Bleeding LS4 wheel brake hydraulic system

Does anyone have any experience of bleeding the hydraulic system that
activates the LS4's wheel brake? I have heard a suggestion that it is
necessary to unbolt the master cylinder and hold it in a vertical position
in order to expel all the air from the system. Is this really true?

Also, does anyone know whether any particular type of brake fluid is
recommended or would something off the shelf be OK?

Any hints or tips would be really helpful.

Many thanks.

David Starer

On Apr 3, 12:27*am, "David Starer" wrote:
Does anyone have any experience of bleeding the hydraulic system that
activates the LS4's wheel brake? I have heard a suggestion that it is
necessary to unbolt the master cylinder and hold it in a vertical position
in order to expel all the air from the system. Is this really true?

Also, does anyone know whether any particular type of brake fluid is
recommended or would something off the shelf be OK?

Any hints or tips would be really helpful.

Many thanks.

David Starer

LS4 Hydraulic? Just cables on ours. If it's a modification - all bets
are off. Caution he if it's made to use Aircraft brake fluid (Mil
5606), putting automotive Dot 3 or Dot 4 in it will turn the seals to
goop. If it's made to use automotive Dot 3 or Dot 4, putting 5606 in
it will ruin it quickly. Easy to tell them apart. 5606 is very red
and has a strong odor which is nothing like automotive.
The other option is to competely purge and clean the brake hydraulic
system and run DOT 5 silicone based automotive brake fluid.