HCU (Hydraulic Control Unit): Installation

NOTE: If the ABM is being replaced with a new ABM is must be reprogrammed with the use of a scan tool.

Fig 1: Antilock Brake Module & Hydraulic Control Unit

Courtesy of DAIMLERCHRYSLER CORP.

1 - ABM

2 - HCU

1. Install the 3 ABM (1) mounting bolts to the HCU (2) if removed tighten mounting bolts to 12 N.m (9 ft. lbs.).
   Fig 2: Identifying ABM/HCU Components

   Courtesy of DAIMLERCHRYSLER CORP.
2. Install the HCU (3) with bracket (5) to the vehicle and tighten the 2 mounting nuts.
   Fig 3: HCU Lines & Components

   Courtesy of DAIMLERCHRYSLER CORP.
3. Install the 4 chassis lines (3) at the HCU (4).
4. Install the secondary brake line at the HCU (4).
5. Install the secondary brake line at the master cylinder.
6. Install the primary brake line at the HCU (4).
7. Install the primary brake line at the master cylinder.
   Fig 4: Identifying ABM/HCU, Lines & Components

   Courtesy of DAIMLERCHRYSLER CORP.
8. Reconnect the HCU (4) electrical connector (5).
9. Install negative battery cable to the battery.
10. Remove the brake pedal prop rod.
11. Bleed base and ABS brake systems, (Refer to STANDARD PROCEDURE .