Brakes

From W220 S-Class Encyclopedia
Revision as of 16:09, 11 September 2021 by Pokseva (talk | contribs) (→‎Brake shoe extension springs: added part numbers)
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Front brakes

Front brake-related parts in EPC

Front disk brake rotor

  • OE A2204210912 (135 EUR)
  • TRW DF4149S (56 EUR)
TRW DF4149S brake disk

Front disk brake pads

Brake pads are sold in pairs (for both sides).

  • OE A0044209020 (112 EUR)
  • TRW GDB1543DTE (50 EUR)
TRW GDB1543DTE brake pads

Accessory kit

In case brake pads are changed after several years, the spring bolts become seized and to remove them they have to be bent and broken out (see photo below). When buying brake accessory kit, make sure to purchase spring that has bolt anchors (e.g., kit by ATE) to prevent spring from slipping off the bolts (see photos below).

Removing seized spring bolts
Brake spring slipped off the bolts
Brake spring with bolt anchors

Part numbers:

  • Spring - A0004217891 (replaced by A0004219791) (14 EUR)
  • Bolts - A0019915160 (12 EUR)
  • Kit - ATE 13.0460-0237.2 (9 EUR)
ATE 13.0460-0237.2 accessory kit
ATE 13.0460-0237.2 accessory kit

Front dust shield

It is common for the dust shield (also known as protective plate) to rust in the bolt holes resulting in the dust shield touching disk rotor. For the front axle aftermarket dust shields are not available in the market.

Rusted bolt holes fixed by installing large washers

Part numbers:

  • OE left: A2204200444 (124 EUR)
  • OE right: A2204200544 (88 EUR)
Dust shield front left (A2204200444)

Remove/install brake disc (front axle)

  • 61 - Brake disk
  • 63 - Security bolt

Remove/install:

  1. Remove wheels
  2. Check brake lining thickness and brake disks (61). Inspect condition of brake disks. Check brake lining thickness. Only replace brake pads and brake disks (61) in complete sets if necessary. If the brake pads have worn down to beyond the wear limit, the bar between the sealing groove and dust cap may be damaged; therefore: Inspect brake system for leaks with pressure tester.
  3. Remove brake disk. Do not detach brake hose, instead attach brake caliper to vehicle so that it is free of tension. Do not kink or tension brake hose, as otherwise it will be damaged.
  4. Remove locking bolt (64) and remove brake disk (61). Installation: Replace securing bolt (64)

Clean:

  1. Clean contact surfaces and seat of brake disk (61) if necessary.
  2. Lightly grease seat of brake disk (61) using Hot lubricating paste.
  3. Install in the reverse order

Checking:

  1. Carry out brake test on the test stand

Torque specifications:

  • Locking bolt of rear/front axle brake disk: Nm 10
Load video
YouTube
W220 Front Brake Rotors Replacement (By Masood)

Rear brakes

Rear brake-related parts in EPC

Rear disk brake rotor

Note that for vehicles with M113 V8 engine (S500/S430) the rear caliper is around 1cm wider than on vehicles with M112 V6 engine (S350), therefore the rear disk rotor for M113 V8 engine is 22mm thick, while for M112 V6 engine only 11m.

S500/S430:

  • OE A2204230212 (120 EUR)
  • TRW DF4437 (42 EUR/piece)
TRW DF4437 brake disk (22mm thick)

S350:

  • OE A2204230112 (114 EUR)
  • TRW DF4436 (36 EUR/piece)
TRW DF4436 brake disk (11mm thick)

Rear disk brake pads

Brake pads are sold in pairs (for both sides).

  • OE A0034205120 (87 EUR)
  • TRW GDB1546DTE (35 EUR)
TRW GDB1546DTE brake pads

Brake shoes

For installation instructions see parking brake page.

Part numbers (set for both sides):

  • OE - A2204200520 (87 EUR)
  • Ate 03.0137-4016.2 (35 EUR) - comes with springs
  • TRW GS8482 (30 EUR)
Brake shoes (Ate 03.0137-4016.2)

Brake shoe extension springs

Part numbers (number of pieces for both sides):

  • Extension spring, brake shoe pull-back (x2) - A2104230092, FEBI BILSTEIN 02105 (0.23 EUR)
  • Extension spring, brake shoe pull-back (x2) - A2014230692 (replaced by A1714230092), FEBI BILSTEIN 02104 (0.71 EUR)
  • Extension spring, brake shoes to cover plates (x4) - A2014230592, FEBI BILSTEIN 02103 (0.24 EUR)
Brake shoe pull-back (A2104230092)
Brake shoe pull-back (A2014230692)
Brake shoes to cover plates (A2014230592)

Brake shoe expansion lock

Part numbers (set for both sides):

  • OE - A2014200589 (13 EUR)
  • ATE 03.0137-9704.2 (6 EUR)
Brake shoe expansion lock (ATE 03.0137-9704.2)
Brake shoe expansion lock (ATE 03.0137-9704.2)

Rear dust shield

Part numbers (left):

  • OE left: A2204230420 (96 EUR)
  • A.b.s. 11320 (30 EUR)
  • METZGER 6115177 (20 EUR)
  • Triscan 812523214 (23 EUR)
  • Nk 233342 (26 EUR)

Part numbers (right):

  • OE right: A2204230520 (125 EUR)
  • A.b.s. 11321 (30 EUR)
  • METZGER 6115178 (20 EUR)
  • Triscan 812523215 (23 EUR)
Dust shield rear left (A2204230420)

The dust shield is attached to the wheel carrier using two E10 (A2204230071) and two 13mm (A2204230371) bots.

