Mintex are bad for squealing, try doing a super heavy braking test on them, get on an open road with no one about stop from 60-70mph down to 10mph a few times that should help clear anything out
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Red Escort 1.6LX
Then - Red Escort 1.4
Then - Silver Fiesta ST 170BHP
Then - White Fiesta ST MR200+
Now - Mitsubishi Evo IV Forged 2.3 500BHP
and Mondeo Mk3 2.0TDCI