Dealer Service Information Bulletin 68-I-50 – Brake Drum Turning – Front Hub and Drum Assemblies – First Generation Firebird (1967, 1968, 1969)

Bulletin 68-I-50 — Pontiac Motor Division Dealer Service Information Bulletin, Section 5, dated March 19, 1968. Attention: Service Manager.

Subject: Brake Drum Turning — Front Hub and Drum Assemblies.

Short answer: When turning a front brake drum on a lathe, the drum must be torqued securely to the hub using five flat washers and five stud nuts torqued to 35 lb. ft., eliminating any movement between drum and hub during the turning operation.

When turning a front brake drum, install five flat washers and five stud nuts on the wheel studs and torque to 35 lb. ft. This mounting procedure eliminates any possibility of movement between the drum and hub during the turning operation.

See the figure in the original bulletin for the proper method of mounting the front hub and drum assembly on a drum lathe.

This is a transcription of the original dealer bulletin for easier reading and search. The complete original scan is shown below, including the figures.

Content last modified: June 13, 2026 at 10:06 am

Categories: Dealer Technical Bulletins, Dealer Technical Bulletins - Section 05 - Brakes, Wheels, Brakes, and Axle - All, Wheels, Brakes, and Axle - Brakes

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