Remove/install brake pads on fixed caliper

AR42.10-P-0161GI

Remove/install brake pads on fixed caliper

24.9.08

 

Remove/install

Danger!

Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes.

Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.

AS42.50-Z-0001-01A

Danger!

Risk of injury to skin and eyes caused by handling hot or glowing objects.

Wear safety gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A



Brake fluid notes

AH42.50-P-0001-01A



Notes on repairs to brake system

AH42.00-P-0003-01A

1

Unscrew the cap on the brake fluid expansion reservoir and suction off some brake fluid

 In order to prevent the expansion reservoir overflowing when pressing back the brake pistons.

2

Remove wheels



Remove/install wheels, rotate if necessary

AP40.10-P-4050GH



Checking

3

Check brake pad thickness and brake disks

 Replace brake pads (43) and brake disks in sets if necessary.



Check brake lining thickness

AP42.10-P-4253GH



Inspect condition of brake disks

AP42.10-P-4258GH

 If the brake pads (43) 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.

AR42.10-P-0015GH

4

Check fixed caliper (31a, 31b) for leaks and dust seal for damage

 If the fixed brake caliper (31a, 31b) is leaky or the dust boot is damaged:

Replace fixed caliper on front axle.

AR42.10-P-0070GI

Replace fixed caliper on rear axle.

AR42.10-P-0080GI

5

Remove brake pad contact sensor

 Replace faulty contact sensors.



Notes on installing brake pad wear sensor contact sensors

AH42.10-P-0003-01A

6

Drive out retaining pins (41) using punch (035) and remove retaining spring (41b)

 Installation: Knock retaining pins (41) all the way in. Replace loosely seated retaining pins (41).

7

Pull brake pads (43) out of fixed caliper (31a, 31b)

 Use lever (043) if necessary. Insert suitable wooden or plastic wedge between lever (043) and fixed caliper (31a, 31b) to prevent damage.

 Brake pads (43) are to be disposed of as special waste. The local authorities can provide information regarding whether disposal is also permitted as industrial waste similar to domestic waste.

 Installation: Only sets of brake pads (43) approved by Mercedes-Benz may be installed.

 Installation: Brake pads (43) with panel (43b) must be lubricated before installation.

AR42.10-P-0161-01GH

Molykote Cu-7439 brake pad paste

*BR00.45-Z-1057-06A

Lever

*123589133300

8

Press back piston using pusher tool (031)

On 4-piston fixed calipers, secure one pair of upper and lower pistons with wedges to prevent them from sliding out. Then press back the other pair of pistons using the resetting device (031).

Wedge

*601589076300

Resetting device

*000589524300

If the piston is difficult to move: 

Replace fixed caliper on front axle.

AR42.10-P-0070GI

Replace fixed caliper on rear axle.

AR42.10-P-0080GI



Clean

9

Clean brake pad guides

 Do not use any sharp-edged or pointed tools to prevent damage.

10

Install in the reverse order

 Danger!

Risk of accident when commissioning the vehicle due to a lack of braking effect when the service brake is operated for the first time after repair work

Before starting engine, actuate brake pedal several times until the pressure is built up and maintained in the brake system.

AS42.50-Z-0002-01A

11

Operate the brake pedal several times until the brake pads (43) contact the brake disks

 Firm resistance should be noticeable at the brake pedal.



Checking

12

Check brake fluid level, correct if necessary



Brake system - inspect fluid level

AP42.10-P-4210Z

Number

Designation

Order number

BR00.45-Z-1057-06A

MB brake paste Molykote (copper colored)

A 001 989 87 51