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I am very much an amateur mechanic and did all four corners in under three hours. Cost of all parts, I seem to recall, between £350 and £400 but Bert will confirm.
Points to watch for:
1. I have seen it said that you have to disconnect the hoses from the front calipers or modify the bracket where the hose is clipped to the strut. Tosh. Remove the spring clip from the hose bracket - it pushes off - and you can carefully rotate the caliper clear of the disc after first removing the pads. Either tie it out of the way or get a third hand to help - it only takes three minutes to change each disc once the caliper is clear.
2. Check that the famous stainless steel plates inside the calipers against which the pads bear have not lifted so that they bind on the pads. To do the job properly is quite a major exercise but a reliable Porsche specialist advised me that the plates only lift so far - all they do is grind a bit off the metal backing plates on the pads until they fit. Worked for me. 3. You may or may not need new wear sensors - I played safe and purchased some as I did not want the car laid up while I obtained some if the old ones could not be reclaimed.
4. The anti-squeal shims which stick to the back of the pads need to be separated with a normal domestic paint scraper before you can slide the pads out. Up to you whether you fit new ones - Rennlist seems to favour leaving them out as brake squeal does not seem to be a problem and feel seems to be better without. I compromised and put them on the back, where squeal is more likely, and left them off at the front. Works fine, great feel and no squeals.
5. If you buy Zimmerman discs from Bert, you will find that the hubs develop a fine layer of rust quite quickly. This looks horrible. I retro-painted mine with Hammerite heat resistant matt black paint (800 degrees, should be enough)- looks great. A tip - I cleaned the rust off the first one and found it tricky to get cover with the paint. For the other three, I just painted over the fine rust and it seemed to give a better key. You may wish to paint before fitting, however. Either way, it only took an hour to do all four corners two at a time with 45 minutes to allow the paint to 'touch dry' before refitting the wheels. Probably not a good idea to get paint on the swept part of the disc.
And finally, make sure you torque everything up properly - you don't want your calipers to fall off now, do you?
Geoff Peters e-mail - geoff.peters@tryhomes.co.uk