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techtalk:evo:wheels02r [2020/06/25 00:24] hippysmack [Torn Internal Primary Rubber Cup] |
techtalk:evo:wheels02r [2024/01/09 03:14] (current) hippysmack |
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| ====== Torn Internal Primary Rubber Cup ====== | ====== Torn Internal Primary Rubber Cup ====== | ||
| - | There have been many reports of 2004-2007 Sportster owners having the rear master cylinder go out. ((wedge of the XLFORUM http://xlforum.net/forums/showthread.php?t=65452&page=8)) \\ | + | There have been many reports of 2004-2007 Sportster owners having the rear master cylinder go out. ((wedge of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-drivetrain/sportster-motorcycle-tires-wheels-and-brakes-aa/34640-rear-master-cylinder/page8?t=65452&page=8)) \\ |
| The usual problem is the rubber cup in the bore rupturing leading to low or no brake pressure to the rear wheel. \\ | The usual problem is the rubber cup in the bore rupturing leading to low or no brake pressure to the rear wheel. \\ | ||
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| Bleeding is the other problem, and the big loop in the brake line is a possible cause for this (trap for air). \\ | Bleeding is the other problem, and the big loop in the brake line is a possible cause for this (trap for air). \\ | ||
| Some have also said that the return hole in the MC is too small. But enlarging it is risky unless you can make sure that there is no burr left to hurt the new cup. \\ | Some have also said that the return hole in the MC is too small. But enlarging it is risky unless you can make sure that there is no burr left to hurt the new cup. \\ | ||
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| + | Here's an XLForum thread about this issue: https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-drivetrain/sportster-motorcycle-tires-wheels-and-brakes-aa/204609-every-once-in-a-while-my-brake-pedal-goes-limp?t=2082017 | ||
| {{:techtalk:evo:wheels:2004_torn_cup_1_in_master_cylinder_by_devilswild66.jpg?direct&300|}} {{:techtalk:evo:wheels:2004_torn_cup_2_in_master_cylinder_by_devilswild66.jpg?direct&500|}} \\ | {{:techtalk:evo:wheels:2004_torn_cup_1_in_master_cylinder_by_devilswild66.jpg?direct&300|}} {{:techtalk:evo:wheels:2004_torn_cup_2_in_master_cylinder_by_devilswild66.jpg?direct&500|}} \\ | ||
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| + | ====== Red or Orange Goop in Fluid Reservoir ====== | ||
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| + | This phenomena is still a mystery but it has been noticed repeatedly in the brake fluid reservoir especially in 2004-2006 Sportsters using DOT 5 fluid. \\ | ||
| + | It has been said to look like a mixture with the appearance of Italian oil and vinegar dressing with an orange tint. ((Oldwrench of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/76433-rear-brake-master-cylinder-failure-with-only-3-500-mi/page3?t=543932&page=3)) \\ | ||
| + | DOT 5 has been used in Harley brake systems since mid 1976 and the only reports known are in 2004 and later brake systems. \\ | ||
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| + | One idea is that DOT3,4 or 5.1 might have been added to (top off) the fluid level. \\ | ||
| + | But that would cause thick goop to drop out of suspension as the fluid would coagulate into thick gumps. \\ | ||
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| + | Although DOT 5 will come in several different colors when new from the bottle, it'll turn yellowish then clear as it gets older and used. \\ | ||
| + | This doesn't have any affect on it's performance, but the color change can bring a concern. \\ | ||
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| + | {{:techtalk:evo:wheels:2004_oil_reservoir_by_66impala.jpg?direct&300|}} ((photo by 66impala of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-general-discussion-and-problems/76433-rear-brake-master-cylinder-failure-with-only-3-500-mi/page3?t=543932&page=3)) \\ | ||
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