2727389

18. Install the right front brake pipe fitting tube nut (1).

Tighten
19.
20.

21.
22.
23.
24.
25.
26.
2728189

17. Install the right front brake pipe to the clips (1) on
the right frame rail.

27.
28.

Tighten the nut to 25 Y (18 lb ft)
Reposition the body wiring harness into the brake
pipe retaining clips.
Remove the blocks, lower the body and install
the 3 left side body mount bolts. Refer to Drivetrain
and Front Suspension Frame Insulator
Replacement in SI.
Remove the blocks, lower the pickup box and
install the pickup box bolts. Refer to Pickup Box
Replacement in SI.
Inspect the pickup box for correct alignment.
Connect any wiring ground harnesses from the
body to the frame. Refer to Power and Grounding
Component Views in SI.
Connect the parking brake front cable. Refer to
Parking Brake Front Cable Replacement in SI.
Connect the left front wheel speed sensor
electrical connector and install the sensor harness
retaining clips to the top of the left frame rail.
Install the engine protection shield, if equipped.
Refer to Engine Protection Shield Replacement
in SI.
Install the left and right front wheelhouse panels.
Refer to Wheelhouse Panel Replacement in SI.
Lower the vehicle enough to access the
combination valve and master cylinder brake pipe
fittings.

Bulletin No.: 13-05-22-001A

April, 2014

Page 11

3339730

29. For vehicles equipped with a combination valve,
connect the secondary (1) and primary (2) brake
pipe fittings to the combination valve.

Tighten

3339728

31. Connect the master cylinder secondary (1) and
primary (2) brake pipe fittings to the master
cylinder.

Tighten

Tighten the brake pipe fittings to 25 Y (18 lb ft).

Tighten the nut to 25 Y (18 lb ft)
32. Bleed the hydraulic brake system. Refer to
Hydraulic Brake System Bleeding in SI.
33. Install the front and rear tire and wheel assemblies.
Refer to Tire and Wheel Removal and Installation
in SI.

Replacement Procedure (Utilities)
Removal
Warning: Brake fluid may irritate eyes and skin. In
case of contact, take the following actions:

3339729

30. For vehicles equipped with a combination valve,
connect the master cylinder secondary (1) and
primary (2) brake pipe fittings to the combination
valve.

Tighten
Tighten the brake pipe fittings to 25 Y (18 lb ft).

• Eye contact—rinse thoroughly with water.
• Skin contact—wash with soap and water.
• If ingested—consult a physician immediately.
Caution: Avoid spilling brake fluid onto painted
surfaces, electrical connections, wiring, or cables.
Brake fluid will damage painted surfaces and cause
corrosion to electrical components. If any brake fluid
comes in contact with painted surfaces, immediately
flush the area with water. If any brake fluid comes in
contact with electrical connections, wiring, or cables,
use a clean shop cloth to wipe away the fluid.
Caution: Care should be taken to ensure that dirt,
water, grease, or other contaminants do not enter the
new brake pipes and threaded end fittings when the
pipes are being installed into the vehicle. Use tape or
other appropriate methods to cover the threaded end
fittings and the ends of the pipes to prevent dirt, water,
grease, or other contaminants from entering the pipes.
Remove all protective measures before connecting the
end fittings to the master cylinder, brake pressure
proportioning valve (where equipped), brake pressure
modulator valve (BPMV), or flexible brake hoses.

