Brake system specifications (Audi A4 B6)

Table of contents: General parameters ↓ Front brake mechanisms ↓ Rear brakes ↓ Tightening force of threaded… ↓

Warning: Individual characteristics are also given in the text of the Chapter and, if their implementation is mandatory, are highlighted in bold.

General parameters

Characteristic	Meaning
Design	Hydraulic, dual-circuit with diagonal separation and vacuum booster. Electronic anti-skid system (stability stabilization - ESP), brake Assist (BAS) and Anti-lock Brake System (ABS)
Braking mechanisms	Disk
Front calipers	FN3, C54 or FNR-G60
Rear calipers	C38 or C43

Front brake mechanisms

Characteristic	Meaning
Total thickness of brake pads, mm	14
Wear limit of linings, mm	2 – 3
Brake disc diameter, mm
FN3	288
C54	280
FNR-G60	323
Thickness of ventilated brake disc/Wear limit, mm
FN3	25/23
C54	22/20
FNR-G60	30/28
Thickness of solid brake disc/Wear limit, mm
FN3	15/13
C54	13/11

Rear brakes

Characteristic	Meaning
Total thickness of brake pads, mm
C38	17 (16)
C43	17.5
Brake pad wear limit, mm
C38	7
C43	8
Brake disc diameter, mm
C38	245 (255)
C43	300
Brake disc thickness, mm
C38	10 (12)
C43	20
Parking brake, rear wheel drive
Vacuum booster diameter, mm

Tightening force of threaded connections, N·m

Tightening torques for fasteners are also given in the text of the Chapter and in some illustrations*.

* Tightening moments highlighted in bold in the text must be strictly observed; efforts not in bold are only approximate

Characteristic	Meaning
Front support to bracket
Teves FN3	25
Lucas C54	30
Double piston caliper	25
FNR-G60 Support	30
Rear support to bracket	35
Front wheel hub bracket	190
Rear wheel hub bracket	75
Rear plate to rear wheel hub	10
ABS sensors	10
Wheel bolts	120