File in Section:
Bulletin No.:

Service Bulletin

Date:

05 - Brakes
13-05-22-001B
September, 2014

INFORMATION
Subject:

Pre-Formed and Pre-Flared Hydraulic Brake Pipe Kits Now Available for Service

Models:

2000-2006 Cadillac Escalade Models
2000-2006 Chevrolet Avalanche, Suburban, Tahoe
1999-2007 Chevrolet Silverado
2000-2006 GMC Yukon Models
1999-2007 GMC Sierra

This bulletin has been revised to emphasize the continued availability of pre-formed and
pre-flared hydraulic brake pipe kits. Please discard bulletin 13–05–22–001A.

The purpose of this bulletin is to inform dealers of an
improved service strategy to aid in the replacement of
hydraulic brake pipes for the above listed vehicles.
Customer Care and Aftersales (CCA) has released
pre-formed and pre-flared hydraulic brake pipe kits.
These kits can be used anytime replacement of the
entire brake pipe assemblies is required. These kits
include all the pre-formed and pre-flared brake pipes
needed when replacing the entire brake pipe assembly,
except the rear axle crossover pipe. If the rear axle
crossover pipe requires replacement, refer to the
appropriate parts catalog for ordering and the Brake
Pipe Replacement procedure in SI for installation
instructions. The following procedure describes how to
install these kits.

Replacement Procedure (Pickup and
Cab Chassis)
Removal
Warning: Brake fluid may irritate eyes and skin. In
case of contact, take the following actions:
• 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
Copyright 2014 General Motors LLC. All Rights Reserved.

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.
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

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September, 2014

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.
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
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: For Chassis Cab models, due to the installation
and mounting of the aftermarket equipment/body on the
rear of the chassis (i.e. flatbed, stake bed, box van,

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

dump body, etc) by the second stage manufacturer or
vehicle upfitter, it may be difficult or prohibitive to
remove the aftermarket body to enable replacement of
the OEM rear brake pipe. Each vehicle will need to be
assessed individually, however, it may be preferable to
hand bend a service replacement brake pipe using GM
P/N 88936298 PIPE, BRK (STEEL) (1/4" X 16 FT
ROLL) nylon coated bulk tubing available separately
from GM dealers, using GM P/N 15103241 Fitting, BRK
PIPE (1/2-20-2A THD) (1/4 TUBE STL) to attach to the
ABS module (BPMV) and GM P/N 11609443 Tube Nut
(7/16-24 UNS-2A THD) to attach to the rear axle jounce
hose. These tube nuts are designed to properly fit over
the nylon coated brake tubing. The tube nuts can also
be removed from the replacement rear pipe included in
the brake pipe service kit and installed on the hand
bent service replacement pipe. Route the hand bent
service replacement pipe from the ABS module
(BPMV) to the rear axle jounce hose ensuring adequate
clearance is maintained between the pipe and
surrounding components to ensure that the pipe is not
damaged in service. Attach the hand bent service
replacement brake pipe securely to the chassis using
brake pipe clips, rubber coated P-clips, or other
suitable methods. The maximum distance between
attachment points or clips should not exceed 457 mm
(18"). If a brake pipe has a directional change (bend) of
30 degrees or more, a clip needs to be located as close
as possible to the bend.

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.: 13-05-22-001B

September, 2014

3339729

3. For vehicles equipped with a combination valve,
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 3

8. 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
9. 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)
10. Remove the left and right front wheelhouse panels.
Refer to Wheelhouse Panel Replacement in SI.
11. Remove the engine protection shield, if equipped.
Refer to Engine Protection Shield Replacement
in SI.
12. 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.
13. Disconnect any wiring ground harnesses from the
body to the frame. Refer to Power and Grounding
Component Views in SI
14. Remove the 3 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.
15. 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.

