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Author Topic: Bloated rubbers!  (Read 404 times)

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Offline steveindar

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Bloated rubbers!
« on: May 14, 2020, 07:57:54 pm »
So doing a bit of stripping and cleaning on the VFR. Big struggle to remove the brake calipers, both front and back, as pistons had siezed up. Got them out and stripped out the pistons with my jury-rigged master cylinder. Whilst stripping I dump everything in the handy bowl of diesel for cleaning and end up forgetting to remove one set of piston rubbers. These have now swelled up to twice their original size. How do I get them to shrink back to normal for reinstallation? Can't get spares and can't wait till next year.

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Online Dux

Re: Bloated rubbers!
« Reply #1 on: May 14, 2020, 08:01:09 pm »
Replace with new or good used rubbers
« Last Edit: May 14, 2020, 08:33:30 pm by Dux »
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Offline steveindar

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Re: Bloated rubbers!
« Reply #2 on: May 15, 2020, 05:18:43 am »
Yes. Not what I want to hear right now.

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Offline 73 Peanut

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Re: Bloated rubbers!
« Reply #3 on: May 15, 2020, 07:19:17 am »
Did that once before about 30 years ago after my dad warned me not too . Some things you only do once .
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Offline DIRT SKUNK

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Re: Bloated rubbers!
« Reply #4 on: May 15, 2020, 11:49:19 am »
I'm afraid form bitter experience
you'll need new rubber seals
DS
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Offline RobC

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Re: Bloated rubbers!
« Reply #5 on: May 15, 2020, 11:58:40 am »
Unfortunately any rubber designed for brake fluid reacts with petroleum products like a woman on a chocolate binge... they get rounder and fatter... :sip:

Ek slaap vanaand op die bank as MD dit sien... :imaposer:
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Offline steveindar

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Re: Bloated rubbers!
« Reply #6 on: May 15, 2020, 12:30:12 pm »
Quote from: RobC on May 15, 2020, 11:58:40 am
Unfortunately any rubber designed for brake fluid reacts with petroleum products like a woman on a chocolate binge... they get rounder and fatter... :sip:

Ek slaap vanaand op die bank as MD dit sien... :imaposer:
You're a brave man

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Offline katana

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Re: Bloated rubbers!
« Reply #7 on: May 15, 2020, 01:01:12 pm »
You can try a vacuum to leach the unwanted chemicals out.  What will it do to the rubber?  Shrink of course.  How small.......?
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Offline RobC

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Re: Bloated rubbers!
« Reply #8 on: May 15, 2020, 01:35:56 pm »
Quote from: katana on May 15, 2020, 01:01:12 pm
You can try a vacuum to leach the unwanted chemicals out.  What will it do to the rubber?  Shrink of course.  How small.......?
The petrochemicals will not be removed 100% and will continue attacking all the brake components, not worth the risk imho.
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