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The HydraStar should have the brake fluid bled upon installation, and then again after seven days of usage. Make sure to keep the brake fluid topped off, especially when bleeding the brakes.
As with all hydraulic fluid, it should probably be drained and refilled on a regular maintenance schedule. You're correct, the manual does not discuss maintenance. I'd recommend a purge and flush of the fluid every 2-3 years.
Jim
Jim and Ginnie
2024 Solitude 310GK - 2020 F350 Dually
GDRV Technical Forum Moderator
GDRV Rally Support Coordinator
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