Mazda MX-5 Miata / Grand Touring. Manual - part 29

Fig. 16: Brake Fluid Sensor Terminal Continuity Table 
Courtesy of MAZDA MOTORS CORP. 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 BRAKES Conventional Brake System - MX-5 Miata

  

Fig. 17: Identifying Brake Fluid Level Sensor Connector
Courtesy of MAZDA MOTORS CORP. 

POWER BRAKE UNIT INSPECTION 

WITHOUT USING SST 

Operation Inspection 

1. With the engine stopped, depress the pedal several times.  

2. With the pedal depressed, start the engine.  

3. If the pedal moves down slightly immediately after starting the engine, the unit is normal.  

Vacuum Function Inspection 

1. Start the engine.  

2. After driving the vehicle for 1-2 min , stop the engine.  

3. Depress the pedal with normal force.  

4. If the first pedal stroke is long and becomes shorter with subsequent strokes, the unit is normal. 



If a problem is found, inspect for damage to or improper installation of the check valve and vacuum 
hose. After repairing, inspect again.  

Vacuum Loss Function Inspection 

1. Start the engine.  

2. Depress the pedal with normal force.  

3. With the pedal depressed, stop the engine.  

4. Maintain the pedal depressed for approx. 30 s .  

5. If the pedal height does not change during this time, the unit is normal.  

USING SST 

Pre-inspection Preparation 

1. Install the SST (49 N043 001) in the orientation shown in Fig. 18 , (with DSC) 

NOTE:



The following inspection methods are simple inspection methods to judge 
the function of the power brake unit.  



If there is any malfunction in the power brake unit, replace the power brake 
unit as a single unit.  

NOTE:



Install the SST (49 N043 001) to the master cylinder using a 
commercially available flare nut wrench. 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 BRAKES Conventional Brake System - MX-5 Miata

  

2. Connect the SSTs , a vacuum gauge and a pedal force gauge to the master cylinder and bleed the air from 

the SSTs and the brake line. (Bleed the air from the SSTs through air bleeding valve A.) 

Fig. 18: Installing SST (49 N043 001) 
Courtesy of MAZDA MOTORS CORP. 

WITHOUT DSC 



Flare nut across flat: 12 mm {0.47 in}  

 

2008 Mazda MX-5 Miata Grand Touring 

2008 BRAKES Conventional Brake System - MX-5 Miata

  

Fig. 19: Inspecting Vacuum Loss Function - Without DSC 
Courtesy of MAZDA MOTORS CORP. 

WITH DSC 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 BRAKES Conventional Brake System - MX-5 Miata