Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20103 L4-2.5LREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLHYDRAULIC SYSTEMBRAKE FLUID PRESSURE SENSOR/SWITCHTESTING AND INSPECTION
2010 Mazda 3 L4-2.5L
Brake Fluid Pressure Sensor/Switch: Testing and Inspection
2010 Mazda 3 L4-2.5LSECTION Testing and Inspection
BRAKE FLUID PRESSURE SENSOR INSPECTION
1. Switch the ignition to off.
2. Install the SSTs to the master cylinder (secondary side) as shown in the figure.
NOTE:
- When installing the SST (49 D043 0A0) to the master cylinder, use a commercially available flare nut wrench (flare nut across flat 12 mm {0.47 in}).
3. Bleed the brake line and the SSTs of air. (Bleed the SSTs of air using air bleed valve A.)
4. Connect the M-MDS to the DLC-2.
5. Select the "MCYLI_P" PID. On-Board Diagnosis - Dynamic Stability Control (DSC)
6. Start the engine.
7. Depress the brake pedal, and verify that the fluid pressure value of the SST (gauge) and the value shown on the M-MDS are equal.
- If the fluid pressure values are different, replace the DSC HU/CM. DSC HU/CM Removal/Installation
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.