Volkswagen Golf Service & Repair Manual: Removing and installing brake system pressure accumulator -VX70-, LHD vehicles

Special tools and workshop equipment required

Torque wrench -V.A.G 1331-

Removing and installing brake system pressure accumulator -VX70-, LHD vehicles

Torque wrench -V.A.G 1410-

Tool inserts (11 mm) -V.A.G 1331/2-

Brake filling and bleeding equipment -VAS 5234-

Sealing plug repair kit -1H0 698 311 A-

Fitting locations:

2 -	Brake servo and brake master cylinder

3 -	Brake system pressure accumulator -VX70-

Removing:

Observe safety precautions when working in the area of high-voltage components → Chapter.
Observe the risk classification of the high-voltage system → Electric drive; Rep. gr.00.

Danger to life due to high voltage

The high-voltage system is under high voltage. If high-voltage components are damaged, there is a risk of severe or fatal injury due to electric shock.

Carry out visual inspection of high-voltage components and cables.
Never use cutting or forming tools, or any others with sharp edges.
Never use heat sources such as welding, soldering, thermal bonding or hot air.

Disconnect battery → Electrical system; Rep. gr.27.
Remove power and control electronics for electric drive -JX1- → Electrical system; Rep. gr.93.
Remove bracket for power and control electronics for electric drive -JX1- → Electrical system; Rep. gr.93.
Draw off as much brake fluid as possible from brake fluid reservoir using brake filling and bleeding equipment -VAS 5234-.
Place sufficient lint-free cloths in the area of the brake system pressure accumulator -VX70--1-.

Unscrew brake line -1- from brake system pressure accumulator -VX70--2-.
Seal threaded hole immediately using sealing plugs -1H0 698 311 A-.
Fit a dust cap from the bleeder valve onto brake line.
Pull brake system pressure accumulator -VX70--2- together with bracket -4- and rubber dampers -5- upwards off bracket -6-.
Slightly tilt brake system pressure accumulator -VX70-, then release and pull off connector -3-.

Installing:

Install in reverse order. Note the following points:

Ensure rubber dampers -5- are seated correctly in bracket -4- of brake system pressure accumulator -VX70-.
Ensure that retaining pins have been fully and evenly inserted into rubber dampers.
Ensure secure seating by pulling.

Ensure that rubber dampers of retainer are not pressed out of bracket when installing. After installation, check that the brake system pressure accumulator -VX70- is securely seated, otherwise malfunction can occur.

Bleed brake system → Chapter.
Subsequently bleeding the brake system → Chapter.
Perform basic setting for electromechanical brake servo → Vehicle diagnostic tester.

Removing and installing brake system pressure accumulator -VX70-, LHD vehicles

Special tools and workshop equipment required

Torque wrench -V.A.G 1331-

Torque wrench -V.A.G 1410-

Tool inserts (11 mm) -V.A.G 1331/2-

Brake filling and bleeding equipment -VAS 5234-

Sealing plug repair kit -1H0 698 311 A-

Fitting locations:

Removing:

Danger to life due to high voltage

Installing:

Install in reverse order. Note the following points:

Specified torques

→ Chapter „Assembly overview - brake servo/brake master cylinder, LHD vehicles“

→ Chapter „Assembly overview – Brake system pressure accumulator -VX70-“

→ Electrical system; Rep. gr.93

→ Electrical system; Rep. gr.27.

Test yourself