Acura Coupes and Sedans 1986-1993 Repair Guide

Brake Rotor

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REMOVAL & INSTALLATION



Except Vigor
  1. Remove the caliper and caliper bracket. It is not necessary to disconnect the brake line. Hang the caliper with a piece of wire so no tension is on the brake line.
  2.  
  3. Remove the screws holding the brake rotor on the hub. Sometime a light tap with a punch and hammer will loosen the screws to make removal easier.
  4.  
  5. If the rotor does not pull off, thread 2 bolts into the holes near the studs. Screw the bolts in evenly and the rotor will be pushed off the hub.
  6.  
  7. Clean the hub and install the new rotor.
  8.  

Vigor

See Figures 1 and 2



Click image to see an enlarged view

Fig. Fig. 1: Removing the hub assembly from the steering knuckle-Vigor



Click image to see an enlarged view

Fig. Fig. 2: Remove the bolts holding the rotor to the hub-Vigor

  1. Remove the hub assembly from the steering knuckle.
  2.  
  3. Remove the mounting bolts from the rotor.
  4.  
  5. Separate the hub and rotor.
  6.  
  7. Clean the rotor mounting area on the hub and install the new rotor.
  8.  
  9. Torque the rotor bolts to 40 ft. lbs. (55 Nm).
  10.  
  11. Install the hub on the steering knuckle.
  12.  

INSPECTION



See Figures 3 and 4



Click image to see an enlarged view

Fig. Fig. 3: Measuring disc runout



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Fig. Fig. 4: Measuring disc parallelism

  1. The brake disc develops circular scores after long or even short usage when there is frequent braking. Excessive scoring not only causes a squealing brake, but also shortens the service life of the brake pads. However, light scoring of the disc surface will result from normal use and is not detrimental to brake operation.
  2.  

Differences in the left and right disc surfaces can result in uneven braking.

  1. Disc run-out is the movement of the disc from side-to-side. Install the lug nuts and torque against a washer to hold the rotor in place. Position a dial indicator in the middle of the pad wear area and turn the disc, while checking the indicator. If disc runout exceeds 0.004 in (0.1mm), replace the disc.
  2.  
  3. Disc parallelism is the measurement of variations in disc thickness at several locations on the disc circumference. To measure parallelism, place a mark on the disc and measure the disc thickness with a micrometer. Repeat this measurement at eight (8) equal increments on the circumference of the disc. If the measurements vary more than 0.0006 in. (0.015mm), replace the disc.
  4.  

Only the outer portion of the disc can be checked while installed on the vehicle. If the installed parallelism check is within specifications but you have reason to suspect that parallelism is the problem, remove the disc and repeat the check using the center of pad wear for a checking point.

  1. Measure the thickness of the rotor and replace if the rotor is below the recommended minimum thickness.
  2.  

 
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