ID.4 2021 ➤
Brake system - Edition 07.2021
– Tighten break line union screws in sequence -1- through
-6- .
– Remove brake pedal actuator -V.A.G 1869/2- .
– ⇒ Rep. gr. 47; Bleed hydraulic system following standard
procedure .
– If the control unit has been renewed, conclude the test plan
for the renewal of the control unit using ⇒ Vehicle diagnostic
tester .
Tightening torques
Assembling special tools for tightening brake lines
1 - Torque wrench -VAS 6854-
2 - Universal joint -V.A.G 1410/7-
3 - 11 mm open ring spanner insert -V.A.G 1410/6-
♦ ⇒ Rep. gr. 45; Assembly overview – control unit and hydraul‐
ic unit
♦ ⇒ Rep. gr. 46; Assembly overview – front brake
♦ ⇒ Rep. gr. 46; Assembly overview – brake shoes
♦ ⇒ Electrical system; Rep. gr. 27; Battery; Assembly over‐
view – battery
3.3
Connecting brake lines to hydraulic
unit
3.3.1
Connecting brake lines to hydraulic unit, left-hand drive vehicles
To hydraulic unit:
22
Rep. gr.45 - Anti-lock brake system
ID.4 2021 ➤
Brake system - Edition 07.2021
1 - Hydraulic unit to rear right
wheel brake cylinder
❑ 5.25 mm in diameter
and union screw with
short M12 × 1 thread
❑ Specified torque
⇒ Rep. gr. 45; Assem‐
bly overview – control
unit and hydraulic unit
2 - From hydraulic unit to front
left brake caliper
❑ 5.25 mm in diameter
and union screw with
M10 × 1 thread
❑ Specified torque
⇒ Rep. gr. 45; Assem‐
bly overview – control
unit and hydraulic unit
3 - From hydraulic unit to front
right brake caliper.
❑ 5.25 mm in diameter
and union screw with
short M12 × 1 thread
❑ Specified torque
⇒ Rep. gr. 45; Assem‐
bly overview – control unit and hydraulic unit
4 - Hydraulic unit to rear left wheel brake cylinder
❑ 5.25 mm in diameter and union screw with M10 × 1 thread
❑ Specified torque ⇒ Rep. gr. 45; Assembly overview – control unit and hydraulic unit
5 - From hydraulic unit to secondary piston circuit of brake master cylinder.
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ Specified torque ⇒ Rep. gr. 45; Assembly overview – control unit and hydraulic unit
6 - From hydraulic unit to primary piston circuit of brake master cylinder
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ Specified torque ⇒ Rep. gr. 45; Assembly overview – control unit and hydraulic unit
On brake master cylinder:
3. Control unit and hydraulic unit
23
ID.4 2021 ➤
Brake system - Edition 07.2021
1 - Brake servo and brake
master cylinder
2 - Secondary piston circuit of
brake master cylinder to hy‐
draulic unit
❑ Specified torque
⇒ Rep. gr. 47; Assem‐
bly overview – brake
servo/brake master cyl‐
inder
3 - Primary piston circuit of
brake master cylinder to hy‐
draulic unit
❑ Specified torque
⇒ Rep. gr. 47; Assem‐
bly overview – brake
servo/brake master cyl‐
inder
3.3.2
Connecting brake lines to hydraulic unit, right-hand drive vehicles
To hydraulic unit:
24
Rep. gr.45 - Anti-lock brake system
ID.4 2021 ➤
Brake system - Edition 07.2021
1 - Hydraulic unit to rear right
wheel brake cylinder
❑ 5.25 mm in diameter
and union screw with
short M12 × 1 thread
❑ Specified torque
⇒ Rep. gr. 45; Assem‐
bly overview – control
unit and hydraulic unit
2 - From hydraulic unit to front
left brake caliper
❑ 5.25 mm in diameter
and union screw with
M10 × 1 thread
❑ Specified torque
⇒ Rep. gr. 45; Assem‐
bly overview – control
unit and hydraulic unit
3 - From hydraulic unit to front
right brake caliper.
❑ 5.25 mm in diameter
and union screw with
short M12 × 1 thread
❑ Specified torque
⇒ Rep. gr. 45; Assem‐
bly overview – control unit and hydraulic unit
4 - Hydraulic unit to rear left wheel brake cylinder
❑ 5.25 mm in diameter and union screw with M10 × 1 thread
❑ Specified torque ⇒ Rep. gr. 45; Assembly overview – control unit and hydraulic unit
5 - From hydraulic unit to secondary piston circuit of brake master cylinder.
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ Specified torque ⇒ Rep. gr. 45; Assembly overview – control unit and hydraulic unit
6 - From hydraulic unit to primary piston circuit of brake master cylinder
❑ 6 mm in diameter and union screw with M12 × 1 thread
❑ Specified torque ⇒ Rep. gr. 45; Assembly overview – control unit and hydraulic unit
7 - Clip on bracket
8 - Hydraulic unit
On brake master cylinder:
3. Control unit and hydraulic unit
25
ID.4 2021 ➤
Brake system - Edition 07.2021
1 - Brake servo and brake
master cylinder
2 - Secondary piston circuit of
brake master cylinder to hy‐
draulic unit
❑ Specified torque
⇒ Rep. gr. 47; Assem‐
bly overview – brake
servo/brake master cyl‐
inder
3 - Primary piston circuit of
brake master cylinder to hy‐
draulic unit
❑ Specified torque
⇒ Rep. gr. 47; Assem‐
bly overview – brake
servo/brake master cyl‐
inder
26
Rep. gr.45 - Anti-lock brake system
2024 VW ID.4 Owner's Manual