Bolt E10 M6x12 (A2204230071)
Bolt 13mm M8x12 (A2204230371)

To the rear right dust shield the wear indicator wiring bracket (A2205460843) is attached.

Rear right wear indicator wiring bracket (A2205460843)

Rear brake pads replacement

This video shows how to replace front and rear brake pads. The video shows part numbers for the Brake Pads (Front and Rear) and Pad Wear Sensor. Torque values are also shown.

Load video
YouTube
W220 Brake Pads Replacement (By Masood)

Rear driver brake caliper replacement

This video shows how to replace the rear driver caliper in a left steered car. The procedure is very similar for the other wheels.

Load video
YouTube
W220 Rear Brake Caliper Replacement (By Masood)

Remove/install brake disc (rear axle)

  • 61 - Brake disk
  • 63 - Security bolt

Remove/install:

  1. Remove wheels
  2. Release parking brake
  3. Check brake lining thickness and brake disks (61). Inspect condition of brake disks. Check brake lining thickness. Only replace brake pads and brake disks (61) in complete sets if necessary. If the brake pads have worn down to beyond the wear limit, the bar between the sealing groove and dust cap may be damaged; therefore: Inspect brake system for leaks with pressure tester.
  4. Remove brake disk. Do not detach brake hose, instead attach brake caliper to vehicle so that it is free of tension. Do not kink or tension brake hose, as otherwise it will be damaged.
  5. Preloading automatic cable slack adjuster
  6. Remove locking bolt (64) and remove brake disk (61). If parking brake drums are run in, turn back the adjusting mechanism of the parking brake beforehand. Otherwise the brake shoes will be damaged. See: Adjusting parking brake. Installation: Replace securing bolt (64)

Clean:

  1. Clean contact surfaces and seat of brake disk (61) if necessary.
  2. Lightly grease seat of brake disk (61) using Hot lubricating paste.
  3. Check condition of brake shoes of parking brake. If necessary: replace parking brake brake shoes:
  4. Install in the reverse order

Checking:

  1. Check version of pedal assembly
  2. Adjust parking brake
  3. Release automatic slack adjuster
  4. Carry out brake test on the test stand

Torque specifications:

  • Locking bolt of rear/front axle brake disk: Nm 10
  • Bolt, brake cable at parking brake cable slack adjuster 12

Brake lines

Part of the original brake line replaced with copper brake line and 4.75mm connectors

Brake fluid replacement

Regular Flush Every Two Years. Brake fluid DOT4 is hydroscopic (absorbs water) and needs to be exchanged every two years under the maintenance schedule. A local dealer quoted $95 for this task. Plan for between 1-1.5 hrs if you DIY.

Warnings

  • It is critically important to use the DOT rating specified in the owner’s manual.
  • Brake fluid is hazardous. Wear latex gloves, safety glasses, and protect the paint of your car.

DIY Brake Fluid Flush

  • Suck out old fluid in reservoir using a miti-vac or a turkey baster.
  • Top off with NEW UNOPENED DOT-4 PLUS fluid ONLY!
  • Connect Power Bleeder which has been filled with NEW UNOPENED DOT-4 PLUS fluid!
  • Pressurize the brake system with the Power Bleeder (138KPa (20 psi) via the integrated pump).
  • Bleed all four callipers, LR, RR, LF and then RF.
  • Inspect for leaks.
  • Depressurize the system, CAUTION: DO NOT SPRAY THE FLUID, otherwise you will be getting a new paint job.
  • Do a manual check of brake pressure
  • Make a final check of the level of fluid in the brake reservoir.
  • Record Brake Flush in Maintenance Records.
  • Dispose of old brake fluid responsibly .

TIP: If possible alternate brake fluid colour from one flush to the next. The difference in colour gives good confidence that everything is flushed out.

Quantity of Brake Fluid Required for a Thorough Flush: It will use about 3L for a full and thorough flush.

The following video shows how to completely flush and replace the Brake Fluid using the Pressure Vacuum method.

Load video
YouTube
W220 Brake Fluid Flush (By Masood)

Parts

DOT 4 brake oils (MB 331.0 spec):

  • FEBI BILSTEIN 26748 (0.25l) - 2.5 EUR
  • FEBI BILSTEIN 23930 (1l) - 7.4 EUR
  • FEBI BILSTEIN 23932 (5l) - 26.4 EUR
FEBI BILSTEIN 26748 (0.25l)
FEBI BILSTEIN 23930 (1l)
FEBI BILSTEIN 23932 (5l)
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