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Bellows Comparison Check

WARNING: This page does not describe the selected car, but rather 124 other vehicles, including the 1991 Chevrolet Pickup, 1991 Chevrolet Cab & Chassis, 1988 GMC Vandura Special, 1988 GMC Vandura, and 1988 GMC Value Van. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using Comparison Gauge (J-24466), compare load of vacuum modulator with known good modulator of same type. Part number is stamped on modulator dome. Install good modulator on either end of gauge.
  2. Install modulator in question on opposite end of gauge. Holding modulators in horizontal position, bring them slowly together under pressure. If modulator in question is bad, gauge line will remain Blue. If modulator in question is good, gauge line will be White.
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