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Car Forum / MINI / February 2004drum brake warping
I posted a question a while ago on a problem involving the steering wheel shuddering on braking after leaving the car unused for a long time with the handbrake on. I eventually took the rear brakes apart and realized they were both warped, the left one just slightly, the right one visibly... I am now sure that leaving the handbrake on for a long time through weather changes warps the drums. I changed the drums and everything went back to normal. Funny thing is when someone on this NG suggested that the drums could be warped because the handbrake had been left on for a long time, other people answered with something that sounded very much like "please! don't talk rubbish!...". Well, he was right and I'm glad I followed his advice! Cheers to all Dantiri hiya Dantiri I would hazzard a guess that the weather changes had a lot to do with it , as well as the shoes being badly setup or worn in the first place fragged > I posted a question a while ago on a problem involving the steering wheel > shuddering on braking after leaving the car unused for a long time with the [quoted text clipped - 9 lines] > > Dantiri > I eventually took the rear brakes apart and realized they were > both warped, the left one just slightly, the right one visibly... Visibly in what sense do you mean - measurement or by sight? What were the indicators? I am now sure that leaving the handbrake on for a long time through weather changes > warps the drums. I changed the drums and everything went back to normal. > Funny thing is when someone on this NG suggested that the drums could be > warped because the handbrake had been left on for a long time, other people > answered with something that sounded very much like "please! don't talk > rubbish!...". Does cast iron creep causing distortion of the drums? With the colloidal structure of cast iron it may well do. Well, he was right and I'm glad I followed his advice! > Cheers to all > > Dantiri > > I eventually took the rear brakes apart and realized they were > > both warped, the left one just slightly, the right one visibly... > > Visibly in what sense do you mean - measurement or by sight? What were > the indicators? Meaning by sight. also I put the drum on a flat marble surface and the drum would rock side to side. After noticing that I didn't think I needed measurement. > I am now sure that leaving the handbrake on for a long time through > weather changes [quoted text clipped - 11 lines] > > > > Dantiri >>>I eventually took the rear brakes apart and realized they were >>>both warped, the left one just slightly, the right one visibly... [quoted text clipped - 5 lines] > drum would rock side to side. After noticing that I didn't think I > needed measurement. All I was after was a simple procedural check/test to determine if there were problems before fitting/refitting the drums. > I posted a question a while ago on a problem involving the steering wheel > shuddering on braking after leaving the car unused for a long time with the [quoted text clipped - 9 lines] > > Dantiri That would be me then (that made the warped drums suggestion in the first place!) http://makeashorterlink.com/?Y28B31757 Glad to hear that it all worked out OK in the end though, and you've solved the problem. Ben. Heck, Ben, you were the first one to mention that the handbrake had been left on. Even the original poster didn't mention it until his repost. A badly cast drum can warp on it's own over time. Extreme heat can cause a poorly cast drum to warp by allowing internal stresses to be relieved. I have heard that applying the handbrake to hot drums can cause them to warp. This is the kind of thing that was common in the 1930's through the 1950s even in factory drums but it's uncommon today except as a manufacturing defect. It boils down to the fact that a well made drum shouldn't have any warping problem under almost any circumstance. A poorly made drum can do all sorts of strange things. I have a badly warped drum that a friend gave me. It's brand new and he didn't feel like shipping it back to the U.K. for replacement. The other of the pair is perfect but is from another manufacturer. They shipped him a mis-matched pair. I turned the bad one and it's straight now but I'll keep an eye on it if I ever use it. Cheers, Kelley >> I posted a question a while ago on a problem involving the steering wheel >> shuddering on braking after leaving the car unused for a long time with [quoted text clipped - 22 lines] > >Ben. I don't leave any of my cars in storage with the handbrake engaged. I always put chocks under the wheels to stop them rolling or if its to be any lenght of time I put the cars on axcel stands. I also dont leave them in gear. Not because of drum brakes warpng, though thanks for that bi tof info, but because the cables can stretch and / or lock on in place. > I posted a question a while ago on a problem involving the steering wheel > shuddering on braking after leaving the car unused for a long time with the [quoted text clipped - 9 lines] > > Dantiri |
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