1. Connect the SSTs to the brake pipes as shown in the figure.

2. Bleed the air from the brake system.
3. Measure the fluid pressure of the master cylinder and the rear brake.

Fluid pressure

Power brake unit inspection
Dual proportioning valve replacement (without abs)Mazda 6 Service Manual: Brake/Clutch Fluid
Inspecting Brake/Clutch Fluid Level
WARNING
If the brake/clutch fluid level is low, have the brakes inspected:
A low brake/clutch fluid level is dangerous. A low level could indicate brake lining
wear or a brake system leak which could cause the brakes to fail and lead to an
accident.
The b ...
Mazda 6 Service Manual: Dtc c1095, c1096
Caution
When attaching the tester lead to the ABS (ABS/TCS) HU/CM harnesses
connector the SST (49 G066 001) must be used. (See ABS (ABS/TCS) HU/CM
INSPECTION.)
Diagnostic procedure
...