Master Cylinder Installation Note

1. Loosen the adjusting nut of the SST.
2. Place the SST on the power brake unit and tighten the nut and washer.

   Tightening Torque 

   9.9-15.6 N.m {100-160 kgf.cm, 87-138 in.lbf} 

3. Apply 66.7 kPa {500 mmHg, 19.7 inHg}  vacuum to the power brake unit by using a vacuum pump.
   Fig 1: Applying Vacuum To Power Break Unit

   Courtesy of MAZDA MOTORS CORP.
4. Turn the adjusting nut of the SST counterclockwise until the gauge rod just contacts the push rod end of the power brake unit. Push lightly on the end of the gauge rod to be sure it is seated. Verify that there is no gap between the adjusting nut and SST body.
   Fig 2: Adjusting Power Break Unit

   Courtesy of MAZDA MOTORS CORP.
5. Remove the SST from the power brake unit without disturbing the adjusting nut. Set the SST onto the master cylinder as shown in the figure.
6. Push lightly on the end of the SST gauge rod to be sure that it is contacting the bottom of the master cylinder piston, but do not push so hard that the piston moves. Note any clearance between the SST body and the adjusting nut: clearance B, or between the body and the master cylinder: clearance C. Adjust the push rod as necessary as outlined in "Adjustment" below.
   Fig 3: Determining Push Rod Adjustment

   Courtesy of MAZDA MOTORS CORP.

Fig 4: Identifying Clearances B & C

Courtesy of MAZDA MOTORS CORP.

Adjustment Clearance at B 

1. Measure and record the height D1 of the gauge rod.
   Fig 5: Measuring Height At D1

   Courtesy of MAZDA MOTORS CORP.
2. Turn the adjusting nut until the SST body sets closely on the master cylinder. Turn only enough for the body to touch.
3. Measure and record height D2 of the gauge rod.
   Fig 6: Measuring Height At D2

   Courtesy of MAZDA MOTORS CORP.
4. Subtract D1 from D2. By using the SST, turn the nut to shorten the power brake unit push rod an amount equal to the difference.
   Fig 7: Shortening Power Brake Unit Push Rod

   Courtesy of MAZDA MOTORS CORP.

1. Push lightly on the end of the SST gauge rod, and measure the clearance between the adjusting nut and the SST body.
   Fig 8: Measuring Clearance At C

   Courtesy of MAZDA MOTORS CORP.
2. Using the SSTs, turn the nut to lengthen the power brake unit push rod an amount equal to the clearance measured at B.

Fig 9: Lengthening Power Brake Unit Push Rod

Courtesy of MAZDA MOTORS CORP.