Section III Removal and Installation of ABS
I. Spare Parts Supply Condition
1. Difference between dry HECU and wet HECU (Fig. 3-8)
Dry Wet
Fig. 3-8
The biggest difference between dry HECU and wet HECU is the second circuit (between normally
closed valve and master pump) of dry HECU does not exhaust. As a result, only regular exhaust
and filling will be necessary for brake system after replacement in case of wet HECU; regular
exhaust and filling and that to the second circuit will be necessary for brake system after
replacement in case of dry HECU. Besides, there is a seal bolt for wet HECU and protection film
for dry HECU.
2. Notes
If the bolt on wet HECU is off (e.g. during transportation), regular exhaust and filling for brake
system is necessary for first circuit, but not necessary for the second circuit.
II. Notes on Removal and Installation
1. Notes on HECU installation
(1) Remove the protection film on HECU, and confirm pipelines of master pump and wheel slave
cylinder before operation (master pump: MCP and MCS; wheel slave cylinder: FR, FL, RR and
RL).
(2) Make sure the brake pipe is tightened and torque is 14N·m with a special tool, torque wrench or
other equipments.
(3) No foreign material is allowed in HECU holes and brake pipes, as shown in Fig. 3-9.
Fig. 3-9
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