Mercedes W123 Brake Peddle Repair

With the introduction of automotive plastics in the 1970's, time is now and will continue to take its toll on these parts. 

A part that will more than likely fail if you own a W123, will be the plastic brake peddle bushing/retainer. Thankfully, Mercedes still has the parts to get the job done.

If you notice side-to-side movement in our brake peddle, it's time make the repair. By leaving this part unattended to can cause brake booster failure.

STEP 1
Remove lower dash covers

STEP 2
Unplug wiring as needed and lower cruise control module. You can let the cruise control unit hang to the side

STEP 3
Remove brake master cylinder and booster

STEP 4
Unplug brake light switch. This is a two part plug, but can be unplugged as one.

STEP 5
Remove brake peddle holder assembly. To do this, wiggle assembly back and forth while pulling toward back of car. It will take a bit of work to release the assembly from the dash brace and rubber buffer. Don't lose the rubber buffer, and check to make sure it is in good shape. You will want to make sure you have this rubber part as it will cause vibration and other noises if you do not.

STEP 6
Remove return spring from peddle and remove brake peddle from assembly.

STEP 7
Gently tap bushing into brake peddle with rubber or plastic mallet until fully seated.

STEP 8
Reinstall brake peddle to assembly.

STEP 9
Do not order the bushing until you remove the entire unit first. It appears some of the cars needed shims. If all is not very tight it will cause excess movement in the peddle and cause the new bushing to fail. 

STEP 10
Return assembly as it was removed.

STEP 11
Return booster, master cylinder and fluid reservoir

STEP 12
Refill system with approved brake fluid and bleed braking system. Make sure there is no air in the lines. You can make this process much easier and a one man operation if you purchase Speed Bleeder brake bleeders. Excellent product and excellent customer service.