Technical characteristics of the brake system (Mercedes-Benz E-Class W124)

Brake disc diameter:
– models 320 and 300 with 24 valves	294 mm
- other models	284 mm
Brake disc thickness:	New	Minimum
– Models 300 with 24 valves	22.0 mm	19.4 mm
– models 320:
• models before October 1992	22.0 mm	19.4 mm
• models from November 1992	25.0 mm	22.4 mm
– other models:
• solid disk	12.0 mm	10.0 mm
• ventilated disc	22.0 mm	19.4 mm
Maximum allowable disc runout	0.12 mm
Minimum permissible thickness of brake shoe linings	2 mm

Brake disc diameter	258 or 278 mm
Brake disc thickness:	New	Minimum
– models 320 and 300 with 24 valves Universal	20.0 mm	17.4 mm
- other models	9.0 mm	7.3 mm
Maximum allowable disc runout	0.15 mm
Minimum permissible thickness of brake shoe linings	2 mm
Parking brake drum diameter	164 mm

Bolts for fastening the ABS sensor installed on the wheel:
- front sensors	22 Nm
- rear sensors	8 Nm
Brake disc mounting screw	10 Nm
Brake pipe connecting nuts:
- to the support	18 Nm
- other connections	15 nm
Caliper bleed nipples	7 Nm
Front caliper:
– guide pin mounting bolts (movable support)	35 Nm
– caliper holder mounting bolts	115 Nm
Brake Master Cylinder Fastening Nuts	20 Nm
Rear Caliper Mounting Bolts:
– 280E models with speed control	70 Nm
- other models	50 Nm
Wheel mounting bolts	110 Nm
Brake booster mounting nuts	20 Nm
Brake booster hose union nut	30 Nm