Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 726 (CONVENTIONAL BRAKE COMPONENTS)CONVENTIONAL BRAKE COMPONENTSBRAKE BOOSTER TESTLEAK TEST
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Leak Test
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Leak Test
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
- Press the brake pedal with the engine running, then turn the ignition switch to LOCK (0). The brake pedal height should not vary while pressed for 30 seconds.
- If the pedal height rises, go to step 6.
- If it does not rise, go to step 2.
- Start the engine, and let it idle for 30 seconds. Turn the ignition switch to LOCK (0), and wait 30 seconds. Press the brake pedal several times using normal pressure. When the pedal is first pressed, it should be low. On consecutive applications, the pedal height should gradually rise.
- If it rises, the booster is OK.
- If it does not rise, go to step 3.
- Disconnect the brake booster vacuum hose (A) at the booster. The check valve (B) is built into the hose.NOTE: If the check valve is faulty, replace the brake booster vacuum hose/check valve as an assembly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.