Page 12

April, 2014

Caution: Cleanliness is important for the proper
function of the hydraulic brake system. Clean all dirt,
water, rust, etc from the areas adjacent to each brake
pipe tube nut before removing the brake pipe tube nuts.
Take care to ensure that no contaminants enter any
hydraulic fittings or openings during removal or
installation of the brake pipes.
Caution: Before removing any brake pipes from the
master cylinder, ABS module (BPMV), and the brake
pressure proportioning valve (where equipped) identify
the port locations. On the BPMV identify the port
location for each hydraulic component (e.g., Master
Cylinder Primary, Master Cylinder Secondary, LF
corner, RF corner, LR corner, RR corner, Rear Brake).
On the brake pressure proportioning valve identify the
port locations for each hydraulic component
(e.g. master cylinder primary inlet, master cylinder
primary outlet, master cylinder secondary inlet, master
cylinder secondary outlet, pre-charge pump). When
installing the replacement pipes, ensure that the
replacement pipes are installed in the correct port
locations on the master cylinder, BPMV, and brake
pressure proportioning valve, where equipped. If the
pipes are not installed in the correct port locations on all
the hydraulic components, the brake system including
the ABS system and/or TCS/VSES Stabiltrak system
(where equipped) will not operate correctly and may
result in damage to the hydraulic brake components.
Note: This procedure does not comprehend specific
vehicle models or brake system configurations. The
illustrations may not exactly reflect the vehicle being
repaired. Some LD pickups and LD SUVs may be
equipped with a brake pressure combination valve and
a brake pressure modulator valve pre-charge pump.
The brake pipes attached to these components should
be removed and replaced with the replacement pipes
provided in the service kit.

Bulletin No.: 13-05-22-001A

cylinder or brake pressure proportioning valve that
attaches to the master cylinder to brake booster
mounting studs. The replacement pipes in this kit will
not use the flexible hose sections. The replacement
pipes have been designed to fit each vehicle
application. Because of the nylon coating on the
outside of the brake pipes, the outside diameter of the
pipe is slightly larger than the original pipes, Extra effort
may be required to insert the pipes into the existing
mounting clips. It is recommended to finger start all the
threaded end fittings into the master cylinder, brake
pressure proportioning valve, brake pressure
modulation valve, and flexible brake hoses before
performing the final tightening and torque of each
fitting.
Note: The brake pipes in these kits may have
additional large radius shipping bends to allow the
pipes to fit within the cardboard box. Those pipes with
additional shipping bends will have tags on either side
of each shipping bend. Carefully straighten the section
of pipe between the tags to remove the shipping bend.
Take care not to kink or damage the brake pipes. If a
brake pipe becomes kinked or damaged while
removing the shipping bends, it must be repaired or
replaced before installation into the vehicle. Take care
not to cut, nick, abrade or otherwise damage the nylon
coating on the brake pipes during installation.

Note: This procedure is not intended for the repair or
replacement of a single damaged brake pipe. This
procedure is for the replacement of the entire brake
pipe assemblies with pre-formed and pre-flared
components.
Note: Remove the brake pipes from the existing
routing clips carefully to avoid damaging the clips as all
the clips will be re-used. The new brake pipes will be
reinstalled into the existing clips. After installing the
new brake pipes, inspect the routing of the brake pipes
to ensure that the new brake pipes do not contact or
rub on any frame, body, or chassis components.
Carefully bend the pipes to increase clearance as
required.
Note: The brake pipes in these kits are not an exact
duplicate of the pipes currently installed on the vehicle.
These pipes have a nylon coating to provide better
corrosion protection and may have slightly different
shapes and bends and may not exactly match the
brake pipes being replaced. Some original equipment
pipes may use flexible hose sections near the master

3339728

1. Disconnect the master cylinder secondary (1) and
primary (2) brake pipe fittings from the master
cylinder.
2. Plug the master cylinder outlet ports to prevent
brake fluid loss and contamination.

Bulletin No.: 13-05-22-001A

April, 2014

3339729

3. Disconnect the master cylinder secondary (1) and
primary (2) brake pipe fittings from the combination
valve.
4. Plug the combination valve inlet ports to prevent
brake fluid loss and contamination.

Page 13

3339731

7. If equipped, disconnect the BPMV front brake pipe
fitting (1) from the combination valve.
8. Plug the combination valve port to prevent brake
fluid loss and contamination.

3339732
3339730

5. Disconnect the secondary (1) and primary (2) brake
pipe fittings from the combination valve.
6. Plug the combination valve outlet ports to prevent
brake fluid loss and contamination.

