hydro boost?

[flyinlow]

What do hydo boost brakes do for you?  I have four wheel power disc brakes on my 3rd gen. They work well. I can skid the tires now, so clamping the discs harder  would not appear to make the car stop any shorter.

[Rolling_Thunder]

well...    the hydroboost works great for boosted engines that don't produce vacuum - also it provides a great linear feeling - usually makes higher psi at the calipers...   which is important when you go to larger disc brakes with multi-piston calipers...             

[flyinlow]

I have driven Ryder trucks that had it and the Boeings and Airbus' at work have it. While those vehicals have powerfull brakes, none has a responce I would feel comfortable with  in rush hour traffic with.

Do you just tap into the powersteering system? what happens if the engine stalls?

[Fred]

I have driven Ryder trucks that had it and the Boeings and Airbus' at work have it. While those vehicals have powerfull brakes, none has a responce I would feel comfortable with  in rush hour traffic with.

Do you just tap into the powersteering system? what happens if the engine stalls?

The bottle on the side of most hydraulic brake assist units is referred to as an accumulator or nitrogen reserve. This stores up hydraulic power steering pressure in the event of an engine stall condition, to provide reserve brake assist power for up to 3 applications of the brake, similar to how a vacuum booster would function in an engine stall condition. Upon the first application of the brakes after an engine stall, you would find approximately 60 - 75% of the normal assist available, then if you were to release and apply the brakes again, you would find approximately 30 - 40% assist, then again approximately 10 - 20%, until you have depleted all stored reserve assist. Once you have depleted all of the stored pressure, the brakes will no longer have power assist and will be manual in their operations. The minute you start the vehicle back up again, the accumulator gets filled back up with pressurized ps fluid again and is ready to go!

[Fred]

I have driven Ryder trucks that had it and the Boeings and Airbus' at work have it. While those vehicals have powerfull brakes, none has a responce I would feel comfortable with  in rush hour traffic with.

Do you just tap into the powersteering system? what happens if the engine stalls?

The bottle on the side of most hydraulic brake assist units is referred to as an accumulator or nitrogen reserve. This stores up hydraulic power steering pressure in the event of an engine stall condition, to provide reserve brake assist power for up to 3 applications of the brake, similar to how a vacuum booster would function in an engine stall condition. Upon the first application of the brakes after an engine stall, you would find approximately 60 - 75% of the normal assist available, then if you were to release and apply the brakes again, you would find approximately 30 - 40% assist, then again approximately 10 - 20%, until you have depleted all stored reserve assist. Once you have depleted all of the stored pressure, the brakes will no longer have power assist and will be manual in their operations. The minute you start the vehicle back up again, the accumulator gets filled back up with pressurized ps fluid again and is ready to go!


In regards to power steering connection................

During installation you would remove your existing high pressure ps line, from the ps pump to the steering box or ps control valve. You would then install a replacement ps line from the pump to the assist unit, then another line from the assist unit to the original steering connection. This system, as installed, "piggybacks" the ps system, using the ps pressures, on demand only, to provide brake assist, without a disruption of normal ps operations. When not providing brake assist, it is just part of the flow circuit between the ps pump and the steering box / ps control valve assembly.
Fred

[flyinlow]

Thanks for the information.