Hofs01

I have installed both new Hydroboost and New master Cylinder.. What should I bleed first?

jcloving

I did the same in February. I bled the Hydroboost and my Borgeson box at the same time. After that I bled the MC.

Hofs01

Thanks! I assume all went well....

mrvette

The man is correct, the HB will bleed itself soon as you start the engine, but keep track of the fluid level in your system there.....

then do the m/cyl for brakes....

my 76 ray

Did you bench bleed the master cylinder before you installed it?

Hofs01

I have it installed with the thought of bleeding steering and hydroboost first. Then remove and bench bleed

RS69

Can you bleed the master cylinder installed before connecting the lines? My vette has manual brakes.

Hofs01

I think the preferred method is bench bleeding in a vice. get it level

aussiejohn

Well, yes, if it is brand new and has never been in the car, but there is a better way. Once it's in the car, all you need to do is to get two short lengths of brake line (flared on one end) and the two fittings that screw these lines into the MC. Screw the two lines into the MC and then bend them up and into the fluid reservoir and make sure that their ends are near the bottom of the reservoir. Top up with brake fluid.

Then, have a helper gently push the brake pedal in and slowly let it out while you watch the level of fluid in the MC. Bubbles of air will come out but as long as you keep the ends of the lines "under water" you will purge the MC of all its air. Once you are satisfied that there is no air in the system, unscrew the short lines and quickly insert the correct factory brake lines, one at a time.

This will minimise any spillage and should give you a good hard pedal right from the get-go. It has worked many times for me.

Regards from Down Under.

aussiejohn