Power Booster; Removal & Installation - Ford Ranger Maintaince And Repair Manual

... then pull the master cylinder off of the mounting studs and remove it from the vehicle.
To install:
5. Before installing the master cylinder, check the distance from the outer end of the booster assembly
push rod to the front face of the brake booster assembly. Turn the push rod adjusting screw in or out
as required to obtain the length shown. Refer to illustration in this Section.
6. Position the master cylinder assembly over the booster push rod and onto the 1 studs on the booster
assembly. Install the attaching nuts and lockwashers and tighten to 13−15 ft. lbs.
7. Connect the hydraulic brake system lines to the master cylinder.
8. Bleed the hydraulic brake system (refer to procedure in this Section). Centralize the differential valve.
Then, fill the dual master cylinder reservoirs with DOT 3 brake fluid to within
top. Install the gasket and reservoir cover. Roadtest the vehicle for proper operation.
When replacing the master cylinder it is best to BENCH BLEED the master cylinder before installing it to the
vehicle. Mount the master cylinder into a vise or suitable equivalent (do not damage the cylinder). Fill the
cylinder to the correct level with the specified fluid. Block off all the outer brake line holes but one, then,
using a long tool such as rod position it in the cylinder to actuate the brake master cylinder. Pump (push tool
in and out) the brake master cylinder 3 or 4 times till brake fluid is release out and no air is in the brake fluid.
Repeat this procedure until all brake fluid is released out of every hole and no air is expelled.

Power Booster

REMOVAL & INSTALLATION
Make sure that the booster rubber reaction disc is properly installed if the master cylinder push rod is
removed or accidentally pulled out. A dislodged disc may cause excessive pedal travel and extreme
operation sensitivity. The disc is black compared to the silver colored valve plunger that will be exposed
after the push rod and front seal is removed. The booster unit is serviced as an assembly and must be
replaced if the reaction disc cannot be properly installed and aligned, or if it cannot be located within
the unit itself.
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HOW TO USE THIS BOOK
1
/ in. (6mm) of the
4
Power Booster