Removing and installing brake system pressure accumulator -VX70-, RHD vehicles
In this manual: Brake system (hybrid)
~2min read
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-
Sealing plug -5Q0 698 311-
1 -
Sealing plug M10
2 -
Sealing plug M12
Location:
The brake system pressure accumulator -VX70- is located on left-hand side of the engine compartment.
1 -
Brake servo and brake master cylinder
2 -
Brake system pressure accumulator -VX70-
3 -
ABS control unit -J104- with ABS hydraulic unit -N55-
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.Risk of severe or fatal injury due to electric shock.The high-voltage system must be de-energised by a suitably qualified technician.
De-energise high-voltage system now → Electric drive; Rep. gr.93.
Remove coolant expansion tank from bracket. To do this, release catch -2- with a thin screwdriver.
Unscrew nut -2- and remove bracket -1-.
Move coolant hoses and electrical wiring away from the area of the brake system pressure accumulator -VX70-.
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 lines -2- from brake system pressure accumulator -VX70--1-.
To do this, unscrew union nuts -3-.
Seal threaded hole immediately using sealing plugs -1H0 698 311 A- or sealing plugs -5Q0 698 311-.
Fit dust caps from the brake caliper bleeder valves onto brake lines.
Release and pull off connector -4-.
Pull brake system pressure accumulator -VX70--1- together with bracket -3- and rubber dampers -2- upwards off bracket.
Installing:
Install in reverse order. Note the following points:
Ensure rubber dampers are seated correctly in bracket 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.
