Brake system of the car Mercedes S-Class (W126)

General description of the braking system
The hydraulic brake system consists of a master cylinder, a servo cylinder, and disc brakes on both the front and rear wheels. The system has two circuits, one of which...

Replacing rear and front disc brake pads
Note: The models in question may be equipped with BENDIX, GIRLING and TEVES brake calipers. They differ slightly in the brake pad mounting system. Removal Loosen the...

Replacing the front brake disc
Removal Loosen the wheel bolts. Jack up and support the front end. Remove the front wheel. 5. Cover. 16. Brake hose. 20. Self-locking bolts. 23. Steering linkage arm....

Replacing the rear brake disc
Removal Loosen the wheel bolts. Jack up and support the rear. Remove the rear wheel. 16. Retaining spring. 17. Pins. 18. Brake pads. 20. Brake hose. Loosen the fixing...

Brake fluid — general information
When working with brake fluid, remember the following: Brake fluid must be stored in such a way as to prevent accidental access to it. Brake fluid is corrosive to metal,...

Bleeding the brake system
After any work related to the violation of the tightness of the brake system, air gets into it, which must be pumped out. If the brake pedal "falls" when pressed, then...

Brake pipes and hoses — replacement
The master cylinder is connected to the flexible brake hoses on the calipers via steel tubes. The brake pipes are compressed at the front and have a conical part at the...

Handbrake — design description
1. Bracket. 2. Indicator lamp switch. 3. Retractor spring. 4. Brake release lever. 5. Rod with chain. 6. Nut. 7. Decorative bolt. 8. Thrust washer. 9. Parking brake...

Servo cylinder — checking operation
If you have to press the pedal very hard to brake, you should check the operation of the servo cylinder. With the engine off, press the brake pedal all the way down at...

Replacing the front brake cable
Removal Raise and support the car. On models with a heat shield under the intermediate lever (6), support the rear of the exhaust system with a jack, remove the rubber...

Replacing the rear brake cable
Raise and support the car. Remove the handbrake shoes and cams. Remove the screw (25) from the diagonal lever (4) and disconnect the brake cable. 4. Support bracket of...

Handbrake brake pads
Removal Remove the rear brake disc. Turn the rear axle flange (15) so that one of the threaded holes (24) is positioned above the spring. Lightly compress the spring...

Adjusting the handbrake
If the lever needs to be lifted more than 5 clicks to engage the handbrake, the brake needs adjustment. Remove one bolt on each rear wheel. Jack up and support the rear...

Anti-lock braking system (ABS system)
Mercedes cars can be equipped with an anti-lock braking system upon separate request. It is no longer possible to install ABS on a car that is not adapted for this. 1....

Checking the Low Brake Fluid Warning Light
The brake fluid reservoir (2) is located in the engine compartment. Its cover (4) has a ventilation hole, which must not be blocked under any circumstances. The...

Checking the thickness of brake pads
If the brake pads of the front brakes are heavily worn, a warning light on the dashboard lights up. In this case, the pads must be replaced immediately. Loosen the wheel...

Checking the thickness of brake discs
Loosen the wheel bolts. Raise and support the car, remove the wheels. Measure the thickness of the brake discs. In the workshop, a special tool (035) is used for this,...

Visual inspection of brake pipes
Brake pipes should be inspected every 20,000 km. Raise and support the car. Clean the brake lines with a degreaser. Caution: The tubes are coated with a plastic covering...

Replacing brake fluid
Brake fluid absorbs moisture from the air through the pores in the hoses and the vent in the reservoir cap, which gradually lowers its boiling point. If the brakes...

Checking the handbrake
The handbrake acts on the rear wheels via two drum brakes. Jack up and support the rear of the car. Apply the handbrake 2 clicks and turn both wheels by hand. You should...

Diagnostics of brake system faults
Diagnostics of brake system faults

Brake system specifications
Brake system specifications

Tightening torques for threaded connections
Brakes Engine 280S and 280SE 380SE and 500SE 350SE and 450SE Allen bolt for fastening the brake disc to the front wheel hub 115 115 115 Hexagonal mounting bolt for...

Anti-lock braking system — design description
1 - electronic control device; 2 - hydraulic block; 3 - ABC control lamp; 4 - front wheel speed sensor o - rear wheel speed sensor