# Group 34 Brake Service Bulletins

#### Bulletin number

#### Title

#### Description

#### Date of issue

34 03 83 (742) | Replacing front brake pads. | Dust seal can get caught between piston and pad, causing damage to the seal. | May 1983
34 05 83 (763) | Floating brake caliper guide bolts, 318i. | Do not lubricate slide bolts | September 1983
34 03 85 (1130) | Brake lining wear warning system. | Describes operation of the brake lining light | January 1986
34 02 86 (1204) | ABS sensor wire harness routing prior to 2/86. | Re-route harness in engine bay, install mounting clip P/N 61 13 1 371 074 for connector | June 1986
34 03 86 (1228) | Bleeding brakes on ABS equipped cars. | Reinforcing the need to pump pedal 12 times while bleeder is open on ABS systems | May 1988
34 06 86 (1292) | Brake pads and brake shoes. | Asbestos warning while handling brake pads | November 1986
34 03 87 (1407) | Routing of wires for brake pad wear sensors. | Ensure correct routing when changing pads, cable must go through bleed valve dust cap, P/N 34 11 1 153 198 | June 1987
34 01 88 (1555) | ABS warning light. | False light after tire changes, check all tires are same size and preferably same brand | January 1988
34 02 88 (1585) | Brake disc checking. | New tools for checking rotor condition | February 1988
34 03 88 (1671) | ABS indicator - defective diode, after 9/87 production. | Relocation of diode into valve relay from hydraulic unit to lower repair costs if diode fails | May 1988
34 05 88 (1755) | Brake dust shields. | Lists dangers of using such components, recommends against them | November 1988
34 06 88 (1784) | Troubleshooting ABS system | Check for and replace loose pulse rings on front wheel bearings. | February 1989
34 01 89 (1850) | ABS sensor lead faults / repair procedure | Introduction of repair leads, to remove the need to replace complete harness. P/N 61 13 9 061 687 | May 1989
32 02 89 (1857) | ABS warning light illumination | Adapter harness for installation of DME 1.3 control units into 325iX produced until end of 5/88 production | August 1989
34 04 89 (1902) | ABS control units E30 except 325iX | Elimination of over voltage protection relay as of 1/89 production. ABS control unit now contains protection diode. | July 1989
34 05 89 (1968) | ABS control units 325iX | Elimination of over voltage protection relay as of 4/89 production. ABS control unit now contains protection diode. | January 1990

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson