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How to change the brake pads in a 03 C320?
Car: Mercedes-Benz, C320, 2003 - Back to Fix-It
Q.How to change the brake pads in a 03 C320?
Answer Attached is the procedure from the manual for both the front and rear pads.
Remove/Install
DANGER:
Risk of poisoning from swallowing brake fluid. Risk of injury from brake fluid coming into contact with skin and eyes.
Pour brake fluid only into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.
CAUTION:
See notes on handling brake fluid
See notes on repairs to brake system
DANGER:
Risk of death. Death may result if vehicle slips or topples from the lifting platform.
Align vehicle between the columns of the lifting platform and position the four support plates at the lifting platform support points specified by the vehicle manufacturer.
1 Remove front wheels
2 S10/1 Disconnect connector from front brake pad contact sensor
NOTE: Defective contact sensors must be replaced.
CAUTION: See note on installing contact sensor for brake lining wear indicator
3 Unscrew self-locking bolts (31c), remove floating caliper (31a) upwards take off
NOTE:
Tie floating caliper to body.
Check dust boots of piston at floating caliper for damage.
- Installation: Replace self-locking bolt (31c).
4 Remove brake pads (31g)
NOTE: Brake pads are to be disposed of as special waste. Please ask local authorities if it is permitted to dispose of these parts as household-like industrial refuse.
CAUTION: Installation: Only brake pads approved by Mercedes-Benz may be fitted in sets.
NOTE: Installation: Ensure that the retaining plates (31d) are mounted correctly on the brake carrier.
5 Check lining thickness of brake pads and condition of brake discs
CAUTION: If the brake pads are worn down beyond the permissible wear limit, the web between sealing groove and dust cap may be damaged, for this reason, checking braking system for leaks using pressure gauge
6 Pull the front brake pad contact sensor (S10/1) out of the pad backing plate of the brake pad (31g)
NOTE: Replace faulty contact sensor.
CAUTION: See note on installing contact sensor for brake lining wear indicator
7 Press back piston (47) using resetting device (031)
CAUTION: Possibly suction off some brake fluid beforehand in order to prevent the brake fluid reservoir overflowing when pushing back the piston.
If the piston is difficult to move then remove and install, replace front axle floating caliper.
8 Clean contact surface of brake pad (31g) in brake carrier and floating caliper (31a)
9 Install in the reverse order
DANGER:
Risk of accident when the vehicle is first operated following repair work due to inadequate braking effect the first time the service brake is applied.
Before starting engine, actuate brake pedal several times until the pressure is built up and maintained in the brake system.
10 Operate brake pedal several times until the brake pads make contact with the brake disks (firm resistance can be felt)
11 Check the brake fluid in the brake fluid reservoir and correct if necessary.
NOTE: Fill up or suction off brake fluid to the max. Marking on the brake fluid reservoir
DANGER:
Risk of poisoning from swallowing brake fluid. Risk of injury from brake fluid coming into contact with skin and eyes.
Pour brake fluid only into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.
CAUTION:
See notes on handling brake fluid
See notes on repairs to brake system
DANGER:
Risk of death. Death may result if vehicle slips or topples from the lifting platform.
Align vehicle between the columns of the lifting platform and position the four support plates at the lifting platform support points specified by the vehicle manufacturer.
1 Remove rear wheels
2 Disconnect connector (X62/8) of contact sensor (S10/4)
Model 203 with Engine 112
Model 209 with Engine 112, 113
NOTE: Defective contact sensors must be replaced.
CAUTION: See notes on installing brake wear indicator contact sensors
3 Drive out retaining pin (41) using a drift (035)
NOTE: Drive in retaining pin (41) all the way using a drift.
4 Pull out brake pad (43) using lever (034)
CAUTION: Installation: Only brake pads approved by Mercedes-Benz may be fitted in sets. Brake pads should be disposed of as special wastes. Please ask local authorities if it is permitted to dispose of these parts as household-like industrial refuse.
NOTE: Installation: Smear the side surfaces (arrows) of the brake pads (43) lightly with brake pad paste.
5 Check lining thickness of brake pads (43) and condition of brake discs.
CAUTION: If the brake pads are worn down beyond the permissible wear limit, the web between sealing groove and dust cap may be damaged, for this reason, check braking system for leaks using pressure gauge
6 Pull contact sensor (S10/4) out of pad backing plate or out of brake lining
NOTE: Replace defective contact sensors (S10/4). Observe installation position of contact sensor (S10/4)
CAUTION: See notes on installing brake wear indicator contact sensors
7 Press back piston (47) using resetting device (031)
CAUTION:
Draw off some brake fluid beforehand if necessary, to prevent the brake fluid reservoir overflowing when pressing back the piston.
Use wedge to secure opposed piston to prevent it from slipping out.
NOTE:
Press back the other piston with the resetting device, not bending the heat shield in the process.
If the piston is difficult to move then remove/install/replace brake caliper of rear axle.
8 Clean brake pad guide with brake caliper brush (030)
9 Install in the reverse order
DANGER:
Risk of accident when the vehicle is first operated following repair work due to inadequate braking effect the first time the service brake is applied.
Before starting engine, actuate brake pedal several times until the pressure is built up and maintained in the brake system.
10 Operate brake pedal several times until the brake pads make contact with the brake disks (firm resistance can be felt)
11 Check brake fluid in brake fluid reservoir and correct if necessary.
NOTE: Fill brake fluid to max. Mark on brake fluid reservoir, suction off if necessary.
Addition Replacing the pads was successul however, the pad indicator light still on, how do I reset the indicator?
More Info required If you've replaced the sensors and properly connected them the light should extinguish on it's own.
Addition I did not replace the sensors overall they look good, the wear of the pad was about a 4mm from the sensor. Does the change in the pads requires the change of the sensors? Or do I remove use contact cleaner and connect the same again?
More Info required It's possible that a sensor was damaged during the pad replacement or didn't get plug in properly. You can try refitting them but replacement may be the only solution.
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