3339730

5. For vehicles equipped with a combination valve,
disconnect the secondary (1) and primary (2) brake
pipe fittings from the combination valve.
6. Raise and support the vehicle. Refer to Lifting and
Jacking the Vehicle in SI.
7. Remove the front and rear tire and wheel
assemblies. Refer to Tire and Wheel Removal and
Installation in SI.

16. Place blocks or supports inboard of the frame side
rails to support the body in at least 3 locations.
17. Remove the left side pickup box bolts and loosen,
but do not remove, the right side pickup box bolts.
Refer to Pickup Box Replacement in SI.
Note: Only raise the pickup box enough to gain hand
access to the brake pipe routing clips. Pay careful
attention to avoid stressing hoses and wiring
harnesses.
18. Carefully raise the left side of the pickup box
approximately 51 mm (2 in).
Note: Place the support blocks as close to the pickup
box mounting points as possible to evenly distribute the
weight of the vehicle body.
19. Place blocks or supports inboard of the frame side
rails to support the pickup box in at
least 3 locations.
20. Release the body wiring harness conduit from the
brake pipe retainers on the left side of the vehicle.

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September, 2014

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

21. Position and secure the wiring harness aside.

2728198

2727389

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

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

2728205

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

2728189

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

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

September, 2014

2728215

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

Page 5

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.
33. Identify the brake pipe port locations at the BPMV
prior to disconnecting the brake pipe fittings.

2728225

2728220

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

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

Page 6

September, 2014

2728241

36. 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.
37. Using a 6 point socket, remove and discard the
brake pipe fitting tube nuts.
38. Carefully remove the brake pipe routing clips from
the front brake pipe assembly.
39. Maneuver the front brake pipes one at a time and
remove the brake pipes from the vehicle.

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

2728250

42. Release the rear brake pipe from the left frame rail
clips (1).

2728259

43. Release the rear brake pipe from the left frame rail
clips (1).

2728234

40. Using side cutters, cut the rear brake pipe (1) as
close as possible to the brake pipe fitting at
the BPMV.
41. Using a 6 point socket, remove and discard the
brake pipe fitting tube nut.

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

September, 2014

Page 7

2728497

44. Using side cutters, cut the rear brake pipe (1) as
close as possible to the brake pipe fitting at the
rear brake hose.
45. Using a 6 point socket, remove and discard the
rear brake pipe fitting tube nut.
46. Remove the rear brake pipe from the vehicle.

2728497

1. Install the rear brake pipe.
2. Install the rear brake pipe fitting tube nut (1).

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

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.

2728259

3. Install the rear brake pipe to the left frame rail
clips (1).

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September, 2014

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

2728250

4. Install the rear brake pipe to the left frame rail
clips (1).

2728225

6. Install the right front brake pipe fitting tube nut (2).

Tighten
Tighten the nut to 25 Y (18 lb ft)
7. Install the left front brake pipe fitting tube nut (1).

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

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.
5. Connect the brake pipe fittings to the BPMV port
locations identified during removal.

2728234

8. Install the rear brake pipe fitting tube nut (1).

Tighten
Tighten the nut to 25 Y (18 lb ft)
Note: Install the brake pipes to the routing clips and
retaining clips after all the brake pipes are fitted to the
vehicle.
9. Install the master cylinder primary and secondary
brake pipe assembly to the vehicle.

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

September, 2014

Page 9

2728241

10. Install the master cylinder primary brake pipe fitting
tube nut (1).

Tighten
Tighten the nut to 25 Y (18 lb ft)
11. Install the master cylinder secondary brake pipe
fitting tube nut (2).

2728215

13. Install the left front brake pipe fitting tube nut (1).

Tighten
Tighten the nut to 25 Y (18 lb ft)
14. Install the front brake pipes assembly to the left
frame rail clip (2).

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

2728205

15. Install the right front brake pipe to the left front
frame rail clips (1).
2728220

12. Install the front brake pipes assembly to the left
frame rail clips (1).

Page 10

September, 2014

2728198

16. Install the right front brake pipe to the front frame
crossmember clips (1).

2727389