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10th February 2012
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Custom Bike Builder
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Join Date: Jun 2005
Location: Phoenix, AZ
Posts: 2,348 Sportster/Buell Model: XL 883 C Sportster/Buell Year: 2005 Sportster/Buell Model #2: 2007 XL 883 Sportster/Buell Year #2: 2007
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Rear brake, sometimes hard sometime soft
OK, I have had issues with the POS rear brake on this bike forever. The Master has been rebuilt by HD twice, then I did it my self.
The brake works, it will stop you. Here are my issues. Yes, I have the factory manual.
1. when backing the bike up, it makes a rubbing noise.
2. Sometimes the pedal is stiff, sometimes the pedal goes all the way before it stops.
I have just gotten used to it, but this weekend I think I am going to take the caliper off and clean it up, I just changed the brake pads on it. topped it off with fluid.
My wife's bike is an 07 and I haven't had any issues with it.
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The only regret about the sporty, is that I didn't buy it sooner.
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10th February 2012
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XL FORUM TEAM MEMBER
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Join Date: Oct 2010
Posts: 1,276 Sportster/Buell Model: XL1200 R Sportster/Buell Year: 2004
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I think if you have done all that then it has to be in the linkage, maybe something is turning round that has worn out.
I'm sure you know all this, but...
How are you bleeding the brakes? Do you have a pressure bleed setup? I have heard the rear is a bitch to bleed properly. Could be air?
The only other thing I can imagine is that the rear disc is warped? Making the Pads Knock off? so you get a slack pedal intermittently.
You say the MC has been repaired have you changed the seals in the caliper or checked the pot is not binding? does the caliper slide freely and is greased up?
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Regards,
Loony
2004 XL1200 Roadster - TC88A Jester 4 (Thanks Rico) - EZ IMS - CVP Jet Needle - 46 pilot - 180 Main - K&N Airfilter - SEII Slipons.
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10th February 2012
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Custom Bike Builder
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Join Date: Jun 2005
Location: Phoenix, AZ
Posts: 2,348 Sportster/Buell Model: XL 883 C Sportster/Buell Year: 2005 Sportster/Buell Model #2: 2007 XL 883 Sportster/Buell Year #2: 2007
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I will report back looney....I have to check out some of those things. Everything seemed to be in order. I am gonna pull it and have a look see.
I bled then with a vacuum bleed thing, they are a PITA to bleed.
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10th February 2012
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Senior Chief Master Mechanic 1st Class
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Join Date: Aug 2011
Location: Southern Maryland
Posts: 1,216 Sportster/Buell Model: 883 sportster Sportster/Buell Year: 2006
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Your rear brake should not be ashamed of this. Millions of rear breaks suffer from this problem, and it can is often treatable with modern pharmaceuticals and psychological counseling.
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Everyone in a cage is trying to kill you, best not to make it easy for them.
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11th February 2012
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Jester Mafia
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Join Date: Jan 2008
Location: So Cal
Posts: 8,572 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2006 Sportster/Buell Model #2: XL1200C Sportster/Buell Year #2: 2006 Other Motorcycle Model: 48 Other Motorcycle Year: 2012
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Replace the Master Cylinder
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Thy Sportster Come
It Shall Be Done
On Earth as it is on Salt
2006 Sportster XL1200C
Mikuni HSR 45
Jetted 30 slow,175 Main
97 Needle,Clip posistion 3
Hurricane Flow 3" offset AC,Rocketman Mod
Daytona Twin Tec TC88A,Rico Nomad Map
Sumax Thundervolt plug wires,NGK DCPR8EIX spark plugs. Gapped .040 and Indexed
Patriot Defender Pipe
Royal Purple 20W50 MC oil
Wix 57148 oil filter
Max Power, 77.73
Max Torque, 75.98
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11th February 2012
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XL FORUM TEAM MEMBER
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Join Date: Nov 2009
Location: Daytona Beach, FL
Posts: 1,838 Sportster/Buell Model: XL1200c Sportster/Buell Year: 2006
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next time you bleed, but the bike up on the lift and let the caliper hang down below the slave cylinder. It helps.
If you are loosing fluid you may have a small leak, I would say to replace the crush washers and torque it all down good!
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"A democracy cannot exist as a permanent form of government. It can only exist until the voters discover that they can vote themselves largesse from the public treasury. From that moment on, the majority always votes for the candidates promising the most benefits from the public treasury with the result that a democracy always collapses over loose fiscal policy, always followed by a dictatorship.
Alexander Fraser Tytler
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11th February 2012
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Chief Harley Engineer
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Join Date: Jan 2011
Posts: 570 Sportster/Buell Model: 1200s Sportster/Buell Year: 1998
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Quote:
Originally Posted by PiousDevil
Your rear brake should not be ashamed of this. Millions of rear breaks suffer from this problem, and it can is often treatable with modern pharmaceuticals and psychological counseling.
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No doubt!! They also get leaky at old age, so I've heard.
Sounds like a leak in the line somewhere to me also. |
12th February 2012
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Jester Mafia
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Join Date: Jan 2008
Location: So Cal
Posts: 8,572 Sportster/Buell Model: XL1200C Sportster/Buell Year: 2006 Sportster/Buell Model #2: XL1200C Sportster/Buell Year #2: 2006 Other Motorcycle Model: 48 Other Motorcycle Year: 2012
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Ask Wedge how we know !
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12th February 2012
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Biker
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Join Date: Jan 2011
Location: Longview
Posts: 46 Sportster/Buell Model: 883c Sportster/Buell Year: '99 Other Motorcycle Model: RoadKing Other Motorcycle Year: '99
Reputation: 10
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Get a set of "speed bleeders" off Ebay.  |
12th February 2012
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Whitworth Products
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Join Date: Jun 2010
Posts: 6,480 Sportster/Buell Model: 1200R Sportster/Buell Year: 2005 Other Motorcycle Model: 5 bikes and 1 quad
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Quote:
Originally Posted by DIESEL
OK, I have had issues with the POS rear brake on this bike forever. The Master has been rebuilt by HD twice, then I did it my self.
The brake works, it will stop you. Here are my issues. Yes, I have the factory manual.
1. when backing the bike up, it makes a rubbing noise.
2. Sometimes the pedal is stiff, sometimes the pedal goes all the way before it stops.
I have just gotten used to it, but this weekend I think I am going to take the caliper off and clean it up, I just changed the brake pads on it. topped it off with fluid.
My wife's bike is an 07 and I haven't had any issues with it.
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When you say you did it yourself, what did you do, replace the MC, or did you rebuild it, or did you just take it apart and look at it?
This is the symptom of a split primary cup, and both Rocketman and I have had the problem.
What seems to be happening on some is that the primary cup is molded with a tit in the center of it that is placed inside a washer that is welded to the return spring inside the MC. This is supposed to keep the spring centered in the cup, but it seems like the lateral forces that it gets when braking cause it to tear that tit out of the center of the cup.
It starts as a small tear and the metal piston behind it keeps it from leaking when you push the pedal, but some times a bit leaks past the cup and the pedal will go to the ground. Then it works again sometimes.
Mine showed up while changing a rear tire and it never did start working again until the MC was rebuilt.
Slightly different symptoms with Rocketman's bike, but same exact torn cup. |
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