MST-6163 Pressure Tester

Fig. 1 - Pressure Gauge and Adapter Installed on Hydraulic Assembly:

Some diagnostic procedures in this manual require the use of the MST-6163 pressure gauge and adaptor to measure accumulator pressure during certain phases of operation. The pressure gauge and adaptor should be installed as follows:
(1) De-pressurize the accumulator by pumping the brake pedal a minimum of 40 times with the ignition off, as described in this section.

WARNING: FAILURE TO DE-PRESSURIZE THE ACCUMULATOR PRIOR TO PERFORMING THIS OPERATION MAY RESULT IN PERSONAL INJURY AND/OR DAMAGE TO PAINTED SURFACES.
(2) Remove hydraulic assembly accumulator port plug, which is a hex head plug located on right hand side of hydraulic assembly. (See Fig. 1)

(3) Install adaptor in accumulator port and tighten to 10 N-m (7.5 ft.lbs.) torque.

(4) Install adaptor onto the pressure gauge hose and tighten the fitting to 15 N-M (11 ft.lbs.) torque.

(5) Install pressure gauge and adaptor assembly onto the adaptor installed in the hydraulic assembly accumulator port. Then install the retaining clip into the groove on the accumulator port adaptor. MAKE SURE THAT THE RETAINING CLIP IS INSTALLED ONTO THE ACCUMULATOR PORT ADAPTOR BEFORE REPRESSURIZING THE HYDRAULIC SYSTEM.

WARNING: WHEN REMOVING PRESSURE GAUGE AND ADAPTOR, BE SURE TO DEPRESSURIZE THE HYDRAULIC ACCUMULATOR. TIGHTEN ACCUMULATOR PORT PLUG TO 12 N-m (9 FT.LBS.).

It is not necessary to bleed the hydraulic assembly after installation and removal of the pressure gauge unless additional tubes, hoses, or fittings were removed or loosened.