wheel AUDI A4 1998 B5 / 1.G ABS Bosch 5.0 Workshop Manual

45-12


Brake line connections: 15 Nm (11 ft lb)
Note: Fig. 1 Brake line connections at the hydraulic unit for ABS/EDL,
front wheel drive and ABS/EDL/ASR front wheel drive
1 - Hydraulic unit to brake master cylinder (primary piston circuit)
2 - Hydraulic unit to right-rear brake caliper
3 - Hydraulic unit to left-front brake caliper
4 - Hydraulic unit to brake master cylinder (secondary piston circuit)
5 - Hydraulic unit to left-rear brake caliper
6 - Hydraulic unit to right-front brake caliper
Pressure dampers are not installed on models with all wheel drive and
EDL suction control (from 05.95) Fig. 2
.
EDL suction control minimizes control noises.The working range of the pressure limiting valve in the hydraulic unit is
raised from 90 25 bar (1323 368 psi) to 170 25 bar (2499
368 psi).
Pa
ge 7 of 12 Anti-lock Brake S
ystem
(ABS
), Bosch 5.0
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.2

45-13


FIg. 2 Brake line connections at the hydraulic unit, all wheel drive
and ABS/EDL pressure control ( 05.95)
Two pressure dampers are threaded into the hydraulic unit
(arrows) on models with all wheel drive and EDL pressure control
(they smooth out pressure peaks in the brake lines and minimize
control noises).
Counter-hold at the hex on the pressure damper when loosening
the brake line.
1 - Hydraulic unit to brake master cylinder (primary piston circuit)
2 - Hydraulic unit to right-rear brake caliper
3 - Hydraulic unit to left-front brake caliper
4 - Hydraulic unit to brake master cylinder (secondary piston circuit)
5 - Hydraulic unit to left-rear brake caliper
6 - Hydraulic unit to right-front brake caliper
Pa
ge 8 of 12 Anti-lock Brake S
ystem
(ABS
), Bosch 5.0
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.2

45-14


EDL suction control was introduced on models with all wheel drive from
05.95. This system reduces the control noises during an EDL control
cycle.
The pressure dampers threaded into the hydraulic unit ( Fig. 2
arrows)
previously used to reduce working noises have been discontinued. The
working range of the pressure limiting valve in the hydraulic unit is raised
from 90 25 bar (1323 368 psi) to 170 25 bar (2499 368 psi).
Connector coding eliminates the risk of incorrectly connecting the
hydraulic unit. Fig. 3 Brake line connections at the hydraulic unit for ABS/EDL,
all-wheel-drive models, suction control (05.95 )
1 - Brake line tightening torque: 15 Nm (11 ft lb)
Pressure damper discontinued. The brake line is now the same
length as for FWD.
4 - Brake line tightening torque: 15 Nm (11 ft lb)
Pressure damper discontinued. The brake line is now the same
length as for FWD.
Pa
ge 9 of 12 Anti-lock Brake S
ystem
(ABS
), Bosch 5.0
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.2