Brake system fails while driving. Brakes go soft on car while in use and unable to brake properly. Warning lights and abs brake light comes on the dashboard. This has occurred 4 different times. Each occurrence was followed with several months long repair visits to the dealer who says it-??s the brake pump malfunctioning. I have lost control of brakes while driving. Two cases have been directly reported to General Motors.

- Bronx, NY, USA

Brake failure after $560 brake repair. When backing up on an incline brakes became very hard and fail to stop the car. Happened multiple times with no warning light. Dealer talked with GM, and informed me it may not be fixable. The brakes should stop the car even with a power assist malfunction. Poor design. Too unsafe for my family. Traded it in. Hope NHTSA investigates the brakes on Chevy Sparks. The total loss of brakes was verified on first shop trip by Chevy tech. 1 day after repair, total brake failure again. This time it set in the shop for a week, awaiting GM response. GM case number 9-6003224546 this is the second brake failure complaint for the car, but I only have the service report for the original failure and repair. Document is provided with this complaint.

- Derby, KS, USA

Randomly while parked on incline, start the car, put in reverse, and start backing down the drive way the brakes would totally fail and no amount of pressing on the brakes would stop the car. The car gave no brake failure warnings.

- Derby, KS, USA

Got a "service stable track" indication and brakes would lose assisted power randomly while driving down the road. (which is not very safe.) before this I had a similar problem with loosing assisted brakes after stopping that dealer replaced the brake booster just after I bought it. This time I took it back to the dealer I bought it from and the computer was throwing lots of weird codes. So they took it to the Chevy dealer and they determined that the bolts that mount the ebcm to the bpmv were loose. They decided that the bolts weren't tightened enough from a warranty repair on the bpmv that I didn't realize was done less than two years ago since I bought the car used. Technically I feel like we don't really know for sure if the bolts were tightened to the correct torque in the first place or not. I have seen a number of brake problems reported on this model. It sounds like the issue could cause false codes to be reported because the ebcm is not grounded well and also causes air getting into the brake system. My concern is this might not be an isolated incident, but I don't know for sure.

- Longmont, CO, USA