Subject: | Service Information on Coated Brake Rotors |
Models: | 1995 Saturns built after and including SZ297173 with base brakes, SZ301465 ABS
brakes (only front rotors coated), and SZ302457 with ABS brakes (front and rear rotors
coated). |
Purpose
This bulletin provides technicians with brake repair information on brake rotors
with a new rust preventive coating.
A rust preventative coating will be applied to both front brake rotors on all
Saturns and rear brake rotors on Saturns with rear disc brakes built after the above
mentioned VIN ranges. This rust preventative coating will help prevent rust and/or
corrosion of new brake rotors on Saturns during shipment and while they are awaiting
delivery to customers. The rust preventive coating will wear off of the braking surfaces
of the brake rotor during the first 805 to 1287 km (500 to 800 miles). However, the
rust preventative coating will continue to provide corrosion protection on the non-braking
surfaces of the brake rotor.
Service will release brake rotors with the rust preventative coating. The estimated
release date is April, 1995. When servicing brake rotors coated with rust preventative,
these repair procedures must be followed:
| Important: When installing new brake rotors, do not refinish the surface as these parts
are at the correct level of surface finish.
|
• | Never machine a new coated or non-coated service replacement brake rotor. |
• | Never clean a new coated service replacement brake rotor with solvent. |
• | A new coated service replacement brake rotor can be used in any combination
with non-coated brake rotors without affecting braking performance. |
• | When installing new coated brake rotors, make sure to complete the following
break-in procedure: |
- | From 48-64 km/h (30-40 mph), apply brakes gently until vehicle
slows nearly to a stop. Accelerate vehicle back to 48-64 km/h (30-40 mph)
and drive long enough for brakes to cool (about 30-40 seconds). Repeat this
procedure five times. Each time allowing sufficient time between stops for the brakes
to cool. |
- | Complete the break-in procedure by accelerating to 88 km/h (55 mph), then
gently slowing the vehicle from 88-32 km/h (55-20 mph) four times. Allow
30-40 seconds between intervals for brakes to cool. This break-in procedure
will help reduce brake noise and increase brake life and performance. |
Important: When performing routine brake maintenance, rotors should not be refinished,
unless there is a brake pulsation caused by the rotors or the rotors are excessively
scored. Scoring of the rotor surfaces not exceeding 1.5 mm (0.0060 in.) in depth,
which may result from normal use, is not detrimental to brake operation.