How to change MC on Hydroboost?

2badgn

Member
Joined
Feb 5, 2003
I have an 84 GMC pickup and i need to change the MC. Should i drain the fluid first?

How difficult is this to change?
How do i disconnect the brake lines?

thanks
 
should be the same as any other master cylinder- to remove, just unhook everything and get it out of there before too much brake fluid gets all over everything.
installation is the reverse of removal, only make sure to bench bleed the master before putting it back on- i generally bolt the new master to the booster with the bench bleeding tubes still installed, then remove the bench bleed fittings one at a time and quickly hook the lines back up. usually, you don't even need to actually bleed the brakes- you unhooked the lines at their highest point, and when you hook them back up the little bit of air is displaced by the brake fluid running out of the master cylinder before you get the line hooked up and tightened- but it can't hurt to do it.
 
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