Chevrolet Cobalt Service & Repair Manual: Description
AC-Delco Tandem Diaphragm Type
| This unit utilizes a vacuum power chamber, consisting of a front and rear shell, housing divider, front and rear diaphragm, plate assemblies, hydraulic pushrod and a diaphragm return spring, Fig. 1. |
| In normal operating mode, with service brakes in released position, the booster operates with vacuum on both sides of its diaphragms. When brakes are applied, air at atmospheric pressure is admitted to one side of each diaphragm to provide power assist. When the service brake is released, atmospheric air is shut off from one side of each diaphragm. The air is then drawn from the booster through the vacuum check valve to the vacuum source. |
GM/Toyota Single Diaphragm Type
| The Toyota/GM single diaphragm type booster assembly is located between the master cylinder and brake pedal, Fig. 2. When the brake pedal is depressed, the force is transmitted to the master cylinder piston through the valve operating rod, booster air valve, reaction disc and piston rod. The force of the booster piston is developed because of the pressure difference between the front and rear chambers. |
Fig. 1 Exploded view of AC-Delco tandem diaphragm booster
Fig. 2 Exploded view of GM/Toyota brake booster
Adjustments
Brake Pedal
1.
With ignition OFF and brakes cool,
apply brakes three or four times, or until brake pedal becomes firm,
in order to deplete brake booster power ...
General Service
Two basic types of power assist
mechanisms are used: vacuum assist diaphragm assemblies, which use engine
vacuum or in some cases vacuum pressure developed by an external vacuum
pum ...
See also:
Chevrolet Cobalt Owners Manual. Audio System(s)
Determine which radio the vehicle has and read the
following pages to become familiar with its features.
WARNING:
Taking your eyes off the road for extended periods
could cause a crash resulting in injury or death to
you or others. Do not give extended attention to
entertainment tasks while dr ...
Chevrolet Cobalt Owners Manual
- In Brief
- Seats and Restraint System
- Features and Controls
- Instrument Panel
- Driving Your Vehicle
- Service and Appearance Care
- Maintenance Schedule
- Customer Assistance Information
Chevrolet Cobalt Service Manual
- Air Bags
- Air Conditioning & Heater
- Body & Frame
- Brakes
- Cooling System
- Driveline
- Electrical
- Electronic Stability Controls
- Engine Service
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