Started the rebuild and painting of my spare TT brake calipers tonight. Stripped them, started degreasing them and sanded back a couple of bits to reveal these suckers > having no idea if this is regular (many others may not know also?), would it be safe to continue with this rebuild? Just in case these are actually very severe stress fractures or just something on the surface, i don't know. Anyone come across anything similar? cheers
please keep this a technical thread, only want serious answers. Thanks for the that heavytreavy, i thought they probably were casting marks but wanted a few opinions first. Can't be too careful
THAT IS NOT AN ANSWER. Please keep it technical, i'm starting a project zed thread soon and i'd like it to remain technical also
do you meen appose to being on the top rear or bottom of the rotor? *Edit ooops sorry zedex didnt seee your post
your double post on the same subject don't seem to be helping.. I cant win with you mate, If i made another thread about that question, youd be in there having a cry about how i am spamming the forum. Your question was answered in the first post. Why not ask another.
How about taking them to a pro? Sure beats a failure leading to a crash. Any brake shop should have a look at them if they are indeed cracks, and not raised castings (NOTE difference between two markedly different!) Place that does crack testing on engine blocks would be more than capable of dealing with a few calipers methinks.
trying to get different opinions mate. And i have no bloody idea what the hell you said in your first response so yes i would have a go at you in another thread if i couldn't understand.
probably for the best yes. They look a big irregular to be casting marks but they may well be. I don't think they're raised marks at least as i sanded back and the 'crack' marks are still dirty. Might try that tomorrow actually before i start rebuilding them, cheers
bit irregular? no looks pretty normal for cast alloy. Most of the lines are raised , its easy to tell , uve sanded the the alloy and the lines are shiney I spotted 1 that was sunken but thats it . Casting marks that is all ..............:zlove: Trev
yes actually you're right. haha i was a bit transfixed by that one on the right that's bigger and deeper looking. By any means i'll get them checked out just in case and get some more sand paper to see if they extend elsewhere
casting mark casting marks should only occur on the cast joint, ie where the two halves of the mould join, to me those marks look irregular and probably should not be there. If I was you I would get them checked professionally, they look like stress fractures. Cant hurt to check
I had the same marks on mine when i painted them. I bead blasted the caliper and crack tested it and it was fine. You couldnt even see the marks anymore after it was bead blasted. Just rough casting i believe.
ah that's good to know, thanks mate was after a personal experience. Good stuff. May still get them crack tested nonetheless but yeah. Probably won't get them bead blasted cos i'm a cheap arse (just going to diligently sand and prep them, i'm in no rush, then paint them up all bling and such, redo the seals and it'll all be sweet. Shall post pictures when done
Sorry for the non-technical noobie post, but just to clarify, a caliper "rebuild" is basically pulling them apart, getting rid of any crap and replacing the seals, right? Curious to try this at some stage also. Post some progress pics if you can! -Kirill
kbro3 -Pretty much all a caliper is made up of is pistons and seals. Hydraulic pressure and oil galleries do the rest. So if your pistons are in good order your just up for a seal kit. zedex - yeah too easy i had alot of dramas painting mine but the end result was worth it. (They look really nice with the chromies and slotted rotors ) good luck
yeah i'll take a few pictures as i go. There are a few rubber seals around the pistons and that's about it. Just need to get myself a compressor to get the pistons out, forgot about that one. Will let you all know of progress, hopefully have the first lick of paint on today. cheers
An old trick that works well for getting the pistons out: Use a grease gun and scew the hose into the brake pipe fitting in the caliper, then pump the grease gun & the pistons will come out. This works really well but you do have to clean all the grease out afterwards LOL!
compressed air works well and is cleaner if you've got enough pressure up its ass but grease pressure will move just about anything thats going to budge. Getting off topic now. Will shutup
