Does anyone know how to replace the main (front) parking brake cable

Look here:
Pelican Mercedes-Benz Tech Article - Adjusting Your Mercedes Benz Parking Brake - 190E, W124, W126, W201, W123

The last pciture shows you where the front cable attaches with a bolt on the left side. You will have to create slack in that adjuster using the adjustment bolt.
Removing the pedal end should then not be a problem.
Did yours break?

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Prost!

Yes the cable broke. Looked at the "adjusting brake article"

NO Help.

I can figure out how to connect the ends, but I need help figuring how to run the cable. It runs along the top of the drive shaft and goes into a wall towards the front of the car. It looks like I would have to remove exhaust system / driveshaft / etc. to get to it. Does anyone know a shortcut

Here's how the factory does it:

http://www.w124-zone.com/downloads/MB%20CD/W124/w124CD2/Program/Chassis/42-0520.pdf

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'96 C220 138,000mi, '95 E300D 239,000 mi., '87 300TD 214,000mi '88 6.2 Turbo Diesel Chevy Conversion Van 253,000 mi.

Have a look here =>

http://www.peachparts.com/shopforum/tech-help/341121-achtung-das-schweinhund-baby-benz-thread-21.html

Starts at post # 307

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

There are two bolts on the adjuster, one for attachment of the front cable, and one for slack adjustment. You need to slacken the adjuster, and then remove the attachment bolt. The cable will then be free on the bottom for removal. Of course, you have to undo it at the pedal too.

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Prost!