Pinpoint Test AB: Soft or Excessive Brake Pedal Travel

Anti-Lock Control - Hybrid

Pinpoint Test AB: Soft or Excessive Brake Pedal Travel

Normal Operation

The brake pedal should be firm at all times when applied.

This pinpoint test is intended to diagnose the following:
- Leak in the hydraulic system
- Air in brake system
- Brake master cylinder
- Hydraulic Control Unit (HCU)


PINPOINT TEST AB: SOFT OR EXCESSIVE BRAKE PEDAL TRAVEL

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AB1 RETRIEVE THE RECORDED DTCs FROM THE ABS SELF-TEST

- Check for recorded ABS DTCs from the self-test.
- Are any DTCs recorded?

Yes
REFER to DTC charts. Diagnostic Trouble Code Tests and Associated Procedures

No
GO to AB2.

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AB2 CHECK THE BRAKE SYSTEM COMPONENTS FOR CORRECT INSTALLATION OR DAMAGE

- Inspect the brake system for the following concerns:
- Check the brake pedal and bracket, brake master cylinder, brake calipers and fluid lines/hoses for correct installation.
- Check the brake pedal and bracket, brake master cylinder, brake calipers and fluid lines/hoses for damage or leaks.
- Check the flexible brake hoses for bulging with the brake pedal is pressed.
- For brake pedal and master cylinder, refer to Hydraulic Brake Actuation.
- For brake booster, refer to Power Brake Actuation.
- Are the brake system components correctly installed and free from leaks or damage?

Yes
GO to AB3.

No
REPAIR the identified concern. TEST the system for normal operation.

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AB3 BLEED THE BRAKE SYSTEM

- Bleed the brake system including the Hydraulic Control Unit (HCU) bleeding procedure. Refer to Brake System - General Information Brake System Bleeding.
- Is the concern still present?

Yes
GO to AB4.

No
The system is operating correctly at this time. The concern may have been caused by air in the brake system.

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AB4 CHECK BRAKE MASTER CYLINDER

- Carry out the Brake Master Cylinder - Bypass Condition Test in Brake System - General Information Component Tests, Component Tests.
- Did the master cylinder pass the component test?

Yes
INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) Service and Repair. TEST the system for normal operation.

No
INSTALL a new master cylinder. REFER to Hydraulic Brake Actuation Brake Master Cylinder. TEST the system for normal operation.

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