Beast lost his hydrobooster while my wife and I were down in Boise. While I was down in Boise, I made the call and got a hydrobooster ordered, thinking just direct replacement. Nope!

Be aware...

• The documents in the box from NAPA are very clear; you need to swap parts from your old unit to make the new unit work.

• The shaft that pushes the master cylinder, you might have to swap as I did. The new shaft was 10mm too long, which is the brake dragging issue.

• Then the rubber boot on the input shaft has be pryed off the input shaft collar. Yea! I got that.

• Then, the adapter plate that mounts the brake reservoir / master cylinder.

The removal was fairly straightforward.

15mm socket for most of it, and remove the 2 nuts holding the master cylinder and reservoir. Carefully pull the whole unit forward with the lines attached.

Then 18mm open-end wrench to remove the hydraulic pressure lines from the hydrobooster.

Then, pa air of channel locks to grab the hose clamp for the return line. Pull the retun off.

Under the dash, pop the brake pedal clip off and release the input rod from the pedal. IMPORTANT! Disconnect the battery so the brake lights don't drain the batteries!

Four 15mm nuts are holding the hydrobooster to the firewall. The right top nut has to come from the hole in the top to get the socket in there.

I got it removed and ran to NAPA for the new unit ordered... Yeah, there were multiple hangups in comparing the units and swapping parts back and forth on the two units.

We ended up being there a little bit while the guys were helping out and getting all the bits and pieces pulled off my OEM unit. I'm going to continue the install tomorrow.

Great write up thanks. Ok, help me with this please . Where does it get the power assist from? Years ago I had to change out a vacuum booster on a gas pickup I had, but this being a hydro booster I’m assuming from the PS pump?

2 hours ago, kbf98520 said:

Great write up thanks. Ok, help me with this please . Where does it get the power assist from? Years ago I had to change out a vacuum booster on a gas pickup I had, but this being a hydro booster I’m assuming from the PS pump?

Correct. It's a Cascade system so yes the power steering pump to the hydrobooster. Then it leaves with a second line down to the steering box. There is two low pressure return lines back to the pump which you will see just spring clamps for return lines.