Rear Wheel Cylinder: Reassembly

Coat all parts with brake cylinder paste. Reassemble wheel cylinder by reversing disassembly procedure.

Fig 1: Exploded View of 320i Rear Wheel Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble piston assemblies using thin coating of ATE brake paste. Install piston assemblies into cylinder bore, using a guide sleeve to prevent damage to seals. Install secondary piston stop screw, making sure piston is pushed fully forward before screw is installed and tightened. Install retaining ring in end of master cylinder bore.

Fig 1: Master Cylinder Secondary (Front) Piston Assy.

Courtesy of BMW OF NORTH AMERICA, INC.

TIGHTENING SPECIFICATIONS

Application		Ft.Lbs. (N.m)
Caliper Mounting Bolts
	Front	58-69 (79-94)
	Rear	43-48 (58-65)
Rotor-to-Wheel Hub
	528e & 633CSi	11-13 (15-18)
	733i	23-24 (30-33)
	320i	36-42 INCH Lbs. (4-5 N.m)

DISC BRAKE ROTOR SPECIFICATIONS

Application

Disc Diameter In. (mm)

Lateral Runout In. (mm)

Parallelism In. (mm)

Original Thickness In. (mm)

Min. Refinish Thickness In. (mm)

Discard Thickness In. (mm)

320i

Front

.....

.008 ⁽¹⁾ (.2)

.0008 (.02)

.500 (12.7)

⁽²⁾

.461 (11.7)

528e

Front

.....

.008 ⁽¹⁾ (.2)

.0008 (.02)

.866 (22)

⁽²⁾

.827 (21)

Rear

.....

.008 ⁽¹⁾(.2)

.0008 (.02)

.374 (9.5)

⁽²⁾

.334 (8.5)

633CSi

Front

.....

.008 ⁽¹⁾ (.2)

.0008 (.02)

.866 (22)

⁽²⁾

.827 (21)

Rear

.....

.008 ⁽¹⁾ (.2)

.0008 (.02)

.748 (19)

⁽²⁾

.709 (18)

733i

Front

.....

.006 ⁽¹⁾ (.15)

.0008 (.02)

.866 (22)

⁽²⁾

.827 (21)

Rear

.....

.006 ⁽¹⁾ (.15)

.0008 (.02)

.394 (10)

⁽²⁾

.354 0)

⁽¹⁾	Installed on vehicle.

⁽²⁾	Matching of each braking surface is.020" (.5 mm). Discard rotor thickness must be observed.

DRUM BRAKE SPECIFICATIONS

Application		Drum Diam. In. (mm)	Drum Width In. (mm)	Max. Drum Refinish Diam. In. (mm)	Brake Cyl. Diam. In. (mm)	Master Cyl. Diam. In. (mm)
320i
	Rear	9.84 (250)	.....	9.88 (251)	3/4 (19.05)	.....