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reading floats from pixel buffer objects

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Hello, I want to read out float values from a pixel buffer object, but unfortunately it doesn't work. First i initialize the pbo like this:
glGenBuffers(1, &pixelBuffer_);
glBindBuffer(GL_PIXEL_PACK_BUFFER_EXT, pixelBuffer_);
glBufferData(GL_PIXEL_PACK_BUFFER_EXT, number*4*sizeof(float), NULL, GL_DYNAMIC_COPY_ARB);

And after rendering i want to read it out:
glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, pixelBuffer_);
glReadPixels(0,0,res,res,GL_RGBA,GL_FLOAT, NULL);
void* pboMemory = glMapBuffer(GL_PIXEL_PACK_BUFFER_ARB, GL_READ_ONLY_ARB);

When i watch the pboMemory, it only contains zero values. But if I change GL_FLOAT to GL_UNSIGNED_BYTE in the ReadPixels call, it works. But I need floats. Am I doing something wrong, or doesn't pbo work with floats? thanks for answers!

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