Workshop Repair and Service Manuals GMC SIERRA
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Chassis

Brake Pedal Assembly Replacement (J90 J95 J96 JH6 Two-mode Hybrid) Hydraulic Brakes Brake Pedal Assembly      Removal ProcedureBlock the drive wheels. Disconnect the brake pedal position sensor electrical connector.Remove the brake pedal position sensor bolt-(1). Remove the brake pedal position sensor-(1). Remove the power...
Brake Pedal Pushrod Inspection Hydraulic Brakes Brake Pedal Assembly      Disconnect the brake pedal pushrod-(1) from thebrake pedal.Inspect the brake pedal pushrod eyeletbushing-(2), if equipped, for cracks and/or excessivewear.Reposition the pedal pushrod boot-(3) toward thefront of the vehicle...
Brake Pedal Travel Measurement and Inspection (Non-Hybrid) Hydraulic Brakes Brake Pedal Assembly      Special Tools J-28662 Brake Pedal Effort Gauge With the ignition OFF and the brakes cool, apply the brakes 3–5-times, or until thebrake pedal becomes firm, in order to deplete the brake booster power reserve.Install the...
Brake Pipe Replacement - part 2      Inspect the stripped end of the brake pipe to ensure that the proper amount of coatinghas been removed. Specification 6.35-mm (0.250-in) for 4.76-mm (3/16-in) diameter pipe9.50-mm (0.374-in) for 6.35-mm (1/4-in) and 7.94-mm...
Brake Pipe Replacement      Special Tools CH-45405 Brake Pipe Flaring Kit For equivalent regional tools, refer toSpecial Tools. Warning:Refer toBrake Fluid Irritant Warning. Warning:Always use double walled steel brake pipe when replacingbrake...
Brake Pressure Modulator Valve Replacement - part 2      Slide the EBCM/BPMV and bracketassembly-(1)-toward the center of the vehicleand remove the assembly from the vehicle frame.Place the EBCM/BPMV and bracket assembly on a clean worksurface. Remove the BPMV bolts-(1)....
Brake Pressure Modulator Valve Replacement      Removal Procedure Warning:The high pressure accumulator-(HPA) and thechambers of the brake modulator assembly to which it attaches,store brake fluid at extremely high pressures. Fluid pressure mustbe relieved before attempting...
Brake Pressure Modulator Valve Replacement (With JL4)      Removal Procedure Caution:Refer toBrake Fluid Effects on Paint and Electrical Components Caution. Place the ignition switch in the OFF position.Raise and support the vehicle. Refer toLifting and Jacking the Vehicle.Clean the...
Brake Rotor Assembled Lateral Runout Measurement (JD9 JF3 JF7 JG4) Disc Brakes Brake Rotors      Special ToolsCH-39544-KIT Complete Torque Socket Set, or equivalentCH-41013 Rotor Resurfacing KitCH-42450-A Wheel Hub Resurfacing KitCH-45101 Hub and Wheel Runout GaugeCH-45101-100 Conical Brake Rotor Washers For equivalent...
Brake Rotor Drum Balance Inspection Disc Brakes Brake Rotors      Support the vehicle drive axle on a suitable hoist. Refer toLifting and Jacking the Vehicle.Remove the tire and wheel assemblies from the drive axle.Refer toTire and Wheel Removal and Installation. Warning:Refer toWork Stall...
Brake Rotor Thickness Measurement Disc Brakes Brake Rotors      Warning:Refer toBrake Dust Warning If the inboard friction surface of the brake rotor is not accessible, reposition andsupport the caliper with the brake pads. Refer toFront Disc Brake Pads Replacementand/orRear Disc Brake...
Brake Rotor Thickness Variation Measurement Disc Brakes Brake Rotors      Warning:Refer toBrake Dust Warning. Note:Any disc brake rotor that exhibits thickness variationexceeding the maximum acceptable level must be refinished orreplaced. Thickness variation exceeding the maximum acceptablelevel...
Brake Shoe Replacement Drum Brakes Drum Shoes      Removal Procedure Warning:Refer toBrake Dust Warning. Note:Always replace brake shoes in axle sets. Remove the brake drum. Refer toBrake Drum Replacement. Remove the brake shoe adjuster actuator lever spring-(1). Remove...
Brake System Hydraulic Assist and Control Description and Operation (Two-mode Hybrid) - part 4      This mechanicalforce is converted into hydraulic pressure by the primary piston ofthe master cylinder. The pressurized brake fluid from the primary piston isdelivered to the brake modulator assembly and is directed withinthe...
Brake System Hydraulic Assist and Control Description and Operation (Two-mode Hybrid) - part 3      When the ignition is turned to OFF, without pausing atACCESSORY, and the brake pedal is not applied, the system willdeactivate and depressurize. As the system begins to depressurize,brake fluid will discharge from the HPA and...
Brake System Hydraulic Assist and Control Description and Operation (Two-mode Hybrid) - part 2      Sensor data of HPAfluid pressure is used by the modulator to operate the pump tomaintain the pressure of the brake fluid at the HPA withinoperating range. Working pressure of the HPA stored fluidis-140–180-bar(2030–2610-psi)....
Brake System Hydraulic Assist and Control Description and Operation (Two-mode Hybrid)      System Component Description master cylinder high pressure pessure normally control unit accumulator closed compliance accumulator pump The hydraulic brake system consists of the following: Hydraulic Brake Master Cylinder...
Brake System Warning Light      With the ignition on, the brake system warning light comes on when the parking brakeis set. If the vehicle is driven with the parking brake engaged, a chime sounds whenthe vehicle speed is greater than 8-km/h (5-mph). The...
Camber Description Wheels      Camber is the tilting of the wheels from the vertical whenviewed from the front of the vehicle. When the wheels tilt outwardat the top, the camber is positive-(+). When the wheeltilts inward at the top, the camber...
Caster Description Wheels      Caster is the tilting of the uppermost point of the steeringaxis either forward or backward, when viewed from the side of thevehicle. A backward tilt is positive-(+) and a forwardtilt is negative-(?). Caster...
Drivetrain and Front Suspension Frame Front Crossmember Replacement (1500 Series)      Drivetrain and Front Suspension Frame Front Crossmember Replacement Callout Component Name Preliminary Procedure Remove the oil pan skid plate. Refer toOil Pan Skid Plate Replacement. 1 Engine Front...
Drivetrain and Front Suspension Frame Front Crossmember Replacement (2500 3500 Series)      Drivetrain and Front Suspension Frame Front Crossmember Replacement Callout Component Name Preliminary ProceduresRaise the vehicle. Refer toLifting and Jacking the Vehicle.If equipped, remove the oil pan skid plate....
Drivetrain and Front Suspension Frame Insulator Replacement (Regular Cab)      Removal Procedure Note:Ensure that the vehicle is unloaded prior to bodyremoval. Remove the master cylinder. Perform the followingsteps:Remove the nuts retaining the master cylinder to the brakebooster.Remove the master...
Drum Brake Adjusting Hardware Inspection Drum Brakes      Warning:Refer toBrake Dust Warning. Visually inspect the adjuster actuatorspring-(1)-for the followingconditions:Excessive stretching, twisting, or bindingExcessive bending or breakage at any pointExcessive...