Recommended replacement interval for the part category Brake Pad Set, disc brake : 30000 km

Important!

This replacement procedure can be used for:
MERCEDES-BENZ A-Class (W168) A 170 CDI (168.009, 168.109) … View more

The steps may slightly vary depending on the car design.

How to change front brake pads on MERCEDES W168 [TUTORIAL AUTODOC]

All the parts you need to replace – Brake Pads for A-Class (W168) and other MERCEDES-BENZ models

Brake Pad Set, disc brake

MERCEDES-BENZ A-Class (W168) A 170 CDI (168.009, 168.109)

Replacement: brake pads – Mercedes W168. Tools you need:

                        Wire brush
                      
                        Nylon cleaning brush
                      
                        WD-40 spray
                      
                        Brake cleaner 
                      
                        Electronic spray
                      
                        Copper grease 
                      
                        Anti-squeal paste
                      
                        Torque wrench
                      
                        Drive socket # 12
                      
                        Wheel impact socket #17
                      
                        Brake caliper wind back tool
                      
                        Ratchet wrench
                      
                        Round-nose pliers
                      
                        Crow bar
                      
                        Wheel chock

Buy tools

Replacement: brake pads – Mercedes W168. AUTODOC experts recommend:

Perform the replacement of brake pads in complete set for each axis. This provides effective braking.
The replacement procedure is identical for all brake pads on the same axle.
Please note: all work on the car – Mercedes W168 – should be done with the engine switched off.

Carry out replacement in the following order:

Step 1

Open the bonnet.Unscrew the brake fluid reservoir cap.
Step 2

Secure the wheels with chocks.

Step 3

Loosen the wheel mounting bolts.Use wheel impact socket #17.
Step 4

Raise the front of the car and secure on supports.
Step 5

Unscrew the wheel bolts.

AUTODOC recommends:

Important! Hold the wheel while unscrewing the fastening bolts. Mercedes W168
Step 6

Remove the wheel.
Step 7

Disconnect the brake pad wear sensor wire.
Step 8

Detach the connector of the brake pad wear sensor.

Please note!

Some cars are not equipped with the brake pad wear sensor.
Step 9

Clean the brake caliper fasteners. Use a wire brush.Use WD-40 spray.
Step 10

Unscrew the brake caliper fastening.Use a drive socket #12.Use a ratchet wrench.
Step 11

Spread the brake pads.Use a crowbar.
Step 12

Remove the brake caliper.

Replacement: brake pads – Mercedes W168. Tip from AUTODOC experts:

Tie the caliper to the suspension or to the body with a wire without disconnecting from the brake hose to prevent depressurization of the brake system.Make sure that the brake caliper is not hanging on the brake hose.Don't press the brake pedal after the brake caliper has been removed. As a result, the piston can fall out from the brake cylinder, and brake fluid leakage and depressurization of the system may occur. Check the brake caliper bracket, brake caliper guide pins and boots. Clean them. Replace, if necessary.
Step 13

Remove the brake pads.

Replacement: brake pads – Mercedes W168. AUTODOC experts recommend:

Measure the brake disc thickness. Upon reaching the wear limit the part must be replaced.
Step 14

Remove the brake pad wear sensor from the brake pad.

Step 15

Clean the brake caliper bracket from dirt and dust.Use a wire brush.Use a brake cleaner.

AUTODOC recommends:

Replacement: brake pads – Mercedes W168. After applying the spray, wait a few minutes.
Step 16

Treat the brake caliper piston.Use a nylon cleaning brush.Use a brake cleaner.

Replacement: brake pads – Mercedes W168. Professionals recommend:

After applying the spray, wait a few minutes.
Step 17

Press in the brake caliper piston.Use brake caliper wind back tool.
Step 18

Treat the brake pads in the area where their surface comes into contact with the brake caliper bracket. Use anti-squeal paste.

Replacement: brake pads – Mercedes W168. Tip from AUTODOC:

Make sure the disc surface is clean before installing the pads.
Step 19

Install new brake pads.

Replacement: brake pads – Mercedes W168. AUTODOC recommends:

Make sure the pads are installed with linings facing the disc.
Step 20

Install the wear sensor on the brake pads.
Step 21

Install the brake caliper and fix it.Use a drive socket #12.Use a torque wrench.Tighten it to 35 Nm torque.
Step 22

Treat the brake pad wear sensor plug.Use dielectric grease.
Step 23

Attach the connector of the brake pad wear sensor.Use round-nose pliers.
Step 24

Connect the brake pad wear sensor wire.
Step 25

Treat the surface where the brake disc contacts the wheel rim. Use copper grease.
Step 26

Clean the brake disk surface.Use a brake cleaner.

AUTODOC recommends:

Replacement: brake pads – Mercedes W168. After applying the spray, wait a few minutes.
Step 27

Install the wheel.

AUTODOC recommends:

Warning! To avoid injury, hold the wheel while screwing in the fastening bolts on the car. Mercedes W168
Step 28

Screw in the wheel bolts.Use wheel impact socket #17.
Step 29

Lower the car and working in a cross order, tighten the wheel bolts.Use wheel impact socket #17.Use a torque wrench.Tighten it to 120 Nm torque.
Step 30

Remove the jacks and chocks.

Replacement: brake pads – Mercedes W168. Tip from AUTODOC:

Check the brake fluid level in the expansion tank and refill if necessary.
Step 31

Tighten the brake fluid reservoir cap. Close the hood.

Replacement: brake pads – Mercedes W168. Professionals recommend:

Without starting the engine, press the brake pedal several times until you feel significant resistance.Slow down smoothly for first 150-200 km after the brake pads replacement. Avoid unneccessary and sharp braking to a stop.

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