Diagnostic Information And Procedures; Hydraulic Brake Diagnostic System Check - GMC chervolet camaro 1999 Service Manual

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5-12 Hydraulic Brakes
Brakes
Diagnostic Information and Procedures
Hydraulic Brake Diagnostic System Check
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Symptom
Causes
Improper Brake Pedal Travel
• Leaking brake line or connection. Refer to Hydraulic
Brakes.
• Leaking piston seal. Refer to Disc Brakes.
• Leaking master cylinder (internal). Replace master
cylinder.
• Air in brake system. Refer to Hydraulic Brake System
Bleeding (Manual Bleed) or Hydraulic Brake System
Bleeding (Pressure Bleed).
• Contaminated or improper brake fluid. Refer to Brake
Fluid and Brake Fluid Handling.
• Leaking vacuum or booster system. Refer to Hydraulic
Brakes.
• Damaged vacuum booster. Refer to Vacuum Brake
Booster Replacement.
• Uneven brake lining wear. Refer to Disc Brakes.
• Brake lining damage by abuse. Refer to Disc Brakes.
• Improper thickness variation in rotor. Refer to Brake
Rotor Thickness Variation Check.
• Excessive lateral runout in rotor. Refer to Brake Rotor
Lateral Runout Check.
• Brake assembly attachments loose (including splash
· shield). Refer to Disc Brakes.
• Improperly adjusted stoplamp switch or cruise control
vacuum dump. Refer to Stop/amp Switch Adjustment.
• Incorrect vacuum booster pushrod length. Refer to
Hydraulic Brakes.
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• Low brake fluid. Refer to Master Cylinder ReseNoir
Filling.
• Improper rear brake adjustment. Refer to Parking Brake.
• Low engine vacuum. Refer to Hydraulic Brakes.
Brake Pedal Travel Gradually Increases
• Leaking brake line or connection. Refer to Brake
Fluid Leaks.
• Leaking piston seal. Refer to Brake Caliper Overhaul
(Front) or Brake Caliper Overhaul (Rear).
• Leaking master cylinder (internal). Replace master
cylinder.
• Restricted passage in the vacuum booster. Refer to
Hydraulic Brakes.
• Damaged vacuum booster. Refer to Vacuum Brake
Booster Replacement.
• Restricted brake fluid passage. Refer to Hydraulic
Brakes.
(

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