George Posted August 24, 2015 Posted August 24, 2015 (edited) Stripped the front right claiper over the weekend and all looks servicable but I just wanted to check the piston with you guys. There is some pitting on one of them and I was wondering if I should reuse or replace. The pitting is on the outer edge which looks to be past the rubber seal within the caliper so I suspect it will create a sufficient seal. Thoughts? Also, does anyone have spare shims laying around? I think I need the right shim but haven't looked too closely. Most rebuild kits I've seen do not include them. The other caliper looks to have both shims. Bikini girl was a happy coincidence. Edited August 25, 2015 by George Quote
Administrators gav240z Posted August 25, 2015 Administrators Posted August 25, 2015 From what I understand any damage/pitting to the piston surface means you should replace it. But happy to be corrected on this. Quote
KatoKid Posted August 25, 2015 Posted August 25, 2015 Hi George. The piston may be useable if the pitted area is outside of where the seal works. Measure where the groove for the seal is in the cylinder bore and then push the piston all the way in and confirm that the pitting doesn't go past the seal location when fully depressed. George 1 Quote
George Posted August 25, 2015 Author Posted August 25, 2015 Dave, I measured as suggested and I'm not confident it will create an ideal seal. It overlaps ever so slightly but enough to potentially leak so new piston it is! The pitting really isn't all that bad but not it's not worth the risk imo. Still looking for shims if anyone has any spare ones. Alternately, if you know where I can purchase them that'll do as well. Cheers. Quote
aircobra Posted August 25, 2015 Posted August 25, 2015 advanced auto parts better brakes just sold me a full reco set, piston, seals, clips, etc George 1 Quote
George Posted August 25, 2015 Author Posted August 25, 2015 Great, I'll give them a call tomorrow. Thanks Quote
aircobra Posted August 25, 2015 Posted August 25, 2015 forgot to mention they're in melb suburb mordialloc and you want the set that comes with the squarecut clips, not the round ones which just roll off and are creap Quote
George Posted August 26, 2015 Author Posted August 26, 2015 Stripped the other side and the pistons are shot. I can only save 1 which means they're all getting replaced. Also stripped the proportioning valve and despite it looking rough with fungus-like silver deposits it looks serviceable. Quote
Moderators PB260Z Posted August 26, 2015 Moderators Posted August 26, 2015 Hi George Not surprised the other side is also shot. I would also be checking the rear cylinders good chance they are in a similar condition. Cheers PB Quote
Administrators gav240z Posted August 26, 2015 Administrators Posted August 26, 2015 And the rear slave cylinders are mega expensive Quote
Moderators PB260Z Posted August 26, 2015 Moderators Posted August 26, 2015 And the rear slave cylinders are mega expensive Just get them re-sleeved, that is what I did with the Chev ones.Heaps cheaper than getting new ones. Quote
Administrators gav240z Posted August 26, 2015 Administrators Posted August 26, 2015 What's involved in doing that? I was looking at rebuild kids for them. Not sure if anyone offers them? I found a single rebuild kit on eBay for 1 side only, was tempted to grab it but wasn't sure where I was going to find the other side from. Quote
Moderators PB260Z Posted August 26, 2015 Moderators Posted August 26, 2015 A rebuild kit won't give an ideal result if the bore is pitted. Re-Sleeving is a specialist job, you actually bore out the cylinder housing and press a stainless sleeve in. If you also bead blast the outers and replate the end caps it will look like NOS. I took the lazy way out and just handed the complete units to a brake specialist and picked them up done a week or two later. I didn't worry about getting the look right so just had them painted silver. Quote
GongZ Posted August 26, 2015 Posted August 26, 2015 Stainless sleeving also has the advantage of a life expectancy beyond that of most owners. Quote
aircobra Posted August 26, 2015 Posted August 26, 2015 zcardepot has replicas at good price, but the angle of the input is a bit different so will need to make up a new pipe cheap price but https://www.zcardepot.com/index.php?route=product/product&path=1_15&product_id=128 Quote
George Posted August 26, 2015 Author Posted August 26, 2015 zcardepot has replicas at good price, but the angle of the input is a bit different so will need to make up a new pipe cheap price but https://www.zcardepot.com/index.php?route=product/product&path=1_15&product_id=128 That link is busted Quote
Administrators gav240z Posted August 26, 2015 Administrators Posted August 26, 2015 That link is busted I suspect you need more practice working your Internet machine. It works for me. Quote
George Posted August 26, 2015 Author Posted August 26, 2015 Hmm, works in Chrome but not Firefox. Quote
Moderators PB260Z Posted August 27, 2015 Moderators Posted August 27, 2015 (edited) Stainless sleeving also has the advantage of a life expectancy beyond that of most owners. Indeed, ticks all the boxes in my book. Edited August 27, 2015 by PB260Z Quote
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