diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 457df5fc7b..cd55cdf4cb 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -1565,6 +1565,9 @@ class ResourceAuditor
 
       strategy = DownloadStrategyDetector.detect(url, using)
       if strategy <= CurlDownloadStrategy && !url.start_with?("file")
+        # A `brew mirror`'ed URL is usually not yet reachable at the time of
+        # pull request.
+        next if url =~ %r{^https://dl.bintray.com/homebrew/mirror/}
         if http_content_problem = FormulaAuditor.check_http_content(url)
           problem http_content_problem
         end
diff --git a/Library/Homebrew/dev-cmd/pull.rb b/Library/Homebrew/dev-cmd/pull.rb
index 98a62e5780..1bc87add1e 100644
--- a/Library/Homebrew/dev-cmd/pull.rb
+++ b/Library/Homebrew/dev-cmd/pull.rb
@@ -155,6 +155,13 @@ module Homebrew
           next
         end
 
+        if f.stable
+          stable_urls = [f.stable.url] + f.stable.mirrors
+          stable_urls.grep(%r{^https://dl.bintray.com/homebrew/mirror/}) do |mirror_url|
+            check_bintray_mirror(f.full_name, mirror_url)
+          end
+        end
+
         if ARGV.include? "--bottle"
           if f.bottle_unneeded?
             ohai "#{f}: skipping unneeded bottle."
@@ -588,4 +595,12 @@ module Homebrew
       end
     end
   end
+
+  def check_bintray_mirror(name, url)
+    headers = curl_output("--connect-timeout", "15", "--head", url)[0]
+    status_code = headers.scan(%r{^HTTP\/.* (\d+)}).last.first
+    return if status_code.start_with?("3")
+    opoo "The Bintray mirror #{url} is not reachable (HTTP status code #{status_code})."
+    opoo "Do you need to upload it with `brew mirror #{name}`?"
+  end
 end