Preliminary Checks
Check fluid levels in master cylinder and power steering pump. Check belt tension and adjust if necessary. With engine off, depress brake pedal several times to eliminate all accumulator reserve from system. Hold brake pedal depressed and start engine. If unit is operating correctly, brake pedal will fall slightly then push back against drivers foot, remaining at about the same position. If booster is not operating correctly, use the following tests.
NOTE:
If problem cannot be found in preliminary steps or tests, check areas of brake system that might cause condition. See Hydraulic Brake Trouble Shooting in this Section.