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Brake Piston Condition + Bonus Bikini Clad Girl


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#1 George

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Posted 25 August 2015 - 09:58 AM

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. :)

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Edited by George, 25 August 2015 - 10:00 AM.


#2 gav240z

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Posted 25 August 2015 - 11:32 AM

From what I understand any damage/pitting to the piston surface means you should replace it. But happy to be corrected on this.



#3 KatoKid

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Posted 25 August 2015 - 12:58 PM

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. 


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#4 George

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Posted 25 August 2015 - 09:04 PM

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.



#5 aircobra

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Posted 25 August 2015 - 09:07 PM

advanced auto parts better brakes just sold me a full reco set, piston, seals, clips, etc


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#6 George

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Posted 25 August 2015 - 09:13 PM

Great, I'll give them a call tomorrow. Thanks :)



#7 aircobra

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Posted 25 August 2015 - 09:48 PM

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



#8 George

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Posted 26 August 2015 - 09:25 PM

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. 

 

ijuwqpl.jpg



#9 PB260Z

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Posted 26 August 2015 - 09:35 PM

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

#10 gav240z

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Posted 26 August 2015 - 09:58 PM

And the rear slave cylinders are mega expensive  :



#11 PB260Z

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Posted 26 August 2015 - 10:02 PM

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.

#12 gav240z

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Posted 26 August 2015 - 10:16 PM

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.



#13 PB260Z

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Posted 26 August 2015 - 10:28 PM

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.

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#14 GongZ

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Posted 26 August 2015 - 11:27 PM

Stainless sleeving also has the advantage of a life expectancy beyond that of most owners.



#15 aircobra

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Posted 27 August 2015 - 06:57 AM

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.zcardepo...&product_id=128



#16 George

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Posted 27 August 2015 - 09:19 AM

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.zcardepo...&product_id=128

 

That link is busted :(



#17 gav240z

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Posted 27 August 2015 - 09:29 AM

That link is busted :(

 

I suspect you need more practice working your Internet machine. It works for me.

 



#18 George

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Posted 27 August 2015 - 09:33 AM

Hmm, works in Chrome but not Firefox.



#19 PB260Z

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Posted 27 August 2015 - 07:34 PM

Stainless sleeving also has the advantage of a life expectancy beyond that of most owners.


Indeed, ticks all the boxes in my book.

Edited by PB260Z, 27 August 2015 - 07:35 PM.





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