Quote:
Originally Posted by Hydratech
Hi Kevin - bleed the brakes just like you would with any other car - ENGINE OFF. This means that you can bleed the brakes before you even hook up the power steering line set. If you are going to bleed the brakes before hooking up the PS line set, place a towel under the brake unit as it will weep PS fluid out of the ports (as it has been fully dyno tested and is currently full of PS fluid). Note that the one major difference in a hydroboost system is that the brakes will be about a solid inch lower while the system is powered down versus when it is powered up (engine running). I personally prefer to have the PS system lines connected up and the preliminary fill / steer right and left procedure done before brake bleeding - you can even fire the engine up and check for proper power steering operations, but please DO NOT attempt brake bleeding with the system powered up (engine running).
http://hydratechbraking.com/braketech1.html
Here is the statement located in our instructions:
*IMPORTANT! NEVER APPLY THE BRAKES WHILE THE MASTER CYLINDER IS REMOVED, OR YOU MAY DESTROY THE BRAKE ASSIST UNIT BY POSSIBLY OVEREXTENDING THE POWER BRAKE UNIT’S OUTPUT PISTON OUT OF THE PRECISION BORE THAT IT OPERATES IN!
Having the MC installed is the safety stop / travel limiter to prevent this from happening. Imagine a piston popping to far out of its cylinder bore in an engine block (!)
*Perform brake bleeding procedures with the engine off for best results.
You may also dramatically misunderstand what you are feeling with the system bled and the brakes powered up (engine running) at first. I suggest you place the vehicle on a hoist or jack stands, place the vehicle into gear to get the rear tires spinning, then apply the brakes just enough to overcome engine torque of any kind, as this will give you the best idea as to how (little) you actually have to apply the brakes to stop the vehicle. Some people just blaze down on the brake pedal not understanding what they are feeling while the vehicle is sitting still, building 1600 PSI of line pressure thinking that something is weird / wrong (that is until they actually hit the streets!).
Scroll down to the bottom of this old webpage again for reference with the C3 Vette customer's feedback - he completely misunderstood what he was feeling in his brake response at first:
http://hydratechbraking.com/testimonials_old/
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Great I will hook it all up first then bleed. Can not wait!!