Remove/check/install front axle brake pads

AR42.10-P-1600PF

Remove/check/install front axle brake pads

4.5.11

17.3.11

Perform brake test on dynamometer, added

Step 11

 

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

Remove front wheel

Remove/install wheels, rotate if necessary

AP40.10-P-4050Z



Checking

2

Check brake pad thickness and brake disks

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

Check brake lining thickness

Model 203

AP42.10-P-4253P

Model 209

AP42.10-P-4253A

Inspect condition of brake disks

Model 203

AP42.10-P-4258BP

Model 209

AP42.10-P-4258BQ

3

Check fixed caliper (31a) for leaks and dust boots for damage

 Replace dust boots or fixed caliper (31a) if necessary.

AR42.10-P-0070PF

4

Remove brake pad contact sensor

 Replace faulty contact sensors.



Notes on installing brake wear indicator contact sensors

AH42.10-P-0003-01A

5

Drive out retaining pins (41) using punch and remove retaining spring (31d)

 Installation: Knock retaining pins (41) all the way in. Ensure that retaining spring (31d) is correctly seated.

6

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

 Installation: Do not use sharp-edged or pointed tools to clean brake pad guides as otherwise the dust boots may be damaged.

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

 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.

7

Press back brake piston using resetting device

 To prevent the brake fluid reservoir overflowing, suction off some brake fluid beforehand.

 On 4-piston fixed calipers on the front axle, secure pairs of opposing pistons with wedges to prevent them from sliding out. Press back remaining pairs using pusher tool.

Resetting device

*000589524300

Wedge

*601589076300

If the brake piston is difficult to move: 

Install new fixed brake caliper (31a).

AR42.10-P-0070PF

8

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

9

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

10

Check brake fluid level, correct if necessary

Brake system - inspect fluid level

AP42.10-P-4210Z

11

Carry out brake test on the test stand

AP42.00-P-4290BA