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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Mercedes-Benz E-Class W123 (from 1976 to 1985, the year of issue)

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Mercedes-Benz W123
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Mercedes-Benz
W123
Introduction
Gasoline engines
Coupling
Manual transmission
Automatic Transmission
Driveline and rear axle
The front suspension
Rear suspension
A steering
Brakes
Design and specifications
Checking and replacing the disc brake pads
Removing, dismantling and installation of the brake caliper
Inspection, removal and installation of a brake disk
The main brake cylinder
Hoses and pipes
Parking brake
Electrical
Body and Equipment
 


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Design and specifications




Design and specifications

The brake system is structured on two separate contour diagram at the front and rear wheels. The brake mechanism of a disk type with hydraulic self-regulation and the wear pads. Each circuit has its own reservoir on the master cylinder. To increase the effectiveness of the braking system is configured with a vacuum booster (gain - three).

On some cars the last few years the issue was placed anti-lock braking system (ABS).
The parking brake with mechanical (rope) operated drum and acts on the rear wheels, and drums are structured on the rear discs. Clearances pad manually adjusted every 48,000 km.

After carrying out any work related to removing the hydraulic brake lines, or the loss of brake fluid, it is necessary to carry out pumping the brake system.

The final stage of work on the brake system is running (check operation). Brakes should be tested on a large and at low speed.

In the braking system affect the tires, the load of the car (its alignment). The frequency of inspection for leaks every 16,000 km. Replacing the brake fluid once a year.

Brakes Wheel

Brake disk

Characteristic

Value

The outer diameter of the disc, mm

  • front

278 0.2

  • Rear

279 0.2

Disc thickness, mm

  • front

12.6

  • Rear

100

The minimum thickness of the disc, mm

  • front

10.6

  • Rear

8.3

The axial run-out of the working surface of the disk, no more, mm

0.12

Calipers

Characteristic

Value

Brand

Teves, Bendix, Girling

Bore mm

54,00

The diameter of the wheel cylinder, mm

54,00-54,05

The thickness of the pads new brake pads, mm

front brakes

  • until 1979

15.0

  • 1979

17.5

rear brakes

  • until 1979

15.0

  • 1979

15.5

The minimum thickness of brake linings, mm

20

The area of the brake pads, cm2

  • front

206 (T269 or T226 type)

  • Rear

100 (type T223)

Servo

Characteristic

Value

Brand

ATE T52 / 225

Bore mm

228.6

Stroke, mm

35

Gain

3.0-4.5

Roundness of the cavity of the main brake cylinder, no more, mm

0.03

The diameter of the drum parking brake, mm

160 0.2

The thickness of the brake lining handbrake mm

new

4.0

minimal

15

The width of the brake shoe, mm

25.0

The total number of teeth on the segment pieces.

12

Average braking power (when moving the drive mechanism 4-6 teeth sector), kgf

30.0

The onset of action of the parking brake clicks

12

Tightening torques of the main threaded connections kgs.m

Connection Type

Value

Attaching the front disc hub

11.5

Mount caliper to the steering knuckle

11.0

Mounting support to a trailing arm

9.0

Fixing the master cylinder to the vacuum amplifier

15

Coupling nut hydraulic hose

15

Coupling the flexible hose

0.9

Servo mounting

thirty

Attaching a vacuum tube amplifier

thirty

Mounting bracket pad handbrake

50

Locking screw of the main cylinder

0.4-0.8

Stopper main cylinder

1.5-3.0

Pressure sensor

1.5-1.9


Anti-lock braking system ABS

1 - speed sensor of the front wheels
2 - rotational speed sensor of the rear wheels
3 - Hydraulic System
4 - the electronic control system
5 - Power Brakes

6 - lock steering
7 - ABS warning light
8 - a safety device
9 - Relay





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Checking and replacing the disc brake pads

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