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II. Removal and Installation
1. Spare Part Supply Status
① Differentiation between Dry Type HECU and Wet Type HECU
The biggest differentiation between the dry type HECU and wet type HECU is that the no air
discharge is conducted in the 2nd circuit (namely the circuit from the normal close valve to the
general pump) of the dry type HECU. Therefore, when the spare part is of wet type HECU, it’s
only necessary to conduct the air discharge and oil refill in accordance with the regular brake
system after the replacement. When the spare part is of dry type HECU, besides that the air
discharge and oil refill are required in accordance with the regular brake system after the
replacement, it’s necessary to conduct the air discharge and oil refill to the 2nd circuit of the HECU.
In addition, for the appearance, the wet type HECU has the bolts for sealing purpose and the dry
type HECU has the protection film. The product label located on the motor is marked with the part
number of the products, through which the dry type HECU and wet type HECU can be
differentiated.
Take the S21 model for instance, the dry type Mando product number is BH601-086-00 and the wet
type Mando product number is BH602-386-00.
Dry Type Wet Type
② Notices
If the bolts on the wet type HECU are fallen off (such as during the transportation), besides that the
air discharge and oil refill must be conducted for 1st circuit, maybe it’s necessary to conduct the air
discharge and oil refill to the 2nd circuit.
2． Notices for Removal and Installation
① Notices for HECU Assembling
During the assembling of brake pipeline:
† Remove the protection film attached onto the HECU
before the operation.
† Confirm the pipeline of general pump and wheel branch
pump before the operation.
(General pump: MCP, MCS Wheel branch pump: FR,
FL, RR, RL)
† Confirm if the brake hose is tightened to 120~160
kgf·cm with special tool or torque wrench.
† Notice to keep away the impurity ingress into the
HECU hole and brake hose during operation.
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