if the old brushes does not work (there is an activated autostop from inside the brush to protect the armature collectors to get the spring after the brush between it . 1 look at the color of the fieldcoil of the motor and also the commutator (all collectors of the armature)
in 60% of cases with motors between 1200 and 1800 watt in many cases it is not worth the brush exchange. field coil is dark colored then the bearings are dry
Often the engines in a number of operating hours built and only has one collector to stabbing something and within a week you lose your brushes again, have you a motor in a Vacuum below 1000w then is the change to make 1 succesfully change of the brushes much higher . in most cases there are several equivalent motors for vaccuums The brand fixapart is one of the very good motors to use for equivalent . its good in Festool Protool Starmix and many more
Here an example
Fixapart Stofzuiger motor AB86 1000 W Miele
Fixapart Vacuum cleaner motor AB86 1000 Miele W7 18501
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