Dismantling and assembling hydraulic unit (ABS/EDL) — VW
Dismantling and assembling hydraulic unit (ABS/EDL) on VW: factory workshop procedure. Full factory text, tools and checks.
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.
VW
Golf
1984
Jetta
1984
Running gear
Running gear
Edition
11.2005
Dismantling and assembling hydraulic unit (ABS/EDL)
Note
Expansion tank, pressure accumulator and pressure warning switch can be renewed with hydraulic unit installed. Hydraulic unit must be removed completely for all other work.
Servo with tandem brake master cylinder
Removing and installing hydraulic unit complete
Chapter
.
Brake pipe connection
Front right brake caliper
Brake pipe connection
Front left brake caliper
Brake pipe connection
Brake pressure regulator
Pressure control valve
Installed in vehicles with rear disc brakes (not rear drum brakes).
Opens to rear axle as of approx. 8 bar, cannot be checked with workshop equipment.
Cap for expansion tank
With tank warning facility.
Expansion tank
Supplied with fastening kit.
Can be renewed with unit installed.
Sleeve
Renew, mounted on expansion tank.
Remove old sleeve from brake servo.
O-ring
Renew, mounted on expansion tank.
Remove old O-ring from brake servo.
Sealing plug
Renew, coat with brake fluid.
Sleeve for securing reservoir
Renew, mounted on expansion tank.
Hexagon bolt, 10 Nm
Pressure accumulator, 45 Nm
Can be renewed with hydraulic unit installed.
Supplied as spare part with O-ring installed.
Coat O-ring with brake fluid before installing.
Brake hose with damper weight (rubber part)
From hydraulic pump to EDL valve block.
Hydraulic pump
Renewing
If damaged, also renew relay for hydraulic pump.
Connection hose
Hydraulic pump to expansion tank.
Pressure warning switch, 25 Nm
Can be renewed with hydraulic unit installed
Chapter
.
Supplied as spare part with rubber ring installed.
Coat rubber ring with brake fluid before installing.
Up to 12.89 installed in servo with tandem brake master cylinder
Item
, as of 01.90 installed in hydraulic pump
Item
.
Note
A rubber ring (rectangular profile) is located in bore for pressure warning switch. Before installing pressure warning switch, check correct rubber ring seating, renew rubber ring if necessary. Rubber ring is supplied with pressure warning switch.
Hexagon nut, 25 Nm
ABS valve block
ABS valve block seal
Renew.
Cover
Renew.
Hexagon bolt, 25 Nm
EDL valve block
EDL valve block seal
Renew.
Mounting bracket
Hexagon bolt, 25 Nm
Hexagon nut, 25 Nm
Gasket
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.