Chevrolet Sonic Repair Manual: Drum Brake System Description and Operation
- System Component Description
-
The drum brake system consists of the following:
- Drum Brake Shoes
-
Applies mechanical output force, from hydraulic brake wheel cylinders, to friction surfaces of brake drums.
- Brake Drums
-
Uses mechanical output force applied to friction surface from drum brake shoes to slow speed of tire and wheel assembly rotation.
- Brake Drum Hardware
-
Secures drum brake shoes firmly in proper relationship to hydraulic brake wheel cylinders. Enables sliding motion of brake shoes needed to expand toward friction surface of drums when mechanical output force is applied. Provides return of brake shoes when mechanical output force is relieved.
- Brake Drum Adjusting Hardware
-
Provides automatic adjustments of brake shoes to brake drum friction surface whenever brake apply occurs.
- System Operation
-
Mechanical output force is applied from the hydraulic brake wheel cylinder pistons to the top of the drum brake shoes. The output force is then distributed between the primary and secondary brake shoes as the shoes expand toward the friction surface of the brake drums. The brake shoes apply the output force to the friction surface of the brake drums, which slows the rotation of the tire and wheel assemblies. The proper friction of both the drum brake hardware and adjusting hardware is essential to the proper distribution of braking force.
Drum Brake Hardware Replacement (J93, J94)
Removal Procedure
Warning: Refer to Brake Dust Warning.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the tire and wheel assembly. Re ...
Parking Brake Adjustment (Drum Brake)
Note: The park brake cable adjusting nut is a nylon lock type. Use
ONLY HAND TOOLS whenever tightening or loosening the adjusting nut.
Apply and fully release the park brake several times ...
Other materials:
If the Off Indicator Is Lit for an Adult-Size Occupant
If a person of adult size is sitting in the front outboard passenger seat, but
the off indicator is lit, it could be because that person is not sitting properly
in the seat. Use the following steps to allow the system to detect that person and
enable the front outboard passenger frontal airb ...
Taillamps, Turn Signal, Stoplamps, and Back-Up Lamps
Sedan Taillamp Shown, Hatchback Taillamp Similar
1. Back-up Lamp
2. Turn Signal Lamp
3. Stop Lamp/Taillamp
4. Sidemarker Lamp
To replace one of these bulbs:
1. Open the trunk.
2. Remove the two screws, which secure the taillamp assembly.
3. Remove the taillamp assembly by pulling it stra ...
Manual Shift Detent Lever with Shaft Position Switch Assembly and Park Pawl
Actuator Installation
Table 1:
Park Pawl Actuator Guide Installation
Table 2:
Park Pawl Actuator Installation
Park Pawl Actuator Guide Installation
Park Pawl Actuator Guide Installation
Callout
Component Name
...
0.0085