W250 3/4 Ton Pickup 4WD V8-318 5.2L VIN R 4-bbl (1982)
Pedal Reserve Checks
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The pedal should be firm and not leak down.
Prior to replacing a master-cylinder for poor pedal travel or feel verify the following:
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There were no problems with any of the related systems.
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The entire brake system has been bled.
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Rear brakes are properly adjusted.