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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 12th March 2009
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beornj beornj is offline
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Default Is this normal brake wear?

Just changed my brake pads for the first time on this bike, and man the wear was uneven. The calipers are stock one pot P.O.S.es but this wear pattern still blew me away. The piston side pads had about half of the friction material left, but the pads on the fixed side were worn to nothing. If this is normal then no wonder you guys are so down on the stock calipers. What is the recommended upgrade that won't break the bank?

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  #2  
Old 12th March 2009
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Not normal. Something is preventing the caliper from moving properly. Make sure to properly lube the appropriate pins and rods before reassembly.
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  #3  
Old 12th March 2009
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Quote:
Originally Posted by dashadow View Post
Not normal. Something is preventing the caliper from moving properly. Make sure to properly lube the appropriate pins and rods before reassembly.
I did use pin lube on all appropriate rods and bushings during reassembly, and cleaned everything. Maybe the PO didn't. I don't know.
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  #4  
Old 12th March 2009
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What replacement pads did you use?

Fox
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  #5  
Old 12th March 2009
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Quote:
Originally Posted by dashadow View Post
Not normal. Something is preventing the caliper from moving properly. Make sure to properly lube the appropriate pins and rods before reassembly.
+1 Something's preventing the caliper from floating freely. Poorly lubed or worn pins
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  #6  
Old 31st May 2009
argentcorvid argentcorvid is offline
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Default

I just took my pads out today and they look the same as beornj's. Piston side looks almost new, but the 'fixed' one is completely gone.

This is my first time in brakes of any kind. which pins and rods we talking about lubricating here?
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  #7  
Old 31st May 2009
alank alank is offline
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The pins that the calipers are supposed to slide back and forth on. The calipers should float freely and move fromm side to side (slightly) with little resistance.
Whats happening is when presure is applied to the piston, it moves out against the rotor and pulls the entire caliper over so the other (solid) pad applies pressure to the back side of the rotor. When you let off the brake, the piston is releasing its pressure against the rotor, but the caliper is sticking in position keeping pressure applied to the back side of the rotor instead of sliding away from the rotor on the mounting pins.
Mounting pins often become dry and cause this, so check them at regular intervals, 3000 to 5000 if you want to really keep them in good shape would be my suggestion.
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Old 1st June 2009
argentcorvid argentcorvid is offline
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Quote:
Originally Posted by alank View Post
The pins that the calipers are supposed to slide back and forth on. The calipers should float freely and move fromm side to side (slightly) with little resistance.
Whats happening is when presure is applied to the piston, it moves out against the rotor and pulls the entire caliper over so the other (solid) pad applies pressure to the back side of the rotor. When you let off the brake, the piston is releasing its pressure against the rotor, but the caliper is sticking in position keeping pressure applied to the back side of the rotor instead of sliding away from the rotor on the mounting pins.
Mounting pins often become dry and cause this, so check them at regular intervals, 3000 to 5000 if you want to really keep them in good shape would be my suggestion.
Cool, so this should be pretty easy. Is this what they mean by "Pin Lube" in the instructions in the FM, or is that for when you are actually rebuilding the caliper? Do I just use regular grease?
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Old 1st June 2009
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I use copperslip grease - just don't get any on the face of your pads or on the disc.
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Old 1st June 2009
alank alank is offline
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I don't have an OM, but it is most likely what they are talking about when they say "pin lube" in the brake area of the OM, and should be done at regular intervals or any other time you remove the caliper, don't
wait until you rebuild the caliper. Calipers can last nearly forever if the fluid is kept changed to keep the moisture out.
Be sure to check the condition of the rubber covers or seals that help to keep the dirt and moisture out and replace any that are damaged. Clean the old grease off the pin and out of the caliper as best you can and I use a small amount of regular grease to keep them moving easy. Regular interval service is what keeps them in good shape.
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