Actually the disc brake always stop first and then behind by milliseconds if, but usually what happens to crawl will depend on the braking shape The smoke is normal in a sudden braking and depends directly on the ambient temperature, the front brake have the motor load and traction of the vehicle is what its braking is different and it should support more than behind, but I would recommend you to go to one Brake test bank and I do not think you have problems but only the sensation that they do not stop or do it wrong.
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