Buick Regal: Hydraulic Brake System Flushing
WARNING: Refer to Brake Fluid Irritant Warning.
CAUTION: Refer to Brake Fluid Effects on Paint and Electrical
Components Caution.
CAUTION: Only use products that comply with GM specifications and check
manufacturer information respectively. We recommend the use of GM
genuine products. Instructions must be followed at all times. The use of any
type of fluid other than the recommended type of brake fluid, may cause
contamination which could result in damage to the internal rubber seals
and/or rubber linings of hydraulic brake system components.
1. 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, brake dust
2. Inspect the master cylinder reservoir cap diaphragm and the
reservoir-to-master cylinder grommets
for swelling, indicating brake fluid contamination.
3. 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 applicable procedures:
- Brake Master Cylinder Replacement
- Front Brake Hose Replacement (JQ5), Front Brake Hose Replacement (J60),
or
Front Brake Hose Replacement (J17)
- Rear Brake Hose Replacement (GNC) or Rear Brake Hose Replacement (GNQ)
- Front Brake Caliper Replacement (JQ5) , Front Brake Caliper Replacement
(J60) ,
or Front Brake Caliper Replacement (J17)
- Rear Brake Caliper Replacement (GNC) or Rear Brake Caliper Replacement
(GNQ)
- Electronic Brake and Traction Control Module with Brake Pressure
Modulator
Valve Replacement (2.0L LTG) or Electronic Brake and Traction Control Module
with Brake Pressure Modulator Valve Replacement (3.6L LGX)
- Clean out all the hydraulic brake pipes using denatured alcohol, or
equivalent.
- 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 applicable procedures:
4. 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.
5. Fill the brake master cylinder reservoir to the maximum-fill level with GM
approved brake fluid from a clean, sealed brake fluid container. Refer to Fluid
and Lubricant Recommendations.
6. 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 (Pressure) or Hydraulic Brake System Bleeding (Manual).
READ NEXT:
Removal Procedure
1. Without draining the coolant and without disconnecting the hoses, position
aside the radiator surge
tank.
2.
Power Brake Booster Vacuum Pipe Fitting (1)@Power Brake Booster Vac
System Component Description
The brake assist system consists of the following:
Brake Pedal
Receives, multiplies and transfers brake system input force from driver.
Brake Pedal Pushrod
Transfers multi
SEE MORE:
Anti-Theft Locking System
Warning:
Do not use the system if there are
people in the vehicle! The doors
cannot be unlocked or opened
from the inside.
The vehicle is equipped with a
deadbolt locking feature in addition
to the standard door locks.
The deadbolt is engaged whenever
on the RKE transmitt
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.
DTC Descriptors
D