There are a number of things that you can have done wrong. Get a manual on your car from the parts store and it will tell you how it is supposed to work.
Rebuild the rear drums. Or maybe yank on the cable under the body.
i was wondering how to change rear brake drums for 1999 Chevy venture
How do you change rear brake drum on a 2004 Chevy Venture?
Yes, there is a cable that runs to the rear wheel brake drums.
remove rear brake drums
The brake pads are actually shoes. The emergency brake relies on the rear brake shoes being applied by tension on the emergency brake cable against the rear drums to hold the car stationary. In other words, the rear brakes double as the emergency (parking) brakes.
Pads on front. Drums on the rear.
No, the drums can be cleaned with brake cleaner.No, the drums can be cleaned with brake cleaner.
remove wheels, release emergency brake and drums will come off.
Remove the wheel and tap the drums at back with a 'deadblow' hammer, rotating the drum as you do this. The brake shoes tend to hold drums on.
Get the tyre/wheel balance checked I had theis problem and it drove me nuts for a year trying to figure it out. replacing the rear brake drums solved it immediately.
Brake drums should not be turned beyond a maximum diameter, usually stamped on the drum face. Machining them above the maximum tolerance would subject them to overheating and possible brake failure. Better to replace them with new drums & shoes.