Hydroboost Power brake/PS System - Fluid change?

[Jim 5]

My truck has a hydroboost power brake system. Since not only my power steering, but also my power brakes rely on this system, I want to change out the fluid more than recommended.

Is there anything special about changing fluid on hydroboost systems? Can I just disconnect the return line from the saginaw pump reservoir, pump out a quart and put a fresh quart in the reservoir?

Is there anything special I need to know about a hyroboost system? This truck is not new, but it's new to me. It takes the special GM power steering fluid. Interstingly, the saginaw pumps installed in fords and early GM's just use Dex III...but I guess that's another question.

 

[Jim 5]

Can anybody advise?

 

[alreadygone]

Somewhere in that hydro brake boost system is a spirng with enough tension to literally take your head off. As long as you simply change fluid,,safe enough. remove return hose,place end in catch jug, disconnest and ground coil wire and crank engine till fluid quits coming out. Re-attach line and coil wire, fill with reccomended fluid and crank 'er up. Turn wheels from lock to lock and top off with fluid.

Bob

 

[Jim 5]

Thanks,

I intended to use the return line as well.

Only problem is, this truck has 8 coils (one for each spark plug). Any thoughts on how to disable the ignition system on this baby?