Brake Rotors/Front Hub - Production Change/Installation
REF. NO. 42/124ADATE: March 1997
(supersedes S.I. 42/124, November 1994)
TO: ALL MERCEDES-BENZ PASSENGER CAR DEALERS
Revision: Update to include models with two piston brake calipers
SUBJECT:
MODEL 140 FRONT BRAKE ROTORS
A. ELIMINATION OF ROLL PINS FROM FRONT HUB - PHASE-IN OF NEW BRAKE ROTOR
B. INSTALLATION OF NEW BRAKE ROTOR ON MODELS WITH ROLL PINS ON THE FRONT HUB
A. ELIMINATION OF ROLL PINS FROM FRONT HUB - PHASE-IN OF NEW BRAKE ROTOR
As of October 1993, the roll pins on the front hub and the centering holes on the rotor have been eliminated.
Effective Serial Number
Model As of Chassis End Number
140 A 167 054
Parts Information
Part Name Part Number
Brake rotor for four piston caliper 140 421 10 12
Brake rotor for two piston caliper 140 421 03 12
B. INSTALLATION OF NEW BRAKE ROTOR ON MODELS WITH ROLL PINS ON THE FRONT HUB
CAUTION!
Remove roll pins from front hub before installing the new version rotor (if equipped with roll pins).
Effective Serial Number Range
Model From Chassis End Number Up to Chassis End Number
140 A 000 001 A 167 053
Procedure
Pull roll pins from hub using special tool (Figure 1).
Note
In the event that roll pins are seized and cannot be removed using the special tool, remove hub (see SMS, Job no. 33-0310). Once hub is removed, drive roll pins out from the rear using an 8 mm drift. Reinstall hub, then adjust wheel bearing play to .01 mm (see SMS, Job no. 33-0300).
In Case of Warranty
Operation: Removal of roll pins from both front wheel hubs (with rotor removed).
Does not include:
Additional time for removing seized roll pins. Any additional time needed for removing seized roll pins should be submitted as actual (NON) time, operation number 33000001, with appropriate text in claim text field.
Parts Information
Part Name Part Number
Brake rotor for four piston caliper 140 421 10 12
Brake rotor for two piston caliper 140 421 03 12
Bolt 201 421 01 71
This tool was shipped automatically to all authorized Mercedes-Benz dealerships as part of the Model Year 1995 "A/B" package and should, therefore, already be a part of your tool inventory.
Special Tools