9. If equipped, disconnect the BPMV front brake pipe
fitting (1) from the brake pressure modulator valve
(BPMV) pre-charge pump.
10. Plug the BPMV pre-charge pump port to prevent
brake fluid loss and contamination.
11. Lower the spare tire and wheel assembly.
12. Raise and support the vehicle. Refer to Lifting and
Jacking the Vehicle in SI.
13. Remove the front and rear tire and wheel
assemblies. Refer to Tire and Wheel Removal and
Installation in SI.

Page 14

April, 2014

14. Apply ACDelco Rust Penetrant and Inhibitor
10-4020 (GM P/N 88862628 ) or equivalent
penetrating lubricant to the bleeder screws of the
following components:
• Front brake calipers
• Rear brake calipers
15. Apply ACDelco Rust Penetrant and Inhibitor
10-4020 (GM P/N 88862628 ) or equivalent
penetrating lubricant to the brake pipe fitting tube
nuts at the following locations:
• Front brake hoses
• Brake pressure modulator valve (BPMV)
• Rear brake hose(s)
16. Remove the left and right front wheelhouse panels.
Refer to Wheelhouse Panel Replacement in SI.
17. Remove the engine shield, if equipped. Refer to
Engine Shield Replacement in SI.
18. Reference mark the parking brake front cable
adjuster nut at the equalizer and disconnect the
parking brake front cable. Refer to Parking Brake
Front Cable Replacement in SI.
19. Disconnect any wiring ground harnesses from the
body to the frame. Refer to Power and Grounding
Component Views in SI.
20. Remove the 6 left side body mount bolts and the
core support mount bolt. Refer to Drivetrain and
Front Suspension Frame Insulator Replacement
in SI.
Note: Only raise the body enough to gain hand
access to the brake pipe routing clips. Pay careful
attention to avoid stressing hoses and wiring
harnesses.

Bulletin No.: 13-05-22-001A

2727389

25. Using side cutters, cut the right front brake pipe as
close as possible to the brake pipe fitting (1) at the
brake hose.
26. Using a 6 point socket, remove and discard the
right front brake pipe fitting tube nut.
27. Disconnect the left front wheel speed sensor
electrical connector and remove the sensor
harness retaining clips from the top of the left
frame rail.

21. Carefully raise the left side of the body from
inboard of the frame rails
approximately 51 mm (2 in).
Note: Place the support blocks inboard of the frame
rails and as close to the body mounting points as
possible to evenly distribute the weight of the
vehicle body.
22. Place blocks or supports inboard of the frame side
rails to support the body in at least 3 locations.
23. Release the body wiring harness conduit from the
brake pipe retainers on the left side of the vehicle.
24. Position and secure the wiring harness aside.

2728189

28. Release the right front brake pipe from the
clips (1) on the right frame rail.

Bulletin No.: 13-05-22-001A

April, 2014

2728198

29. Release the right front brake pipe from the front
frame crossmember clips (1).

Page 15

2728215

31. Using side cutters, cut the left front brake pipe as
close as possible to the brake pipe fitting (1) at the
brake hose.
32. Using a 6 point socket, remove and discard the left
front brake pipe fitting tube nut.
33. Release the front brake pipes assembly from the
left frame rail clip (2).

2728205

30. Release the right front brake pipe from the left front
frame rail clips (1).
2973737

34. Release the front brake pipes assembly from the
left frame rail clips (1).
35. Clean the area surrounding the brake pipe fittings
on the BPMV thoroughly to remove all dirt and
debris.

Page 16

April, 2014

3339723

Bulletin No.: 13-05-22-001A

3339724

Note: Due to the similarity of the brake pipe fitting tube
nuts, it is imperative to identify the individual brake pipe
locations on the BPMV to ensure correct assembly.

Note: Due to the similarity of the brake pipe fitting tube
nuts, it is imperative to identify the individual brake pipe
locations on the BPMV to ensure correct assembly.

36. For vehicles not equipped with RPO JL4, identify
the brake pipe port locations at the BPMV prior to
disconnecting the brake pipe fittings.

38. For model year 2003-2008 vehicles equipped with
RPO JL4, identify the brake pipe port locations at
the BPMV prior to disconnecting the brake pipe
fittings.

