Proportioning Valve Inspection

WARNING: This page is about a different car, the 2007 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the master cylinder brake pipes, and install the SST (49 D043 0A0) to the master cylinder orientated as shown in the figure.
NOTE:
- Use a commercially available flare nut wrench when installing the SST (49 D043 0A0) to the master cylinder.
  - Flare nut across flat: 12 mm {0.47 in}
    
    Fig 1: Installing Master Cylinder SST
    Courtesy of MAZDA MOTORS CORP.
Connect the SSTs as shown in the figure, and bleed the air from the SSTs and the brake line. (Bleed the air from the SSTs using air bleed valve A.)

Inspect the rear brake fluid pressure when the front brake fluid pressure is adjusted to the level indicated in the table.

If not within the specification, replace the master cylinder.

Fig 2: Identifying Brake Line

Courtesy of MAZDA MOTORS CORP.

PROPORTIONING VALVE FLUID PRESSURE

Front brake fluid pressure (kPa {kgf/cm² , psi})	Rear brake fluid pressure (kPa {kgf/cm² , psi})
5,000 {50.99, 725.2}	3,500-3,700 {35.70-37.72, 507.7-536.6}
10,000 {101.97, 1450.4}	4,950-5,250 {50.48-53.53, 718.0-761.4}