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Home >> GMC >> 1990 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> DISC & DRUM (C, G, K, P, R & V Series) >> Testing >> Hydro-Boost Testing >> Preliminary Checks

Preliminary Checks

NOTE: Make the following checks, and repairs if necessary, before performing any test on the Hydro-Boost system.
  1. Check fluid levels in master cylinder and power steering pump. Check power steering pump drive belt. Check power steering hoses for leaks or kinks.
  2. Check for air in brake fluid or power steering fluid. Check engine idle speed. Check steering pump for proper pressure.
NOTE: If problem cannot be found in preliminary steps or tests, check areas of brake system that might cause condition. See TROUBLE SHOOTING .
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