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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> Suspension >> Front Suspension >> Suspension - Front Coil Spring (2WD) >> Removal & Installation >> Shock Absorbers >> Inspection

Shock Absorbers: Inspection

  1. On fluid-filled shock, purge air from pressure chamber by mounting shock in vise (top end up) and fully extending unit. Reverse position (top end down) and fully collapse unit. Repeat procedure several times.
  2. Bench check shock unit by mounting in vise with top end up (top end down on gas-charged shocks). DO NOT clamp vise on reservoir tube or mounting threads. Check rubber grommets for deterioration and replace as needed. Operate shock by hand at various rates of speed and note resistance. If resistance is not smooth and constant, replace shock.