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Old 11-08-2002, 03:35 PM
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The size of the reservoir is gauged to the size of the wheel slave cylinder. Since disc brakes have a much larger piston than do the non-disc smaller rear wheel slave cylinder, the larger disc requires more fluid and hence the larger size of the reservoir.

When you have drums front and rear and there are two cylinders in front and one in the rear, then the larger reservoir again is gauged to the greater need up front. If they were both the same either double or single front and back then the reservoir is usually the same size.
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