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Discussion Starter #1
Does anyone know if the Dmax brake boost system is somehow tied to the power steering system? My truck has started to groan loudly on braking deceleration when the truck is running hot. My power steering system has been noisy for a weeks but I don't think the pump is tied into the brakes like on a MH. Maybe it's the Alli is groaning on a braking downshift or it's something else. Any similar experiences?
 

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Discussion Starter #3
Thanks nvplzd. I actually had the Hydro Boost rebuilt last year with new fuid etc. I've put 20k miles on it with no problems until now. I wonder where the noise comes from? I'm thinking I should have tested it by putting the transmission in nuetral before braking hard to rule out the trans making the noise. Any other thoughts?
 
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