Chevrolet Trax: Hydraulic brake system flushing
WARNING: Refer to Brake Fluid Irritant Warning .
CAUTION: Refer to Brake Fluid Effects on Paint and Electrical
Components Caution .
- Inspect the brake fluid for the following conditions, indicating brake
fluid contamination:
Fluid separation, indicating 2 types of fluid are present. A substance
other than the recommended
brake fluid has been introduced into the brake hydraulic system.
- Swirled appearance - oil-based substance
- Layered appearance - silicone-based substance
Fluid discoloration, indicating the presence of moisture or particles that
have been introduced into
the brake hydraulic system.
- Cloudy appearance - moisture
- Dark appearance/suspended particles in fluid - dirt, rust, corrosion and/or
brake dust
- Inspect the master cylinder reservoir cap diaphragm and the
reservoir-to-master cylinder grommets for
swelling, indicating brake fluid contamination.
- If the brake fluid WAS contaminated with an oil-based or a
silicone-based substance, indicated by fluid
separation and/or a swollen master cylinder reservoir cap diaphragm and/or
swollen reservoir-to-master
cylinder grommets, perform the following:
- Remove ALL of the following components listed from the vehicle. Each
component contains
internal rubber seals/linings which have been contaminated by the
contaminated brake fluid in the
brake hydraulic system.
Refer to the procedures indicated:
- Master Cylinder Replacement
- Front Brake Hose Replacement
- Rear Brake Hose Replacement (Drum Brake), Rear Brake Hose
Replacement (Disc
Brake)
- Front Brake Caliper Replacement
- Rear Brake Caliper Replacement , if equipped
- Rear Brake Cylinder Replacement , if equipped
- Brake Proportion Valve Replacement , if equipped
- Brake Pressure Modulator Valve Replacement , if equipped
- Clean out all the hydraulic brake pipes using denatured alcohol.
- Dry the brake pipes using non-lubricated, filtered air.
- Repair or replace ALL of the following components listed and
install them to the vehicle. Each
component contains internal rubber seals/linings which have been
contaminated by the
contaminated brake fluid in the brake hydraulic system.
Refer to the procedures indicated:
- Master Cylinder Replacement ; also perform the following:
- Clean the brake master cylinder reservoir using denatured alcohol, then
dry the reservoir
using non-lubricated, filtered air. Inspect the reservoir for cracks and/or
damage and replace
if necessary. Refer to Master Cylinder Reservoir Replacement.
- Front Brake Hose Replacement
- Rear Brake Hose Replacement (Drum Brake), Rear Brake Hose Replacement (Disc
Brake)
- Front Brake Caliper Replacement
- Rear Brake Caliper Replacement , if equipped
- Rear Brake Cylinder Replacement , if equipped
- Brake Proportion Valve Replacement , if equipped
- Brake Pressure Modulator Valve Replacement , if equipped
- If the brake fluid WAS NOT contaminated with an oil-based or a
silicone-based substance, but WAS
contaminated with water or dirt, rust, corrosion, and/or brake dust, replace
the brake master cylinder
reservoir cap diaphragm which may have allowed the moisture or particles to
enter the hydraulic system.
- Fill the brake master cylinder reservoir to the maximum-fill level with
GM approved brake fluid from a
clean, sealed brake fluid container.
- Pressure bleed the hydraulic brake system. Begin the procedure with the
pressure bleeder reservoir filled
to the maximum-fill level with the correct brake fluid as indicated. Refer
to Hydraulic Brake System
Bleeding (Manual), Hydraulic Brake System Bleeding (Pressure).
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Removal Procedure
With the engine OFF, apply and release the brake pedal several times
until the pedal becomes firm to
deplete the power vacuum brake booster vacuum reserve.
Remove the battery t
Removal Procedure
With the engine OFF, apply and release the brake pedal several times to
deplete the power vacuum brake
booster vacuum reserve.
Raise and support the vehicle. Refer to Lifting a
Removal Procedure
With the engine OFF, apply and release the brake pedal several times
until the brake pedal becomes firm
to deplete the power brake booster vacuum reserve.
Remove the battery tr
SEE MORE:
NOTE: This is GENERAL information. This article is not
intended to be specific to any
unique situation or individual vehicle configuration. For model-specific
information see appropriate articles where available.
EXAMPLE #1 - VOLTAGE CONTROLLED DRIVER
These two known-good waveform patterns are from
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
Circuit/System De