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techtalk:ih:wheels02 [2020/05/29 03:45] hippysmack [Brake Disc and Pads] |
techtalk:ih:wheels02 [2020/05/29 03:55] hippysmack [Brake Disc and Pads] |
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| ====== Brake Disc and Pads ====== | ====== Brake Disc and Pads ====== | ||
| - | From HD Teschnical Service Bulletin M-712 dated Junw 16, 1977: \\ | + | From HD Teschnical Service Bulletin M-712 dated June 16, 1977: \\ |
| //Disc brake friction material can be classified as organic, semi-metallic, or metallic. \\ | //Disc brake friction material can be classified as organic, semi-metallic, or metallic. \\ | ||
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| An organic pad will also reduce heat transfer between the brake disc and brake fluid in the caliper. \\ | An organic pad will also reduce heat transfer between the brake disc and brake fluid in the caliper. \\ | ||
| It is also less harsh on the disc and usually leaves the disc with a polished look. \\ | It is also less harsh on the disc and usually leaves the disc with a polished look. \\ | ||
| - | This material has two disadvantages: \\ | + | This material has two disadvantages: // |
| - | - The organic material will fade when high pad temperatures are developed. | + | |
| - | - Wet stopping power is very poor when the material is thoroughly wet. | + | |
| - | Metallic friction material increases it's efficiency as temperatures increase, and water has little effect on stopping performance. \\ | + | - //The organic material will fade when high pad temperatures are developed.// |
| + | - //Wet stopping power is very poor when the material is thoroughly wet. // | ||
| + | |||
| + | //Metallic friction material increases it's efficiency as temperatures increase, and water has little effect on stopping performance. \\ | ||
| Metallic linings, in normal service, have a shorter wear life than organic. \\ | Metallic linings, in normal service, have a shorter wear life than organic. \\ | ||
| - | Semi-metallic have characteristics in between the organic and metallic. \\ | + | Semi-metallic have characteristics in between the organic and metallic. \\ // |
| - | Replace pads when the thickness of the friction material has worn down to 1/16" or less on all models except those specified in the paragraph below. \\ | + | //Replace pads when the thickness of the friction material has worn down to 1/16" or less on all models except those specified in the paragraph below. \\ // |
| - | We suggest that you use only the recommended Harley-Davidson pads. \\ | + | //We suggest that you use only the recommended Harley-Davidson pads. \\ |
| 1974 thru 1977 XL, XLCH, XLT, FX, FXE, FXS models have a wear indicator slot in the front brake pad friction material. \\ | 1974 thru 1977 XL, XLCH, XLT, FX, FXE, FXS models have a wear indicator slot in the front brake pad friction material. \\ | ||
| - | Replace pads when the friction material has worn down to 3/32" thickness as shown in the illustration. \\ | + | Replace pads when the friction material has worn down to 3/32" thickness as shown in the illustration. \\ // |
| - | // | + | |
| {{:techtalk:ih:wheels:1974-1977_brake_pads_drawing_by_hippysmack.png?direct&300|}} ((drawing by Hippysmack)) \\ | {{:techtalk:ih:wheels:1974-1977_brake_pads_drawing_by_hippysmack.png?direct&300|}} ((drawing by Hippysmack)) \\ | ||
| + | |||
| + | Motorcycle brakes operate under high temperatures and can absorb far more horsepower than the engine produces. ((HD Teschnical Service Bulletin M-712 dated June 16, 1977)) \\ | ||
| + | The discs do not need a polished appearance to maintain efficiency. \\ | ||
| + | A disc with a slight amount of grooving similar to a phonograph record is normal with metallic brake pads and is acceptable if the surface is smooth. \\ | ||
| + | The newer stainless brake discs may appear grooved, but if you run your fingernail over the surface you find there are no grooves. \\ | ||
| + | Disc runout, on the motorcycle, should not exceed .015". If the disc becomes warped or dished beyond this specification it should be replaced. \\ | ||
| + | Brake pedal travel is increased with the wave washer type of piston retraction. Caution must be used when adjusting brake pedal travel. \\ | ||
| + | If the required freeplay in the plunger is adjusted away, the expanding brake fluid cannot return to the reservoir and gradual energization of the brake may occur. \\ | ||
| + | If there is any doubt concerning this freeplay or other proper operation of the master cylinder; \\ | ||
| + | The master cylinder cap should be removed and the pedal depressed several times. A squirt of fluid each time will verify proper operation. \\ | ||
| + | |||
| **Disc and pad sets**: | **Disc and pad sets**: | ||
