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Shock Absorbers: Inspection

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1987 GMC Safari, 1987 GMC S15 Pickup, 1987 GMC S15 Jimmy, 1987 GMC Cab & Chassis, and 1987 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. On hydraulic fluid filled shock, purge air from pressure chamber by mounting 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 on reservoir tube or mounting threads. Check rubber grommets for damage or deterioration and replace as needed. Stroke shock by hand at various rates of speed and note resistance.
  3. Rebound (up) resistance is normally stronger than compression (down) by about 2:1. Ensure resistance is smooth and constant for each stroking rate. It is normal to detect a hissing noise (orifice swish).
  4. Check gas-charged "Firm Ride" shocks in the same manner as hydraulic fluid filled type by following steps 2) through 4). Also note that if a lag is noticed when shock is stroked, the gas-filled cell has ruptured and the shock must be replaced.
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