Unbolt relevant brake line at brake caliper or wheel brake cylinder; catch escaping brake fluid and dispose of this as per regulations.
Cut through brake line at a suitable point (straight, freely accessible section) using pipe cutter -2-.
Remove section to be renewed.
Degrease brake line surface.
Clamp brake line in set of grips -4- so that approx. 50 mm project from plastic jaws.
Clamp scraper -3- into a drill and place it onto brake line.
At slow drill speed and with gentle pressure on brake line, scrape coating off brake line.
Length of scraping is determined by stop in scraper.
Pull scraper off brake line and remove scrapings.
Remove grip wrench and slide brake line nut -D- onto brake line.
Slide brake line -B- up to stop -A- in flanging tool.
Note Brake line must be positioned against stop when the hexagon socket head bolts are tightened, or the flange will not be formed correctly.
Clamp brake line in flanging tool until brake line can no longer be moved. Fold up stop -A-, then tighten hexagon socket head bolts diagonally using angle screwdriver -C-.
Turn spindle as far as stop in flanging tool.
Turn spindle back again.
Unscrew hexagon socket head bolts in diagonal sequence.
Remove brake line from flanging tool, then clean and inspect brake line and flange.
Briefly flush the section of brake line remaining in the vehicle:
Connect brake filling and bleeding unit -VAS 5234-, connect hose of bleed bottle to brake line flange and allow brake filling and bleeding unit -VAS 5234- to run briefly until a little brake fluid has run through.
Blow out new brake line to be inserted with compressed air.
Join brake lines using connector -E-.
Install brake line.
Bleed brake system → Chapter.
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Test yourself
A quick Volkswagen Golf quiz: every answer comes with an explanation and a link to the manual page.
Note Brake line must be positioned against stop when the hexagon socket head bolts are tightened, or the flange will not be formed correctly. 
