Mazda MX-5 Miata / Grand Touring. Manual - part 33

Fig. 30: Front Brake Inspection & Repair Flow Procedure 
Courtesy of MAZDA MOTORS CORP. 

Lateral Runout Inspection 

1. To secure the disc plate and the hub, insert the washer (thickness 10 mm {0.39 in} , inner diameter more 

than 12 mm {0.47 in} ) between each hub bolt and the hub nut, then tighten all the hub nuts. 

2. After tightening all the hub nuts to the same torque, put the dial gauge on the friction surface of disc plate 

10 mm {0.12-0.28 in} from the disc plate edge.  

3. Rotate the disc plate one time and measure the runout. 

Front disc plate runout limit  

0.05 mm {0.002 in}  

NOTE:



The component parts of the SST (49 B017 001 or 49 G019 003) can be 
used as a suitable washer.  

 

2008 Mazda MX-5 Miata Grand Touring 

2008 BRAKES Conventional Brake System - MX-5 Miata

  

Fig. 31: Measuring Front Disc Plate Runout 
Courtesy of MAZDA MOTORS CORP. 

Thickness Variation Inspection 

1. Clean the disc plate-to-pad friction surface using a brake cleaner.  

2. Measure the points indicated in Fig. 32 using a caliper (micrometer).  

3. Subtract the minimum value from the maximum, and if the result is not within specification, machine the 

disc plate using a lathe. 

Thickness variation limit  

0.015 mm {0.00059 in}  

WARNING:



Do not exceed minimum disc plate thickness. 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 BRAKES Conventional Brake System - MX-5 Miata

  

Fig. 32: Inspecting Disc Plate-To-Pad Friction Surface 
Courtesy of MAZDA MOTORS CORP. 

Disc Plate Thickness Inspection 

1. Measure the thickness of the disc plate. 



If the thickness is not within the specification, replace the disc plate.  

Minimum front disc plate thickness  

20 mm {0.79 in}  

Minimum front disc plate thickness after machining using a brake lathe on-vehicle  

20.8 mm {0.82 in}  

Disc Pad Thickness Inspection 

CAUTION:



Excessive runout may result if the disc plate is removed from the 
vehicle then machined. Machine the disc plate while installed on the 
vehicle.  

 

2008 Mazda MX-5 Miata Grand Touring 

2008 BRAKES Conventional Brake System - MX-5 Miata

  

1. Jack up the front of the vehicle and support it with safety stands.  

2. Remove the wheel and tires.  

3. Verify the remaining thickness of the pads. 

Minimum front disc pad thickness  

2.0 mm {0.079 in} min.  

4. Replace the pads as a set (right and left wheels) if either one is at or less than the minimum thickness. 

Fig. 33: Inspecting Disc Pad Thickness 
Courtesy of MAZDA MOTORS CORP. 

FRONT BRAKE (DISC) REMOVAL/INSTALLATION 

1. Remove in the order indicated in Fig. 34 .  

2. Install in the reverse order of removal.  

3. After installation, depress the brake pedal a few times, then verify that the brakes do not drag. 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 BRAKES Conventional Brake System - MX-5 Miata