ID.4 2021 ➤
Brake system - Edition 07.2021
3
Control unit and hydraulic unit
3.1
Assembly overview – control unit and
hydraulic unit
3.1.1
Assembly overview – control unit and hydraulic unit, left-hand drive vehi‐
cles
10
Rep. gr.45 - Anti-lock brake system
ID.4 2021 ➤
Brake system - Edition 07.2021
1 - ABS control unit -J104-
❑ ⇒ Rep. gr. 45; Remov‐
ing and installing ABS
control unit [J104]/ABS
hydraulic unit [N55]
2 - Brake line to rear right
wheel brake cylinder
❑ 5.25 mm in diameter
and union screw with
short M12 × 1 thread
❑ mit handelsüblichem
Standardwerkzeug:
14 Nm
❑ With special tools
VAS 6854, VAG 1410/7
and VAG 1410/6:
12 Nm
3 - Brake line to front left
brake caliper
❑ 5.25 mm in diameter
and union screw with
M10 × 1 thread
❑ mit handelsüblichem
Standardwerkzeug:
14 Nm
❑ With special tools
VAS 6854, VAG 1410/7
and VAG 1410/6:
12 Nm
4 - Brake line to front right
brake caliper
❑ 5.25 mm in diameter
and union screw with
short M12 × 1 thread
❑ mit handelsüblichem
Standardwerkzeug:
14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
5 - Brake line to rear left wheel brake cylinder
❑ 5.25 mm in diameter and union screw with M10 × 1 thread
❑ mit handelsüblichem Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
6 - ABS hydraulic unit -N55-
❑ ⇒ Rep. gr. 45; Removing and installing ABS control unit [J104]/ABS hydraulic unit [N55]
7 - Torx bolt
❑ Qty. 4
❑ Renew after removing
❑ 1st stage: 1.25 Nm (to allow seal to settle)
❑ 2nd stage: 2.5 Nm
8 - Brake line to secondary piston circuit of brake master cylinder
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ mit handelsüblichem Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
9 - Brake line to primary piston circuit of brake master cylinder
3. Control unit and hydraulic unit
11
ID.4 2021 ➤
Brake system - Edition 07.2021
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ mit handelsüblichem Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
10 - Rubber mounting
11 - Bracket
12 - Brake servo -NX6-
❑ Checking: ⇒ Vehicle diagnostic tester
❑ ⇒ Rep. gr. 47; Assembly overview – brake servo/brake master cylinder
❑ ⇒ Rep. gr. 47; Removing and installing brake servo
13 - Bolt
❑ Qty. 3
❑ 20 Nm
14 - Bracket
15 - Bolt
❑ Qty. 2
❑ 8 Nm
3.1.2
Assembly overview – control unit and hydraulic unit, right-hand drive
12
Rep. gr.45 - Anti-lock brake system
ID.4 2021 ➤
Brake system - Edition 07.2021
1 - Brake line to rear right
wheel brake cylinder
❑ 5.25 mm in diameter
and union screw with
short M12 × 1 thread
❑ mit handelsüblichem
Standardwerkzeug:
14 Nm
❑ With special tools
VAS 6854, VAG 1410/7
and VAG 1410/6:
12 Nm
2 - Brake line to front left
brake caliper
❑ 5.25 mm in diameter
and union screw with
M10 × 1 thread
❑ mit handelsüblichem
Standardwerkzeug:
14 Nm
❑ With special tools
VAS 6854, VAG 1410/7
and VAG 1410/6:
12 Nm
3 - Brake line to front right
brake caliper
❑ 5.25 mm in diameter
and union screw with
short M12 × 1 thread
❑ mit handelsüblichem
Standardwerkzeug:
14 Nm
❑ With special tools
VAS 6854, VAG 1410/7
and VAG 1410/6:
12 Nm
4 - Brake line to rear left wheel brake cylinder
❑ 5.25 mm in diameter and union screw with M10 × 1 thread
❑ mit handelsüblichem Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
5 - Brake line to secondary piston circuit of brake master cylinder
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ mit handelsüblichem Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
6 - Brake line to primary piston circuit of brake master cylinder
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ mit handelsüblichem Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
7 - Bracket
8 - Bolt
❑ Qty. 2
❑ 20 Nm
9 - Bolt
❑ 20 Nm
3. Control unit and hydraulic unit
13
ID.4 2021 ➤
Brake system - Edition 07.2021
10 - Rubber mounting
11 - Bracket
12 - Bolt
❑ 8 Nm
13 - ABS control unit -J104- with ABS hydraulic unit -N55-
❑ ⇒ Rep. gr. 45; Removing and installing ABS control unit [J104]/ABS hydraulic unit [N55]
14 - Brake line from secondary piston circuit to hydraulic unit
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ mit handelsüblichem Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
15 - Brake line from primary piston circuit to hydraulic unit
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ mit handelsüblichem Standardwerkzeug: 14 Nm
❑ With special tools VAS 6854, VAG 1410/7 and VAG 1410/6: 12 Nm
16 - Brake servo -NX6-
❑ Checking: ⇒ Vehicle diagnostic tester
❑ ⇒ Rep. gr. 47; Assembly overview – brake servo/brake master cylinder
❑ ⇒ Rep. gr. 47; Removing and installing brake servo
3.2
Removing and installing ABS control
unit [J104]/ABS hydraulic unit [N55]
3.2.1
Removing and installing ABS control
unit [J104]/ABS hydraulic unit [N55],
left-hand drive vehicles
Special tools and workshop equipment required
♦ 11 mm open ring spanner insert -V.A.G 1410/6-
♦ Torque wrench -VAS 6854-
♦ Universal joint -V.A.G 1410/7-
♦ assembly tool -V.A.G 1410/8-
♦ brake pedal actuator -V.A.G 1869/2-
♦ engine bung set -VAS 6122-
For sealing plugs (assembly parts), see electronic parts cata‐
logue (ETKA)
14
Rep. gr.45 - Anti-lock brake system
2024 VW ID.4 Owner's Manual
