Opel Frontera UE. Manual - part 128

5B–2

ANTI-LOCK BRAKE SYSTEM

Electronic Hydraulic Control Unit

Electronic Hydraulic Control Unit and Associated Parts

350RW017

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Removal

1. Remove brake pipes.

• After disconnecting brake pipe, cap or tape the 

openings of the brake pipe to prevent the entry of 
foreign matter.

2. Remove three bracke fixing bolts.

3. Disconnect red clip from harness connector.

350RW018

(1) EHCU
(2) Bolt

(3) Bracket
(4) Bolt and Nut

ANTI-LOCK BRAKE SYSTEM

5B–3

4. Remove harness connector.

5. Remove EHCU ASM.

6. Remove EHCU.

Disassembled View

350RW025

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Disassembly

1. Remove fixing bolts from EHCU.

2. Remove coil integrated module from hydraulic unit.

Reassembly

To reassembly, follow the disassembly steps in the 
reverse order, noting the following points:

Torque:

Fixing bolts: 4.4 N·m (4.5 kg·cm/39 lb in)

Installation

To install, follow the removal steps in the reverse order, 
noting the following points:

Torque:

Hydraulic unit fixing nuts : 22 N·m (2.2 kg·m/16 

lbft)

Ground cable : 14 N·m (1.4 kg·m/10 lbft)

Brake pipe (joint bolts) : 16 N·m (1.6 kg·m/12 lbft)

• After installing the hydraulic unit, bleed brakes 

completely.  See Hydraulic Brakes in Power–assisted 
brake system section.

(1) Fixing Bolts
(2) Coil Integrated Module
(3) Hydraulic Unit (H/U)

5B–4

ANTI-LOCK BRAKE SYSTEM

Front Wheel Speed Sensor

Front Wheel Speed Sensor and Associated Parts

350RS033

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Removal

1. Remove speed sensor connector.

2. Remove sensor cable fixing bolt (Upper side).

3. Remove sensor cable fixing bolt (Lower side).

4. Remove the speed sensor cable fixing bolt.

5. Remove speed sensor.

Inspection and Repair

1. Check the speed sensor pole piece for presence of 

foreign materials; remove any dirt, etc.

2. Check the pole piece for damage; replace speed 

sensor if necessary.

3. Check the speed sensor cable for short or open 

circuit, and replace with a new one if necessary.
To check for cable short or open, bend or stretch the 
cable while checking for continuity.

4. Check the sensor ring for damage including tooth 

chipping, and if damaged, replace the sensor ring 

assembly.   Refer to removal of the sensor ring in 
Section 4D “Front hub and disc".

Installation

1. Install speed sensor and take care not to hit the 

speed sensor pole piece during installation.

2. Install speed sensor fixing bolt and tighten the fixing 

bolt to the specified torque.

Torque: 7 N·m (0.7 kg·m/61 lbin)

3. Install speed sensor cable fixing bolt (Lower side) 

and tighten the fixing bolt to the specified torque.

Torque : 20 N·m (2.0 kg·m/14 lbft)

4. Install speed sensor cable fixing bolt (Upper side) 

and tighten the fixing bolt to the specified torque.

Torque : 6 N·m (0.6 kg·m/52 lbft)

NOTE:  Confirm that a white line marked on the cable is 
not twisted when connecting the speed sensor cable.

5. Install speed sensor connector.

(1) Speed Sensor Connector
(2) Sensor Cable Fixing Bolt (Upper side)
(3) Sensor Cable Fixing Bolt (Lower side)

(4) Speed Sensor Fixing Bolt
(5) Speed Sensor

ANTI-LOCK BRAKE SYSTEM

5B–5

Rear Wheel Speed Sensor

Removal

1. Disconnect harness connector (1).

2. Remove sensor fixing bolt (2) .

3. Remove speed sensor (3).

350RX003

Inspection and Repair

1. Check speed sensor pole piece for presence of 

foreign materials; remove any dirt, etc.

2. Check the pole piece for damage, and replace 

speed sensor if necessary.

3. Check speed sensor cable for short or open, and 

replace with a new one if necessary.   To check for 
cable short or open, bend or stretch the cable while 
checking for continuity.

4. Check the sensor ring for damage including tooth 

chipping, and if damaged, replace the axle shaft 
assembly.   Refer to removal of the sensor ring in 
Section 4A2 “Differential (Rear)".

Installation

1. Install speed sensor (3).

2. Tighten the sensor fixing bolt (2) to the specified 

torque.

Torque : 24 N·m (2.4 kg·m/17 lbft)

3. Connect harness connector (1).

350RX003