The brake reservoir that fit was: "Manual Transmission Brake Fluid Reservoir 2004-2008 Audi S4 RS4". SKU: 40643

After installation I did get air in my master cylinder which I was able to relieve by draining from the passenger brake cylinder (at the caliper at wheel), although I think it would be best if possible to PUMP the brake fluid UP from one of the wheel calipers until the reservoir is full, although IDK if this is possible, but it would push any bubbles UP and OUT rather than down, which I think is always better.

...as I always recommend (and yes get paid $0.20 for my recommendation, but would STILL recommend even if I was paid nothing)...be sure to use a plastic protectant/rejuvinator on your weather seals and ANY exposed plastic or rubber surface. [ Ссылка ]
...It's one of the best things I've learned, as it prevents your bushings/CV bellows/belts, etc, from drying out due to UV, ozone, and oxygen exposure. Spraying or wiping down 2-4 times per year will add many years of life to these plastic components.

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