3339725

Note: Due to the similarity of the brake pipe fitting tube
nuts, it is imperative to identify the individual brake pipe
locations on the BPMV to ensure correct assembly.
37. For model year 2002 vehicles equipped with
RPO JL4, identify the brake pipe port locations at
the BPMV prior to disconnecting the brake pipe
fittings.

2973756

39. Using side cutters, cut the master cylinder
primary (1) and secondary (2) brake pipes as close
as possible to the brake pipe fitting at the BPMV.
40. Using a 6 point socket, remove and discard the
brake pipe fitting tube nuts.

Bulletin No.: 13-05-22-001A

April, 2014

2973950

41. Using side cutters, cut the right front (1) and left
front (2) brake pipes as close as possible to the
brake pipe fittings at the BPMV.
42. Using a 6 point socket, remove and discard the
front brake pipe fitting tube nuts.
43. Carefully remove the brake pipe routing clips from
the front brake pipe assembly.
44. Maneuver the front brake pipes one at a time and
remove the brake pipes from the vehicle.

Page 17

2975122

47. Release the rear brake pipes from the left frame
rail clips (1).

2975213

2974926

45. Using side cutters, cut the left rear (1) and right
rear (2) brake front pipes as close as possible to
the brake pipe fittings at the BPMV.
46. Using a 6 point socket, remove and discard the
brake pipe fitting tube nuts.

48. Using side cutters, cut the right rear (1) and left
rear (2) brake pipes as close as possible to the
brake pipe fittings at the rear brake frame to
axle hose.
49. Release the rear brake pipes from the frame
crossmember clip (3).
50. Using a 6 point socket, remove and discard the
brake pipe fitting tube nuts.
51. Remove the rear brake pipes from the vehicle.

Page 18

April, 2014

Bulletin No.: 13-05-22-001A

Installation
Caution: Use the correct fastener in the correct
location. Replacement fasteners must be the correct
part number for that application. Do not use paints,
lubricants, or corrosion inhibitors on fasteners, or
fastener joint surfaces, unless specified. These
coatings affect fastener torque and joint clamping force
and may damage the fastener. Use the correct
tightening sequence and specifications when installing
fasteners in order to avoid damage to parts and
systems. When using fasteners that are threaded
directly into plastic, use extreme care not to strip the
mating plastic part(s). Use hand tools only, and do not
use any kind of impact or power tools. Fastener should
be hand tightened, fully seated, and not stripped.

2975122

5. Install the rear brake pipes to the left frame rail
clips (1).

2975213

1. Install the rear brake pipes to the vehicle.
2. Install the right rear brake pipe fitting tube nut (1) to
the rear brake frame to axle hose.

Tighten
Tighten the nut to 25 Y (18 lb ft)
3. Install the left rear brake pipe fitting tube nut (2) to
the rear brake frame to axle hose.

Tighten
Tighten the nut to 25 Y (18 lb ft)
4. Install the rear brake pipes to the frame
crossmember clip (3).

3339723

Note: Due to the similarity of the brake pipe fitting tube
nuts, it is imperative to identify the individual brake pipe
locations on the BPMV to ensure correct assembly.
6. For vehicles not equipped with RPO JL4, connect
the brake pipe fittings to the BPMV port locations
identified during removal.

Bulletin No.: 13-05-22-001A

April, 2014

Page 19

3339725

Note: Due to the similarity of the brake pipe fitting tube
nuts, it is imperative to identify the individual brake pipe
locations on the BPMV to ensure correct assembly.
7. For model year 2002 vehicles equipped with
RPO JL4, connect the brake pipe fittings to the
BPMV port locations identified during removal.

2974926

9. Install the left rear brake pipe fitting tube nut (1) to
the BPMV.

Tighten
Tighten the nut to 25 Y (18 lb ft)
10. Install the right rear brake pipe fitting tube nut (2) to
the BPMV.

Tighten
Tighten the nut to 25 Y (18 lb ft)

3339724

Note: Due to the similarity of the brake pipe fitting tube
nuts, it is imperative to identify the individual brake pipe
locations on the BPMV to ensure correct assembly.
8. For model year 2003-2006 vehicles equipped with