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), MERCEDES-BENZ B-Class (W245) B 150 (245.231)

The steps may slightly vary depending on the car design.

How to change rear 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 
                      
                        Brake caliper guide pins grease
                      
                        Copper grease 
                      
                        Sealant
                      
                        Torx bit T30
                      
                        Combination spanner #13
                      
                        Combination spanner #15
                      
                        Combination spanner #16
                      
                        Wheel impact socket #17
                      
                        Brake caliper wind back tool
                      
                        Ratchet wrench
                      
                        Torque wrench
                      
                        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)

MERCEDES-BENZ B-Class (W245) B 150 (245.231)

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

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.
Please note: all work on the car – Mercedes W169 – 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 rear of the car and secure on supports.

Step 5

Unscrew the wheel bolts.

AUTODOC recommends:

Warning! To avoid injury, hold the wheel while unscrewing the fastening bolts. Mercedes W169
Step 6

Remove the wheel.
Step 7

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

Step 8

Unscrew the brake caliper fastening.Use a combination spanner #13.Use a combination spanner #15.
Step 9

Spread the brake pads.Use a crowbar.
Step 10

Remove the brake caliper.

Replacement: brake discs – Mercedes W169. AUTODOC recommends:

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 11

Remove the brake pads.
Step 12

Clean the brake caliper bracket fasteners. Use a wire brush.Use WD-40 spray.
Step 13

Unscrew the caliper bracket fastening.Use a combination spanner #16.
Step 14

Remove the caliper bracket.
Step 15

Clean the brake disc fasteners.Use a wire brush.Use WD-40 spray.
Step 16

Unscrew the brake disc fastening.Use Torx T30.Use a ratchet wrench.
Step 17

Remove the brake disc.
Step 18

Clean the hub.Use a wire brush.

Step 19

Treat the contacting surface.Use copper grease.
Step 20

Move the parking brake shoes against the drum.Use a crowbar.
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.

Step 25

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

Step 26

Treat the brake caliper guide pins.Use the brake caliper guide pin grease.Screw in the guide pins.
Step 27

Treat the fastening bolts.Use a sealant.

Step 28

Install the brake caliper bracket.
Step 29

Tighten the brake caliper bracket.Use a combination spanner #16.Use a torque wrench.Tighten it to 70 Nm torque.

Step 30

Install the brake pads.
Step 31

Treat the brake caliper piston.Use a brake cleaner.

Replacement: brake discs – Mercedes W169. Tip:

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 combination spanner #13.Use a combination spanner #15.Use a torque wrench.Tighten it to 35 Nm torque.
Step 34

Treat the surface where the brake disc contacts the wheel rim. Use copper grease.
Step 35

Clean the brake disk surface.Use a brake cleaner.

AUTODOC recommends:

Replacement: brake discs – Mercedes W169. After applying the spray, wait a few minutes.
Step 36

Install the wheel.

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

To avoid injury, hold up the wheel when screwing in the fastening bolts.
Step 37

Screw in the wheel bolts.Use wheel impact socket #17.
Step 38

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 39

Remove the jacks and chocks.

Replacement: brake discs – Mercedes W169. Professionals recommend:

Check the brake fluid level in the expansion tank and refill if necessary.
Step 40

Tighten the brake fluid reservoir cap. Without starting the engine, press the brake pedal several times until you feel significant resistance.
Step 41

Close the hood.

Comment

Was this manual helpful?

Please rate this manual on a scale from 1 to 5. If you have any questions, feel free to ask us.

How to change rear brake pads on Mercedes W245 – replacement guide

Free download PDF

6.38 MB
How to change rear brake discs on Mercedes W245 – replacement guide

Free download PDF

7.91 MB
How to change front brake hose on Mercedes W168 – replacement guide

Free download PDF

7.65 MB
How to change rear brake shoes on Mercedes W168 – replacement guide

Free download PDF

11.45 MB
How to change brake drum on Mercedes W168 – replacement guide

Free download PDF

6 MB
How to change: Mercedes W245 spark plugs – replacement guide

Free download PDF

3.98 MB
How to change serpentine belt on Mercedes W245 – replacement guide

Free download PDF

3.17 MB
How to change: Mercedes W245 engine oil and filter – replacement guide

Free download PDF

8.04 MB
How to change: Mercedes W245 air filter – replacement guide

Free download PDF

4.3 MB

Your profile is your personal assistant.

It can track car expenses, keep a car log and replacement schedule, and save favourite materials, notes and documents

Install the AUTODOC CLUB app!

Your personal car expenses manager, maintenance tips, reminders about upcoming appointments and service intervals, DIY repair instructions – all this on your phone.

Scan

To download the app:

- scan the QR code
- download from App Store
- download from Google Play

Tips & tricks for your MERCEDES-BENZ A-Class (W169)

How to change automatic transmission fluid | AUTODOC tips

3K views

Published on: 16/09/2020
How to find and change a fuse | AUTODOC

1K views

Published on: 15/08/2020
How to check your head gasket | AUTODOC

4K views

Published on: 13/10/2020
What to do if your check engine light is on | AUTODOC tips

5K views

Published on: 19/08/2020