For the brakes squealing usually indicates low brake pad material, I'd be checking that first. Also remove the pads, clean the dust and rust off the inside of the caliper with a wire brush and the carrier where the brake pads sit in it. Then put copper grease or ceramic brake paste on the pads where it touches the caliper and carrier. While you have it apart you should check the piston pushes back okay.
For the low mpg, seeing as it doesn't do many miles give it a good thrashing to clear out the cobwebs and see how it goes after that.
Last edited by 360beast; Sep 30th, 2020 at 08:10.
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