Clearance at B or no clearance at B or C

WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

Measure and record height D1 of the gauge rod.
Turn the adjusting nut until there is no gap between the SST body and the master cylinder.

Fig 1: Turning Adjusting Nut Until There Is No Gap Between SST Body And Master Cylinder
Courtesy of MAZDA MOTORS CORP.
Measure and record height D2 of the gauge rod.

Fig 2: Measuring Height D2 Of Gauge Rod
Courtesy of MAZDA MOTORS CORP.
Subtract D1 from D2 and add 0.1-0.4 mm {0.004-0.016 in}. Using the SST turn the nut to shorten the power brake unit push rod an amount equal to this sum.

Fig 3: Turning Nut To Shorten Power Brake Unit Push Rod
Courtesy of MAZDA MOTORS CORP.