On my 89 W250 I have had a lot of trouble with the front brakes causing the front end to shake, badly at times when stopping. Turned the rotors,not much help. New shocks, no improvement. The truck has low miles and the front end is still tight. Are 4 wheel drives prone to this problem? Any ideas to fix? I have put the larger wheel cylinders and 3" shoes on the rear to help stopping as I pull a trailer a lot.

 

if the rear brakes are not kept in adjustment it will cause the problem u descibe.

 

Also if a caliper is sticking it will do this. next time it does check the wheels if one is sticking it will be HOT. So dont just stick your hand on it.

 

tires are also a possibility. if it also does it to a much lesser extent when you get off the throttle, then brakes have nothing to do with it. it's tires or alignment.