Well set about fitting the st170 setup, was easier than I thought really. I've never replaced rear discs or pads before but I will be from now on, it's easier than the fronts! Simply had to remove the old caliper and carrier, push off the disc and then mount the new disc, carrier, slot the pads into the carrier and then bolt the caliper over the top. Had a small moment where I couldn't get the caliper mounted but discovered it was because the small prong on the pad wasn't lining up with one of the holes in the piston.
Fronts were going to be harder as I had to drill the hub out to 12mm (not sure why really when my 8 pot, 330mm kit used 10mm bolts so surely a 300mm kit can cope with 10mm too?). Jacked the car up and prepared to do one corner at a time until I discovered that my drill was too small for a 12mm drill bit.. doh. Quick call to my dad and persuaded him to drop his drill round I began drilling.
Anyone who has tried to enlarge a hole before knows how difficult it is to get the drill bit spot on centre but some how I managed to drill them out. New disc mounted, carrier on, pads slotted into carrier and then caliper bolted over the top again, job done.
Had some trouble bleeding the brakes (my 10 year old quickly got bored of pushing the brake pedal down) and I couldn't get rid of the spongy feel so popped over to Halfords and bought an Eezibleed, what an amazing bit of kit. Started flushing the old fluid out of the system while it drew the new stuff through, job done
Drove down to Shrewsbury to see the family few hours later and had slight wobble through the steering wheel. Either this is due to the 3mm spacers I've put on the front recently or the fact that my wheels are not balanced right (not taken them on the motorway before) I don't know. I've removed the spacers and will see if it's made a difference later on.
First impressions? Well the setup feels stronger than before as you would expect, how much of that is down to the increase in size I'm not sure. I had a go at bedding the pads in before setting home from Shrewsbury, doing 10-12 near stops from 60 to 15mph as instructed on stop tech, the brakes did feel very good. Think I'm going to do this a few more times as they say the disc is meant to be a blueish colour afterwards?
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