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techtalk:ref:wheels03 [2019/04/18 04:00] hippysmack [Testing Your Brake Fluid] |
techtalk:ref:wheels03 [2020/05/29 02:51] hippysmack [Mixing Brake Fluids] |
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| ====== REF: Wheels, Brakes & Tires ====== | ====== REF: Wheels, Brakes & Tires ====== | ||
| - | ===== Sub-Documents ===== | ||
| - | * . . . [[techtalk:ref:wheels03a|Bleeding the Brake Lines]] | ||
| ====== Brake System ====== | ====== Brake System ====== | ||
| + | See also [[techtalk:ref:wheels06#bleeding_the_brake_lines|Bleeding the Brake Lines]] In the REF section of the Sportsterpedia. \\ | ||
| * Brake caliper mounting bolt O-rings- Dow Corning 44 grease ("Pin Lube" in parts kit) ((1998 HD XLH FSM)) | * Brake caliper mounting bolt O-rings- Dow Corning 44 grease ("Pin Lube" in parts kit) ((1998 HD XLH FSM)) | ||
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| * If silicone is introduced into an older brake system; \\ The silicone will latch onto the sludge generated by gradual component deterioration and create a gelatin like goop. \\ (which will attract more crud and eventually plug up metering orifices or cause pistons to stick) \\ If you have already changed to DOT 5, don't compound the problem and change back. \\ You will never get all of the silicone out of your system. Just change the fluid regularly. \\ For those who race using silicone fluid; \\ Crack the bleed screws before each racing session to insure that there is no water in the calipers. ((http://importnut.net/brakefluid.htm)) | * If silicone is introduced into an older brake system; \\ The silicone will latch onto the sludge generated by gradual component deterioration and create a gelatin like goop. \\ (which will attract more crud and eventually plug up metering orifices or cause pistons to stick) \\ If you have already changed to DOT 5, don't compound the problem and change back. \\ You will never get all of the silicone out of your system. Just change the fluid regularly. \\ For those who race using silicone fluid; \\ Crack the bleed screws before each racing session to insure that there is no water in the calipers. ((http://importnut.net/brakefluid.htm)) | ||
| - | + | ==== Replacing Brake Fluid (Dot 3 to Dot 5) ==== | |
| + | |||
| + | The following is found in HD Technical Service Bulletin M-712 dated June 16,1977. \\ | ||
| + | |||
| + | When changing from D.O.T. 3 to D.O.T. 5 fluid or when flushing the brake system, it is important that D.O.T. 3 fluid be removed completely. \\ | ||
| + | Old fluid could be contaminated with water and if mixed with the new D.O.T.-5 fluid, it would detract from it's effectiveness. \\ The old fluid could also cause varnish deposits if the system is operated above the boiling point of D.O.T. 3. \\ Caution should be used when bleeding because any brake fluid on the pad will contaminate the pad material and reduce brake effectiveness. \\ The fluid absorbed by the pads cannot be removed satisfactorily with any solvent nor by operating the brakes. | ||
| + | |||
| + | **Procedure**: \\ | ||
| + | - Disconnect the brake lines from the master cylinder and wheel calipers (wheel cylinders if drum brakes). \\ Catch old fluid in container and discard. | ||
| + | - Remove master cylinder and brake calipers from motorcycle. | ||
| + | - Disconnect brake hoses from the metal brake lines (if applicable). | ||
| + | - Flush the metal brake lines several times with silicone brake fluid (D.O.T. 5) fluid to remove all the old fluid. \\ Solvent flushing is not recommended. | ||
| + | - Replace the brake hoses with new ones. | ||
| + | - Disassemble the master cylinder and wheel calipers or cylinders. | ||
| + | - Drain and remove any residual D.O.T. 3 brake fluid with a dry, clean cloth that will not leave lint or grit on the master cylinder or caliper parts. | ||
| + | - Replace master cylinder and wheel caliper rubber seals, piston cups and 0-rings with new parts. | ||
| + | - Coat pistons, piston bores and rubber parts with silicone brake fluid and reassemble. | ||
| + | - Install master cylinder and calipers on motorcycle. | ||
| + | - Reassemble brake lines to master cylinder and calipers. | ||
| + | - Fill brake system with D.O.T.-5 silicone brake fluid and bleed air from system following procedure in Service Manual. \\ Fluid leakage from the rear master cylinder boot after bleeding is often caused by excessive piston travel due to air in the system. \\ The boot should be wiped clean of any brake fluid to avoid contaminating the cylinder with road dust. | ||
| ==== DOT 3, DOT 4, DOT 5.1 ==== | ==== DOT 3, DOT 4, DOT 5.1 ==== | ||
| * DOT 3 brake fluids are mixtures of glycols and glycol ethers. DOT 4 contains borate esters in addition to what is in DOT 3. These brake fluids are somewhat similar to automotive anti-freeze (ethylene glycol) and are not a petroleum fluid. Both DOT 3-4 and DOT 5 fluids are compatible with most brake system materials except in the case of some silicone rubber external components such as caliper piston boots ((http://importnut.net/brakefluid.htm)) | * DOT 3 brake fluids are mixtures of glycols and glycol ethers. DOT 4 contains borate esters in addition to what is in DOT 3. These brake fluids are somewhat similar to automotive anti-freeze (ethylene glycol) and are not a petroleum fluid. Both DOT 3-4 and DOT 5 fluids are compatible with most brake system materials except in the case of some silicone rubber external components such as caliper piston boots ((http://importnut.net/brakefluid.htm)) | ||
