Expert Answers about Hummer H3

• Where Does the Air Used By the Roadmaster InvisiBrake # RM-8700 Come From
• The Roadmaster InvisiBrake you referenced, part # RM-8700 has a small compressor in the control box that provides the necessary air pressure to actuate the towed vehicles brakes when needed. Although the box is typically mounted under the seat, it can be mounted anywhere in the vehicle that allows access to the adjustment knob. I have linked you to an install video showing the InvisiBrake being installed on a 2002 Jeep Liberty. Although the install is for a different vehicle than yours,...
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• Describe Retention Devices Referenced in Instructions for WeatherTech Front Floor Liners # WT450341
• The factory retention devices mentioned in the installation instructions for WeatherTech floor liners WT450341 would be small knobs in the front floorboards of the vehicle. Some, but not all vehicles are equipped with these. If your 2007 Hummer H3 does have the knobs, they should be toward the outer left on the driver side or outer right on the passenger side. Basically, the small knobs fit into a hole in the factory mats to secure them and keep them from sliding around. You can view...
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