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20th June 2011
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Drag Race Champion
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Join Date: Aug 2009
Location: BUFFALO
Posts: 381 Sportster/Buell Model: 883c Sportster/Buell Year: 2005
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brakes lose pressure only with passenger
so apperently every single time i have a passenger, my rear brakes lose all pressure. not immediatly but after a few miles of stop and go traffic. when i ride myself the brakes rebuild pressure by themselves. i took apart the master cylinder and didnt find a ripped cup like others have had. i brought it to an indy and them check it out but it was working that day so they said it was fine. i took the caliper apart also and cleaned and lubed it up. bled lines and worked like they are supposed to, then ride with a passenger and they lose pressure again. its never happened when im riding solo. the easy fix is to not ride a passenger, but seriously what the hell is going on. too much weight, me and my ol lady arent that fat. lol
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21st June 2011
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Whitworth Products
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Join Date: Jun 2010
Posts: 6,466 Sportster/Buell Model: 1200R Sportster/Buell Year: 2005 Other Motorcycle Model: 5 bikes and 1 quad
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Describe "loose pressure". Do you mean the brake pedal goes all the way to the bottom and nothing?
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21st June 2011
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Drag Race Champion
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Join Date: Aug 2009
Location: BUFFALO
Posts: 381 Sportster/Buell Model: 883c Sportster/Buell Year: 2005
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brake goes all the way down with absolutly no braking power. not weak break, none at all.
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21st June 2011
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Greasemonkey
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Join Date: Jan 2010
Posts: 113 Sportster/Buell Model: xl1200r Sportster/Buell Year: 2006
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Losing pressure? Or brake fade?
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21st June 2011
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Drag Race Champion
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Join Date: Aug 2009
Location: BUFFALO
Posts: 381 Sportster/Buell Model: 883c Sportster/Buell Year: 2005
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then overnight, pressure builds back up on its own.
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21st June 2011
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Drag Race Champion
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Join Date: Aug 2009
Location: BUFFALO
Posts: 381 Sportster/Buell Model: 883c Sportster/Buell Year: 2005
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im not sure what brake fade is
but brake pedal goes all the way down with no response at all
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21st June 2011
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Chief Know It All
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Join Date: Jan 2009
Location: N. W. Arkansas, USA
Posts: 420 Sportster/Buell Model: XL1200L Sportster/Buell Year: 2006 Other Motorcycle Model: V-twin Schwinn Chopper Other Motorcycle Year: 2006
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I'd get a new master cyl. rebuild kit and put in there.
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21st June 2011
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Drag Race Champion
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Join Date: Aug 2009
Location: BUFFALO
Posts: 381 Sportster/Buell Model: 883c Sportster/Buell Year: 2005
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alank, i am already planing on it, i just wonder if anyone has ever heard of this. it has happened 4 or 5 times. everytime i have a passenger. never when i ride alone. and im riding everyday.
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21st June 2011
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Senior Chief Know It All 1st Class
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Join Date: Mar 2005
Location: Near Chicago, IL
Posts: 1,144
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What fluid are you running DOT 4 or DOT 5? Might be that the extra braking effort is boiling the fluid - and that will cause fade. DOT 5 has a higher boiling point than DOT 4 and mixing DOT 4 and 5 will cause all kinds of issues.
SEMJPM
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21st June 2011
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Senior Custom Bike Builder
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Join Date: Mar 2010
Location: Pikeville Ky
Posts: 2,737 Sportster/Buell Model: 1200c 1980 chopped frame Sportster/Buell Year: 1995 Sportster/Buell Model #2: Ironhead chopper Sportster/Buell Year #2: 1979 Other Motorcycle Model: Nightster GF's Bike Other Motorcycle Year: 2008
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i had a master cylinder once that i had to tap the brake real fast before i pushed it, if i didn't the petal would go all the way down with no braking power. disassembled it several times, found nothing wrong with it put a kit in and still never fixed it. not much fun when your running rear brake only. I replace/upgraded to a better one.
__________________
1979 Ironhead Chopper aka Home Wrecker
1995 1200 on a modified 1980 frame rigid mount swingarm
2008 Nightster GF's bike
Why buy parts, when you can pick up some tools and make something way cooler?
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