Assembly overview, ABS/EDL/TCS/ESP Mark 20 IE - hydraulic unit, brake servo/brake master cylinder — VW
Assembly overview, ABS/EDL/TCS/ESP Mark 20 IE - hydraulic unit, brake servo/brake master cylinder on VW: factory workshop procedure.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📋 Procedure
ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.
Assembly overview, ABS/EDL/TCS/ESP Mark 20 IE - hydraulic unit, brake servo/brake master cylinder
1
Brake servo
Allocation
Electronic Parts Catalogue
.
On petrol engines, the required vacuum is taken from the intake manifold.
On diesel engines an exhauster pump is installed to generate vacuum.
Functional check:
With engine switched off, depress brake pedal firmly several times. (This will release the vacuum in the unit.)
Now step on and hold brake pedal with medium pressure and start engine. If the brake servo is functioning properly, the brake pedal will be felt to go down as the servo takes effect.
If faulty renew complete.
Checking non-return valve (in vacuum hose)
Chapter
Removing and installing
Chapter
.
2
Brake fluid reservoir
3
Cap
4
Self-locking hexagon nut, 20 Nm
5
Sealing plug
Coat with brake fluid and press into expansion reservoir
6
Retainer pin
Insert through brake master cylinder
7
Self-locking hexagon nut, 20 Nm
8
Fitted bolt, 8 Nm
9
Rubber damper
10
Bracket
11
ABS/EDL/TCS/ESP hydraulic unit
12
ABS/EDL/TCS/ESP control unit
Do not detach connector before self-diagnosis
Cannot be repaired. If faulty, renew complete.
13
Bolt, torx head E 5, 4 Nm
14
Connection for brake line
From hydraulic unit to front left brake caliper.
15
Connection for brake line
Hydraulic unit to rear right wheel cylinder
16
Connection for brake line
Hydraulic unit to rear left wheel cylinder
17
Connection for brake line
Hydraulic unit to front right brake caliper.
18
Brake line
Brake master cylinder/primary piston circuit to hydraulic unit.
19
Mounting plate
Used to secure the wiring harness
20
Brake line
Master brake cylinder/secondary piston circuit to hydraulic unit.
21
Brake pressure sender -G201
1
Removing and installing
Chapter
.
22
Brake pressure sender -G214
2
Removing and installing
Chapter
.
23
Brake master cylinder
Cannot be repaired. If faulty, renew complete.
Removing and installing
Chapter
.
24
Sealing ring
Renew.
25
Vacuum hose
Insert into brake servo unit.
26
Opening for cables
Brake pressure solenoid trip switch
F84
Brake pressure solenoid
N247
27
Sealing plug
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.