TSB 8901: Brakes - Lubricate During Repair for Brake Pulling

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89porsche04 Technical Bulletin Subject: Brake Pulling/ Brake Caliper Sliding Lubricant Model Group All 4 Part Identifier Number 4739/4741 8901 ATTENTION: This Technical Bulletin replaces Bulletin Number 8901, Group 4, dated March 17, 1989. When repairing a vehicle for brake pulling, especially 944 Turbo, 911 Turbo and 911 Turbo look, and no mechanical or hydraulic brake system or suspension defects are evident, proceed as follows: 1. Remove front brake calipers and brake pads . 2. Remove caliper pistons with compressed air. Do not separate the two halves of the caliper. 3. Remove sealing rings and clean pistons and cylinders. 4. Assemble calipers with new sealing rings and dust caps/scraper rings. Important: A light coat of heat resistant silicon sliding lubricant must be applied to the cylinder bore, piston and sealing ring, (arrows in figure) when assembling brake calipers . Sliding lubricant: PN 000 043 117 00 (50 gram tube, sufficient for several applications). Refer to appropriate workshop manual for brake caliper repair instructions. Page 1 of 1 April 21, 1989