Part number 34211154448 is a classic brake hardware kit: the Rear Drum Brake Shoe Hold Down Hardware Pack (Mounting Parts Set).
(Note: In the United States, this hardware pack strictly fits the early two-door coupe and four-door sedan models of the base M10-powered 318i. When BMW re-introduced the 318i variant to North America for the 1990–1991 model years using the updated 16-valve M42 engine, the rear braking system was completely upgraded to standard rear brake discs, making this drum brake mounting hardware obsolete for those later vehicles).
Because drum brake retention relies on continuous physical compression, this kit is sold as a pre-packaged matched wheel set containing six internal service components:
- 2x Brake Shoe Retention Pins
- 2x Coil Hold Down Springs
- 2x Locking Top Plates / Cups
Service Tip: It requires one full kit per wheel (two kits per car total) to fully overhaul a rear axle. Because these small holding pins and springs are continually exposed to high heat and brake dust humidity cycles, they soften or corrode over time. It is highly recommended to replace this kit whenever you install fresh rear brake shoes to avoid shoe dragging or unwanted noise.
