Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
511869
According to GM Recall 24V702: "The brake lines in these cutaway vehicles may not meet the recommended clearance to the GM-provided body mounts. If brake lines contact the body mounts, the brake line may experience wear or damage that could lead to a brake fluid leak. A brake fluid leak can result in reduced stopping performance or inoperative service brakes, increasing the risk of a crash.
511891
According to FCA Recall 24V896: "The brake hydraulic control unit could fail. Over time, this could cause the antilock braking system (ABS), electronic stability control (ESC) system and/or traction control not to work. An antilock braking system, electronic stability control system and/or traction control system that doesn't work could increase the risk of a crash."
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.