Exactly where is the brick located? I've never heard of a manufactured home having real brick on the exterior, as there'd be a tendency for things to work loose and bounce off as the home is being hauled down the road at 60 mph. Could you take a few pix and post them?
Offhand, I can't think of any product that does what you're hoping for, with one possible exception. While serving my 25-year sentence with a state DOT, I supervised the application of hundreds of gallons of a 2- or 3-component liquid called high molecular weight methyl methacrylate, but only on flat (horizontal) concrete surfaces. The stuff is very low viscosity, enabling it to seep into cracks as small as 0.003" wide, but quickly sets up to form a hard and durable surface. You won't like the price (we were paying $65 a gallon in 500-gallon lots, 15 years ago), and I suspect smaller-sized kits might not be available. Also, its tendency to run down and off before sinking into your mortar could present problems.
If no other specific answers show up here, I'd suggest you contact some of the larger construction specialty supply places, such as Sika, Master Builders, Watson-Bowman, etc. (they all have technical service 800 numbers, and I think, "residential" divisions), and explain your situation. Sika made the HMWMM product we used the most of, and called it Sika Pronto 19.
