i bought this suburban acouple of months ago, and the master cylinder when i got home and checked it was very low, i filled the resevoir and now it it almost empty again , i probably have not driven it 500 miles, of course my first impulse is the wheel cylinders, but man it is cold weather and ihate to work on it now, but i thought the brakes would grab or want to hang up when this happens, it is a 3/4 ton 4x4 94 model, i cannot see where any fluid is leaking from under neath, do you still have to pull the axles on the 3/4 tons like we did in the old days to get the drum off or is it easier now?

 

it is a whole 29 degrees , but i crawled under the suburban any how and found the right rear cylinder to be leaking after all, iam glad that i dont have to drive it everyday, this way it will wait until warmer days