Legacy GT:Fourth generation (2003–2009) – BL, BP/Rear Brake Line Corrosion

Symptoms

Loss in braking
Brake light illuminating
Fluid dripping in the rear right side of the vehicle.

Rusty Rear Brake Line 1
Rusty Rear Brake Line 2
Rear Brake Line Leak From Outside Car

Fixes

Subaru Official

[Recall WQK47 From nhtsa] Subaru will inspect the brake line for leaking if it is not leaking it will apply a thick waxy substance to slow down the leaking. In practice this slows down the corrosion at best, many reports from users of failure after the recall is performed. If there is a current leak they will replace the leaking parts.

After the recall is performed, if the leak does occur, most dealers will refuse to replace the brake lines under warranty.

DIY

Parts Needed

Brass Brake Line Union, 3/16 (M10x1.0 Inverted) Amazon Link
25 ft 3/16 True Copper-Nickel Alloy Brake Line Replacement Tubing Amazon Link
Stainless Steel Brake Line Tube Nut, 3/16 (M10x1.0 Bubble) Amazon Link
Double Flaring Tool Kit for 3/16"-5/8" 7 Dies Automotive Brake Line Tube Cutter with Replacement Blade and Reamer Amazon Link
(Optional but helpful) Tubing Bender Tool 3/16 and 1/4 Brake, Fuel Line Handheld Amazon Link

Instructions

I managed to run the left rear brake line over the front of the tank by removing the two access panels under the seat. I drilled two holes near the covers and attached the above mentioned clamps via stainless machine screws and nuts/ lock washers underneath. I also put the line through a 18" rubber hose that I located between the access covers (just in case something rubs).

Secured the line where you can with the stainless clamps and self taping screws. Bleed the system a few times and knock on wood, no leaks and car stops again.

Optional, spray everything with fluid film before putting everything back together.