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Brake Fluid Leak problems of the 2007 Chevrolet Cobalt



One problem related to brake fluid leak has been reported for the 2007 Chevrolet Cobalt.

car   Brake Fluid Leak problem 1
Failure Date: 10/17/2010

I drove my car about 1/2 mile to the local cvs. When I left I started the car and the brake pedal went all the way to the floor. I had lost pressure and did not have brakes. I have a manual transmissions. I pulled over in another parking lot and pumped the brakes to get pressure back. Car ran fine for a 15 miles. The same night I drove to another location and lost pressure of the brake pedal while sitting at a stop light. I pulled over and pumped the brakes again. I have driven the car since to the dealer and they cannot replicate the problem, nor diagnose it. They said it was intermittent and most likely the brake master cylinder. There was no evidence of brake fluid leaking from any of the brake lines or around the tires. The problem is they cannot say for sure if the master cylinder is leaking internally or if a gasket or seal is failing. I am going to have the master cylinder replaced and hope that is the problem, but I am afraid to drive on the freeway or at fast speeds because I have no cause for the brake failure. I am thankful I was not going fast, otherwise the only way to slow the car would be to down shift and use the emergency brake. This part is also not warrantied, but I am surprised it is already failing before I have changed the brake pads, rotors, or drums. It is weird. Now I have to wait for the part to come from the plant? they do not even have it in stock. Is this a common problem? I will be asking for the old part, but am unsure if I will be able to see if the master cylinder is bad.