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Sportster Motorcycle Tires, Wheels, and Brakes Discuss issues with Sportster motorcycle tires, wheels and brakes.

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  #1  
Old 10th February 2012
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DIESEL DIESEL is offline
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Default 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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Old 10th February 2012
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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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  #3  
Old 10th February 2012
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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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  #4  
Old 10th February 2012
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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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Old 11th February 2012
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Replace the Master Cylinder
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  #6  
Old 11th February 2012
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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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  #7  
Old 11th February 2012
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Quote:
Originally Posted by PiousDevil View Post
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.
No doubt!! They also get leaky at old age, so I've heard.


Sounds like a leak in the line somewhere to me also.
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Old 12th February 2012
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Ask Wedge how we know !
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  #9  
Old 12th February 2012
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Get a set of "speed bleeders" off Ebay.
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Old 12th February 2012
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Quote:
Originally Posted by DIESEL View Post
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.
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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