Preliminary Check

With engine stopped, depress brake pedal several times. This will eliminate all accumulator reserve from system. Hold the brake pedal depressed with medium pressure (25-35 lbs.) and start engine. If the unit is operating correctly, the brake pedal will fall slightly, then push back against driver's foot, remaining at about the same position. If the booster is not operating correctly, the trouble may be one of the following causes:

POSSIBLE CAUSE	CORRECTION
1) Loose or broken power steering pump belt.	1) Tighten or replace belt.
2) No fluid in power steering reservoir.	2) Fill reservoir and check for internal leaks.
3) Leaks in power steering, booster or accumulator hoses.	3) Replace defective components.
4) Leaks at tube fittings, power steering booster or accumulator connection.	4) Tighten fittings or replace tube seals, if defective.
5) External leakage at accumulator.	5) Replace booster assembly.
6) Faulty booster piston seal causing leakage at booster flange vent.	6) Replace all booster seals.
7) Faulty booster input rod seal with leakage at input rod end.	7) Replace all booster seals.
8) Faulty booster cover seal with leakage between housing and cover	8) Replace all booster seals.
9) Faulty booster spool plug seal.	9) Replace all booster seals.
10) Internal leakage in booster.	10) Replace booster assembly.
11) Contamination in power steering fluid.	11) Flush power steering system and replace with new fluid.
12) Incorrect routing of hydraulic lines.	12) Re-route hydraulic lines.