall is that it absorbs air instead.

By mixing 3, 4, or 5.1 you will essentially adjust the boiling temperature.

May 22nd, 2012, 02:43 AM	#1
karlosdajackal ninjette.org guru Name: Karl Location: Ireland the Hawaii of Europe! Join Date: Jun 2009 Motorcycle(s): Ninja 250R Fuel Injected Model 2009 Posts: 357	Rear brake "sticky" So if i use my rear brake, when I get of the bike its hard to push it around. Its like the brake is not releasing fully. However if I have a bit of a hill so I can reverse the bike for a bit it seems too loosen up quite a bit to the point i can move it around more comfortably. Any Ideas? __________________________________________________ My vlogs on Youtube are here

May 22nd, 2012, 06:00 AM	#3
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	I would lubricate the guides of the pads, if a full service and cleaning is not possible. __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

May 22nd, 2012, 07:44 AM	#4
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	And don't mix brake fluid types. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

May 22nd, 2012, 11:29 AM	#7
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	there are exceptions, like if i remember you can put dot 5.1 in 4, but not 5 in 4 or vice versa. if the brake is sticking, its dangerous to ride on it. at very least bleed the fluid and unstick the pistons. push them out and clean the surfaces then push them back in. make sure you flush the brake line / passages to get all the crap out __________________________________________________

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May 22nd, 2012, 03:33 AM	#2
Gorilla25 Dakine... Name: AJ Location: DFW Join Date: Jun 2011 Motorcycle(s): 2009 Ninja 250R (Sold) \| 636 (hopefully soon) Posts: A lot. Blog Entries: 5	worn out return spring? dirty calipers? dirty piston? leaking seal? stuck pedal?..could be a lot of things. need more details. how long has it been like that? when was last brake change? last fluid change? etc..

May 22nd, 2012, 10:27 AM	#5
Francis ninjette.org newbie 2,000 Name: Francis Location: Vancouver Join Date: Jan 2011 Motorcycle(s): Ninja 250r Posts: 160	You can mix brands, but not type (DOT 3/4/5). Correct me if I'm wrong though, this is the information I ran into when I had to bleed my brakes.

May 22nd, 2012, 06:18 PM	#8
leed ninjette.org sage Name: David Location: Loves Park, IL Join Date: Feb 2011 Motorcycle(s): Time will tell Posts: 969	I also think 3 and 4 can go together, but 4 and 5 cannot? Just did a little google search: DOT 3, 4, and 5.1 are hygroscopic (big word that says it readily absorbs water from humid air, basically) and they are (polyethylene) glycol based. DOT 5 is silicone based and as such is hydrophobic (repels water). DOT 5 has a higher boiling temperature, and in addition better maintains its viscosity at high temperatures. Lastly, it's also a plus because it is not caustic (or at least not quite as bad). It's downfall is that it absorbs air instead. By mixing 3, 4, or 5.1 you will essentially adjust the boiling temperature.