C 2500 Suburban 2WD V8-454 7.4L VIN J SFI (1998)
Vacuum Brake Booster: Service and Repair
Brake Booster Push Rod Gauging Procedure (Vacuum Brake Booster)
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Tools Required
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J 37839 Power Brake Pushrod Height Gauge
1. Gauge the vacuum booster with 85.0 kPa (25 in Hg) vacuum or maximum engine vacuum.
2. Check the maximum and minimum piston rod length using J 37839.
3. If the piston rod is not within limits, obtain a service adjustable piston rod, and adjust the rod to the correct length.