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Hydroboost Troubleshooting

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pedal  pressure  will  be  noticeably  higher.  AVOID DRIVING IN THIS CONDITION. Figure 6-8.—Hydrauiic power booster system. pump (fig. 6-8) rather than vacuum from the engine. The booster unit contains a spool valve that has an open center that controls the pump pressure as braking occurs. A lever assembly has control over the valve position and  the  boost  piston  provides  the  necessary  force  that operates the master cylinder. See figure 6-9 for a parts breakdown of the booster assembly. In the event of hydraulic pressure loss, a spring- loaded accumulator is provided on the unit. This will provide  for  at  least  two  power  brake  applications.  The brakes will operate without the power assist unit, but the HYDROBOOST TROUBLESHOOTING Hard Pedal (at an idle): This  problem  may  be  caused  by  fluid  contami- nation, pedal linkage binding, or a bad hydroboost unit. High Pedal and Steering Effort: A loose or broken power steering belt, low pump fluid level, low engine idle, a restriction in one or more hydraulic  lines,  or  a  defective  power  steering  pump  will cause  these  symptoms. Slow Pedal Return: Slow  pedal  return  can  be  caused  by  pedal  linkage binding, a restricted booster hydraulic line, or an internal problem with the hydroboost unit. Pedal Pulsation: Pedal  chatter/pulsation  is  caused  by  a  loose  or slipping drive belt, low power steering fluid level, a defective   power   steering   pump,   or   a   defective hydroboost  unit. Figure 6-9.—Hydraulic power booster assembly. 6-12



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