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George

Brake Piston Condition + Bonus Bikini Clad Girl

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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

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

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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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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.

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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

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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

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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

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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.

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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.

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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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That link is busted :(

 

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

 

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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

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