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All Technical Service Bulletins for Brake Fluid Pump: > < Diagram Information and Instructions|Page 3248
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Brake Fluid Pump: Customer Interest
ABS Brakes - Hydraulic Pump, Supply Line Overheating

August 11, 1992

Model
911 C4/T

Part Identifier
4554

Group
4

Number
9206

Subject:
Relay for Hydraulic Brake Pump

ATTENTION:
Service Manager/Service Technician

Models Affected:
911 Carrera 4, 1989-on 
911 Turbo, 1991-on

Concern:
Possible relay sticking in the on position causing hydraulic pump and supply line to overheat. (See Figure B for possible affected parts.).

Work Procedure:
When repairing pump or supply line, always replace the relay along with the affected parts.

Parts Information:
Brake Pump Relay Part Number 964 615 135 00 
Location (Figure A) 
R51 in central electric board

All Technical Service Bulletins for Brake Fluid Pump: > < Diagram Information and Instructions|Page 3248