Some cars of recent years were equipped with an anti-lock braking system (ABS).
The parking brake is a mechanical (cable) drum-type drive and acts on the rear wheels, with the drums being structurally mounted on the rear discs. The clearances of the pads are adjusted manually every 48,000 km.
After any work involving disconnecting the brake hydraulic lines or loss of brake fluid, it is necessary to bleed the brake system.
The final stage of work on the brake system is running-in (functional check). Brakes should be checked at both high and low speeds.
Note: The operation of the braking system is affected by the condition of the tires and the vehicle load (its centering). Inspection frequency for leaks every 16,000 km. Replace brake fluid once a year.
Wheel brake mechanisms
Brake disc
Characteristic | Meaning |
Outer disc diameter, mm | |
| 278+0,2 |
| 279+0,2 |
Disc thickness, mm | |
| 12,6 |
| 10,0 |
Minimum disc thickness, mm | |
| 10,6 |
| 8,3 |
| Axial runout of the working surface of the disk, no more than, mm | 0,12 |
Brake caliper
Characteristic | Meaning |
Brand | Teves, Bendix, Girling |
Piston diameter, mm | 54,00 |
Wheel cylinder diameter, mm | 54,00—54,05 |
Thickness of new brake pads, mm | |
front brakes | |
| 15,0 |
| 17,5 |
rear brakes | |
| 15,0 |
| 15,5 |
Minimum thickness of brake shoe linings, mm | 2,0 |
Brake pad area, cm² | |
| 206 (type T269 or T226) |
| 100 (type T223) |
Vacuum booster
Characteristic | Meaning |
Brand | ATE T52/225 |
Piston diameter, mm | 228,6 |
Piston stroke, mm | 35 |
Gain factor | 3,0—4,5 |
Ovality of the main brake cylinder cavity, no more than, mm | 0.03 |
Parking brake drum diameter, mm | 160+0,2 |
Parking brake lining thickness, mm | |
new | 4,0 |
minimal | 1,5 |
Brake shoe width, mm | 25,0 |
Total number of teeth per segment, pcs. | 12 |
Average braking force (when moving the drive mechanism by 4-6 teeth of the sector), kgf | 30,0 |
Parking brake starts to apply, clicks | 1—2 |
Tightening torques of main threaded connections, kgf·m
Connection type | Meaning |
Fastening the disc to the front hub | 11,5 |
Fastening the caliper to the steering knuckle | 11,0 |
Fastening the caliper to the trailing arm of the suspension | 9,0 |
Fastening the master cylinder to the vacuum booster | 1,5 |
Hydraulic hose coupling nut | 1,5 |
Flexible hose connection nipple | 0,9 |
| Vacuum booster mount | 3,0 |
Attaching a vacuum tube to an amplifier | 3,0 |
Parking brake shoe holder mount | 5,0 |
Master cylinder lock screw | 0,4—0,8 |
Master cylinder plug | 1,5—3,0 |
Pressure sensor | 1,5—1,9 |
Anti-lock braking system ABS
1 - front wheel speed sensor; 2 - rear wheel speed sensor; 3 - hydraulic system; 4 - electronic control system; 5 - brake booster; 6 - steering wheel lock; 7 - ABS malfunction indicator lamp; 8 - safety device; 9 - relay
Original can be found on the website (MercedesMAN.ru)