ID.4 2021 ➤
Brake system - Edition 07.2021
2
Brake servo and brake master cylin‐
der
2.1
Assembly overview – brake ser‐
vo/brake master cylinder
2.1.1
Assembly overview – brake servo/brake master cylinder, left-hand drive
vehicles
68
Rep. gr.47 - Brakes - hydraulics
ID.4 2021 ➤
Brake system - Edition 07.2021
1 - Brake line
❑ Brake master cylin‐
der/secondary piston
circuit to hydraulic unit
❑ M12 × 1
❑ mit Standardwerkzeug:
14 Nm
❑ With special tools
VAS 6854, VAG 1410/7
and VAG 1410/6:
12 Nm
2 - Brake line
❑ Brake master cylin‐
der/primary piston cir‐
cuit to hydraulic unit
❑ M12 × 1
❑ mit Standardwerkzeug:
14 Nm
❑ With special tools
VAS 6854, VAG 1410/7
and VAG 1410/6:
12 Nm
3 - Brake fluid level warning
contact -F34-
4 - Cap
5 - Brake fluid reservoir
6 - Bolt
❑ 4 Nm
7 - Brake servo -NX6-
❑ With brake servo con‐
trol unit -J539-
❑ With brake pedal posi‐
tion sender -G100-
❑ With brake pedal position sender 2 -G836-
❑ ⇒ Rep. gr. 47; Removing and installing brake servo
8 - Gasket for brake servo
❑ Renew after removing
9 - Nut
❑ Qty. 2
❑ Renew after removing
❑ 25 Nm
10 - Mounting bracket with brake pedal
❑ ⇒ Rep. gr. 46; Assembly overview – brake pedal
❑ ⇒ Rep. gr. 46; Removing and installing mounting bracket
11 - Seal
❑ Renew after removing
12 - Brake master cylinder
❑ Cannot be renewed individually
13 - Bolt
❑ Qty. 2
❑ Renew after removing
2. Brake servo and brake master cylinder
69
ID.4 2021 ➤
Brake system - Edition 07.2021
❑ 22 Nm
14 - Sealing plug
2.1.2
Assembly overview – brake servo/brake master cylinder, right-hand drive
vehicles
70
Rep. gr.47 - Brakes - hydraulics
ID.4 2021 ➤
Brake system - Edition 07.2021
1 - Cap
2 - Brake fluid reservoir
3 - Stud
❑ 4 Nm
4 - Brake servo -NX6-
❑ With brake servo con‐
trol unit -J539-
❑ With brake pedal posi‐
tion sender -G100-
❑ With brake pedal posi‐
tion sender 2 -G836-
❑ ⇒ Rep. gr. 47; Remov‐
ing and installing brake
servo
5 - Gasket for brake servo
❑ Renew after removing
6 - Mounting bracket with
brake pedal
❑ ⇒ Rep. gr. 46; Assem‐
bly overview – brake
pedal
❑ ⇒ Rep. gr. 46; Re‐
moving and installing
mounting bracket
7 - Nut
❑ Qty. 2
❑ Renew after removing
❑ 25 Nm
8 - Seal
❑ Renew after removing
9 - Brake master cylinder
❑ Cannot be renewed individually
10 - Bolt
❑ Renew after removing
❑ 22 Nm
11 - Brake line
❑ Brake master cylinder/secondary piston circuit to hydraulic unit
❑ M12 × 1
❑ mit Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
12 - Brake line
❑ Brake master cylinder/primary piston circuit to hydraulic unit
❑ M12 × 1
❑ mit Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
13 - Bolt
❑ Qty. 2
❑ Renew after removing
❑ 22 Nm
2. Brake servo and brake master cylinder
71
ID.4 2021 ➤
Brake system - Edition 07.2021
14 - Sealing plug
15 - Brake fluid level warning contact -F34-
2.2
Removing and installing brake servo
2.2.1
Removing and installing brake ser‐
vo [NX6], left-hand drive vehicles
Special tools and workshop equipment required
♦ 11 mm open ring spanner insert -V.A.G 1410/6-
♦ Socket set, 39-piece -VAS 6928-
♦ Torque wrench -VAS 6854-
♦ Universal joint -V.A.G 1410/7-
♦ assembly tool -V.A.G 1410/8-
♦ brake filling and bleeding equipment -VAS 6860-
♦ engine bung set -VAS 6122-
♦ hot air blower -VAS 1978/14A-
The brake servo -NX6- will henceforth be referred to as “brake
servo”.
For sealing plugs (assembly parts), see electronic parts cata‐
logue (ETKA)
1 - M10 sealing plugs
2 - M12 sealing plugs
Removing
– If the brake servo control unit -J539- is renewed, carry out
the test plan for the renewal of the brake servo control unit
-J539- using ⇒ Vehicle diagnostic tester .
– Remove battery tray ⇒ Electrical system; Rep. gr. 27; Bat‐
tery; Removing and installing battery tray .
– Remove air intake unit of heater and air conditioning unit
⇒ Heating, air conditioning system; Rep. gr. 87; Front heater
and air conditioning unit; Removing and installing air intake
unit of heater and air conditioning unit
– Extract as much brake fluid as possible from brake fluid res‐
ervoir -1- using brake filling and bleeding equipment -VAS
6860- -A- .
72
Rep. gr.47 - Brakes - hydraulics
2024 VW ID.4 Owner's Manual
