I feel the pedal effort for both the throttle and brakes are heavier than I like. Is this normal? I already greased the ball and sockets on the throttle linkages in the engine compartment and it didn't do much. Any other ideas?

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

I dont know what there called, but there are two nylon linkage bushings on top of the valve cover that can cause the accelerator pedal to be heavy if they get dirt in them. As for the brakes, check to see if you have enough vaccum and if so it could be the booster.

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a few mb diesels

My '85 pedal is also stiff. I think there is a bushing in the foot well to grease too. Haven't got around to crawling in there and looking yet.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

My "gas" pedal seems to get stiff after the car has been running for a while...I originally thought maybe bushings, but now I amleaning towards vacuum.....any ideas?

The "gas" pedal shouldn't have anything to do with vacuum on a diesel. It's purely a mechanical linkage.

Mine was having the opposite problem in the winter two years ago. After the car had sit overnight in 35-40 degree temps the linkage to the IP was very stiff and would take a second to come back to idle after I let off. After the engine warmed up the heat from the engine got into the linkage and thinned the old dirty grease a little. Taking the linkage apart, cleaning, and applying a little bit of new grease fixed the problem.

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Dale

http://i52.photobucket.com/albums/g1...MG_2277sig.jpg

1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel

All five MB's I've owned have had "stiff" pedals....ladies?

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83 SD

84 CD

Yep. I forgot to add that the pedals in my 300D are considerably stiffer than my dad's Volvo S70.

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Dale

http://i52.photobucket.com/albums/g1...MG_2277sig.jpg

1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel

IMHE, they're all relatively stiff.

Unless you are in a Benz with "throttle-by-wire" such as in the 210. Can be a bit mushy.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

I advise you clean out the grease in all of the sockets and use ATf as is recommended. Try also lubricating the slide on the back of the pedal.

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DDC/MTU....Setting the pace
1985 300cd
1983 300d...aka "The Yummymummymobile"....Wifes ride
2006 Wesmac 38' Sportfisherman, Single DDC/MTU 12V-2000 1500 hp

Stiff gas pedal not normal, mine is smooth as silk after lubing it. I'd say use grease rather than ATF. The ATF does not last long at all, just runs every where.

The brakes are firm in these cars. Not touchy or overboosted at all, and the brake pedal does not travel very far. I love the W123 brakes!

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1985 CA 300D Turbo , 213K mi

Actually the "stiffness" that I am referring to only happens after the car has been running for a while; the pedal becomes all or nothing....it's like the car does not want me to give it fuel....then I have to punch it to get it to move???? I can't be the only one with this problem.