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ABS Bosch 8.0
ABS Bosch 8.0
The brake cylinder and the servo brake may be independently replaced.
  WARNING
Always replace self-locking nuts and screws subject to angular torque
   
1 - ABS control unit -J104-
q   remove and install the ABS hydraulic unit -N55- with theABS control unit -J104 - → Chapter.
2 - Hydraulic ABS unit -N55-
q   TheABS reflux pump -V39- and the coupled valves must not be separated.
q   When replacing the hydraulic unit, seal the old part with the plugs from the repair set number ET 1H0 698 311 A
q   remove and install the ABS hydraulic unit -N55- with theABS control unit -J104 - → Chapter.
3 - Brake pipe connection
q   Hydraulic unit for right front brake caliper
q   Identification in the hydraulic unit -VR-
4 - Brake pipe connection
q   for the left rear brake caliper
q   Identification in the hydraulic unit -HL-
5 - Brake pipe connection
q   for the right rear brake caliper
q   Identification in the hydraulic unit -HR-
6 - Brake pipe connection
q   Hydraulic unit for left front brake caliper
q   Identification in the hydraulic unit -VL-
7 - Brake cylinder connection
q   Brake cylinder/floating plunger loop for the hydraulic unit
q   Identification in the hydraulic unit -HZ1-
8 - Brake cylinder connection
q   Brake cylinder/floating plunger loop for the hydraulic unit
q   Identification in the hydraulic unit -HZ2--
9 - Sealing
q   to servo brake
10 - Servo brake
q   On gasoline engines, the vacuum required is removed from the intake manifold.
q   On diesel engines, a vacuum pump is installed to create vacuum
q   Operation checking:
–  Press the brake pedal several times until the end with the engine stopped (This eliminates any remaining vacuum inside the device).
–  Now, keep the brake pedal pressed in the braking position with medium force and start the engine. When the servo brake is working correctly, it can be felt with a foot on the brake pedal (the amplification is active).
q   In case of faults, replace completely
q   Check valve (in the flexible vacuum tube) → Chapter
q   separate from the brake pedal → Chapter.
q   disassemble and assemble → Chapter
11 - Self-locking hex head nut
q   replace
q   28 Nm
12 - Sealing ring
q   replace
13 - Self-locking hex head nut
q   replace
q   20 Nm
14 - Brake cylinder
q   cannot be repaired. Where faults occur, replace completely.
q   remove and install → Chapter
15 - Retaining pin for the brake fluid reservoir
q   insert through the brake cylinder
16 - Sealing plug
q   moisten with brake fluid and press in the brake cylinder
17 - Sealing plug
q   connection to flexible vacuum tube
18 - Brake fluid reservoir
19 - Plug
20 - Screws
q   8 Nm
21 - Self-locking hex head nut
q   replace
q   20 Nm
22 - Support
23 - Stud
q   Stud welded to the body
24 - Self-locking hex head nut
q   replace
q   20 Nm
25 - Stud
q   Stud welded to the body
26 - Support

   

Brake systems > ABS, ADR, TCS, EDL, ESP > Hydraulic unit, servo brake/brake cylinder - assembly overview > ABS Bosch 8.0

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