Recommended replacement interval for the part category Brake Disc : 50000 km

Important!

This replacement procedure can be used for:
MERCEDES-BENZ A-Class (W169) A 150 (169.031, 169.331)

The steps may slightly vary depending on the car design.

How to change front brake discs and brake pads MERCEDES-BENZ A W169 TUTORIAL | AUTODOC

Replacement: brake discs – Mercedes W169. List of the tools you'll need:

                        Wire brush
                      
                        WD-40 spray
                      
                        Brake cleaner 
                      
                        Copper grease 
                      
                        Brake caliper guide pins grease
                      
                        Combination spanner #17
                      
                        Drive socket # 13 
                      
                        Drive socket # 18 
                      
                        Torx bit T30
                      
                        Wheel impact socket #17
                      
                        Ratchet wrench
                      
                        Torque wrench
                      
                        Brake caliper wind back tool
                      
                        Round-nose pliers
                      
                        Crow bar
                      
                        Wheel chock

All the parts you need to replace – Brake Discs for A-Class (W169) and other MERCEDES-BENZ models

MERCEDES-BENZ A-Class (W169) A 150 (169.031, 169.331)

Replacement: brake discs – Mercedes W169. Tip from AUTODOC:

Replace the brake disks on the car Mercedes W169 in complete set for each axis. Regardless of the state of components. This will ensure even braking.
The replacement procedure is identical for both brake disks on the same axle.
When changing the brake discs, always replace the brake pads.
All work should be done with the engine stopped.

Replacement: brake discs – Mercedes W169. Recommended sequence of steps:

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.

Replacement: brake discs – Mercedes W169. AUTODOC recommends:

To avoid injury, hold up the wheel when unscrewing the bolts.
Step 6

Remove the wheel.
Step 7

Disconnect the brake pad wear sensor plug.Use round-nose pliers.

Please note!

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

Step 8

Clean the brake caliper fasteners. Use a wire brush.Use WD-40 spray.
Step 9

Spread the brake pads.Use a crowbar.
Step 10

Unscrew the brake caliper fastening.Use a combination spanner #17.Use a drive socket #13.Use a ratchet wrench.
Step 11

Remove the brake caliper.

Replacement: brake discs – Mercedes W169. Professionals recommend:

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 12

Remove the brake pads.Use a crowbar.
Step 13

Remove the brake pads retaining clips. Use a crowbar.

Step 14

Clean the brake caliper bracket fasteners. Use a wire brush.Use WD-40 spray.
Step 15

Unscrew the caliper bracket fastening.Use a drive socket #18.Use a ratchet wrench.
Step 16

Remove the caliper bracket.

Step 17

Clean the brake disc fasteners.Use a wire brush.Use WD-40 spray.
Step 18

Unscrew the brake disc fastening.Use Torx T30.Use a ratchet wrench.
Step 19

Remove the brake disc.
Step 20

Clean the hub.Use a wire brush.Treat the contacting surface.Use copper grease.

Step 21

Install the brake disc.
Step 22

Tighten the brake disc fastening.Use Torx T30.Use a torque wrench.Tighten it to 9 Nm torque.
Step 23

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

AUTODOC recommends:

Replacement: brake discs – Mercedes W169. After applying the spray, wait a few minutes.
Step 24

Remove the guide pins from the brake caliper.Clean old grease and rust stains, if there are any, from the caliper guide pins and guide pin boots.
Step 25

Treat the brake caliper guide pins.Use the brake caliper guide pin grease.

Step 26

Screw in the guide pins.
Step 27

Install the brake caliper bracket.
Step 28

Tighten the brake caliper bracket.Use a drive socket #18.Use a torque wrench.Tighten it to 70 Nm torque.
Step 29

Install the brake pads retaining clips. Use a crowbar.

Step 30

Install the brake pads.
Step 31

Treat the brake caliper piston.Use a brake cleaner.

Replacement: brake discs – Mercedes W169. Tip from AUTODOC:

After applying the spray, wait a few minutes.

Step 32

Press in the brake caliper piston.Use brake caliper wind back tool.
Step 33

Install the brake caliper and fix it.Use a drive socket #13.Use a combination spanner #17.Use a torque wrench.Tighten it to 35 Nm torque.
Step 34

Connect the brake pad wear sensor plug.Use round-nose pliers.

Step 35

Treat the surface where the brake disc contacts the wheel rim. Use copper grease.
Step 36

Clean the brake disk surface.Use a brake cleaner.

Replacement: brake discs – Mercedes W169. Tip:

After applying the spray, wait a few minutes.
Step 37

Install the wheel.

AUTODOC recommends:

Important! Hold the wheel while screwing in the fastening bolts. Mercedes W169
Step 38

Screw in the wheel bolts.Use wheel impact socket #17.
Step 39

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 40

Remove the jacks and chocks.

AUTODOC recommends:

Important! Replacement: brake discs – Mercedes W169. Check the brake fluid level in the reservoir and top up if necessary.
Step 41

Tighten the brake fluid reservoir cap. Without starting the engine, press the brake pedal several times until you feel significant resistance.

Step 42

Close the hood.

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