Brake Bleeding Procedure for Toyota Prado 120 Series

Toyota Prado 120 Series
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Introduction

This document outlines the proper procedure for bleeding the brakes on a Toyota Prado 120 series, addressing issues such as a sinking brake pedal after pad replacement. The procedure differs depending on the ABS system type.

Problem

A common issue encountered after replacing brake pads on a Prado 120 series is a sinking or spongy brake pedal, indicating air in the brake lines.

Solution

The following procedure is the key to bleeding the brakes correctly:

  • Identify ABS Type: Determine if the vehicle has an “Accumulator type” ABS/Traction control system (found on VX and Grande models). These models do not have a conventional vacuum brake booster. GXL models generally have a vacuum booster and conventional Bosch ABS.
  • Fluid Type: Use DOT 3 brake fluid. The correct fluid type is usually indicated on the master cylinder cap.
  • Bleeding Procedure - Accumulator Type ABS (VX, Grande):
    1. Turn the ignition ON. This activates the electric motor within the ABS unit, maintaining pressure.
    2. Bleed the brakes using the conventional two-person method or a vacuum bleeder. Ensure the reservoir is topped up at all times.
    3. Consider using a scan tool to cycle the ABS module for a more thorough bleed.
  • Bleeding Procedure - Conventional Bosch ABS (GXL):
    1. Bleed the brakes using the conventional two-person method or a vacuum bleeder. Ignition state is not critical for this type of system.
    2. Ensure the reservoir is topped up at all times.

Relevant Parts and Specifications

  • Brake Fluid: DOT 3

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