- I usually rebuild the caliper myself using new boot and seal (ATE or FTE).

- Brake Hose: yes replace them (use only ATE or FTE etc.).

- Guide pin: clean with steel wool: Honda says grease it, BMW says do not. Who cares, just clean it and apply a tiny bit of grease. It gets dirty anyway with road debris etc. Once every 3-4y, clean the guide pins.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT