Shimano BR-RS505 repaint project

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familyguy
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Shimano BR-RS505 repaint project

Postby familyguy » Wed Mar 13, 2024 2:30 pm

I pulled my Cube Attain apart last weekend to start a rebuild process. The condition of the calipers was surprisingly shoddy. The corrosion is evident in the photos. I know the bike wasn't immaculately looked after prior to my ownership, but it was under cover and cleaned off now and then. I've bike-washed it every month or so. So I started debating myself about just ditching the 105/505 setup and sourcing an update for brakes and gears.

Then I thought why not just repaint the calipers, properly channel my inner 19 year old car owner self? Nothing to lose, aside from two calipers, which, being honest, I'm open to admitting I'm a little snobbish about putting back on in this state.

Front:
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Rear:
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I've seen a few Shimano brake calipers around this era looking like this, even some later/higher models like Ultegra. Terrible paint? Poor prep? Bad metal? Poor maintenance? Dunno. It's not salted roads here, that's for sure.

Based on the video below, I know what should be in them once they're apart. There is a window later this month of a weekends access to a sandblast setup with beads or soda to get them cleaned up.


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antigee
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Re: Shimano BR-RS505 repaint project

Postby antigee » Wed Mar 13, 2024 6:08 pm

" It's not salted roads here, that's for sure."

Pom and very happy to have stopped dealing with the (expensive) impact of salted roads....would say that the first rental we lived in here in Melbourne had a pool adjacent to the large open carport...definitely a lot of unexpected corrosion damage to items left out in the car port presumably wind blown corrosive chemical bearing water vapour from the pool

dmwill
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Re: Shimano BR-RS505 repaint project

Postby dmwill » Wed Mar 20, 2024 2:20 pm

Seems to be common on the older non-series Shimano calipers.

I'm guessing it's a combination of:

Galvanic corrosion with different metals (the retaining screw is known to get seized and corrode).
Brake dust from sintered/metallic pads and a lack of care/cleaning.
Maybe a history of being ridden in coastal or wet areas.

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familyguy
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Re: Shimano BR-RS505 repaint project

Postby familyguy » Thu Mar 21, 2024 9:24 am

It's a 2016 bike, so I'm betting this is mostly due to age and lack of a little cleaning now and then. I don't think it lived coastally and had resin pads in it. Looking forward to getting these apart on the weekend, then maybe blasted if I can sort the timing.

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familyguy
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Re: Shimano BR-RS505 repaint project

Postby familyguy » Sat Mar 23, 2024 6:04 pm

Spot the fault.

Image

Pretty sure the piston had a hairline crack in it. Pushed them out with a little air and it blew apart in the caliper. Others fine. Explains a slight sponginess in rear brake, too.

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Cleared off the more corroded and bubbled areas. Sandblasting done (not pictured), paint tomorrow.

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baabaa
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Re: Shimano BR-RS505 repaint project

Postby baabaa » Sun Mar 24, 2024 5:15 pm

familyguy wrote:
Sat Mar 23, 2024 6:04 pm
Spot the fault.
This man is a dentist so we cant show you his face?

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familyguy
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Re: Shimano BR-RS505 repaint project

Postby familyguy » Mon Mar 25, 2024 9:12 am

Never underestimate the usefulness of a dental pick in the workshop!

Image

Primed, awaiting paint yesterday. Did that later but left them in the shed so they can dry. Metalshield gloss enamel takes quite a while to dry to a decent hardness.

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MichaelB
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Re: Shimano BR-RS505 repaint project

Postby MichaelB » Mon Mar 25, 2024 9:16 am

What’s the plan to replace the cracked piston ?

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familyguy
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Re: Shimano BR-RS505 repaint project

Postby familyguy » Mon Mar 25, 2024 9:31 am

Unless I find a dead caliper someplace, aftermarket it will be. Shimano doesn't sell replacement pistons as small parts. There are various ceramic or aluminium body/ceramic insert versions available. Lots of forums saying "just buy a replacement caliper, you get new pads with it and they're pretty cheap". Well, sure, you can downgrade it to Altus level for $55 new, or go up to straight replacement for $90. Yeah, nah.

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familyguy
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Re: Shimano BR-RS505 repaint project

Postby familyguy » Fri Mar 29, 2024 9:50 pm

Got them back from hardening up. Aside from the one I dropped before it dries, looks good.

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Now to await pistons arriving and then reassembly.

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familyguy
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Re: Shimano BR-RS505 repaint project

Postby familyguy » Wed Apr 03, 2024 1:16 pm

So the pistons have been delayed a little. The rebuild will still happen, so will come back to this. In the meantime, a lightly used R7000 groupset is on its way to me which I should hopefully have early next week for fitting :roll: :oops:

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familyguy
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Re: Shimano BR-RS505 repaint project

Postby familyguy » Wed Apr 03, 2024 4:24 pm

I did have an idea though.

I found some other paint that would contrast nicely. I have a vinyl cutter. I have the 1970s Shimano logo as a PNG image.

Image

You can see where this is going.

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