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TRP Hy/Rd brakes - turning upside down harmful?

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TRP Hy/Rd brakes - turning upside down harmful?

Old 06-14-19, 12:33 PM
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tyrion
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TRP Hy/Rd brakes - turning upside down harmful?

Might turning a bike with TRP Hy/Rd brakes upside down introduce air in the hydro system? I sometimes turn my bike upside down to pull a wheel off. Internet search reveals nothing about this.

TRP Hy/Rd is a cable actuated hydraulic brake:

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Old 06-14-19, 12:45 PM
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Ask @ the TRP brakes website? https://trpcycling.com/contact/

generally the expansion tank has a sealing bladder .. unlike the one on the car firewall ...
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Old 06-14-19, 01:22 PM
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Originally Posted by fietsbob View Post
Ask @ the TRP brakes website? https://trpcycling.com/contact/

generally the expansion tank has a sealing bladder .. unlike the one on the car firewall ...
Alright I emailed TRP. I didn't know about the sealing blader.

Thanks.
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Old 06-14-19, 03:24 PM
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That question always puzzles me. This is a closed system. How could air be introduced in there (or any other hydraulic brake system)?
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Old 06-15-19, 10:19 AM
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Merry Sales, Yokozuna brand Motoko disc brakes ; Yokozuna Premium Cables, Housing and Brake Pads are a closed system ..

But you are the pad adjuster, it is not auto compensated..

one thing the HyRd does is eliminate any hose fitting coupling leaks, a common source of air bubbles ..





Magura HS33 Rim brakes are a closed hydraulic system ,, with hoses..
no place for friction heated oil to expand into is needed , because the pads are thick rubber..






,,..

Last edited by fietsbob; 06-15-19 at 10:26 AM.
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Old 06-19-19, 06:03 PM
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FWIW emailed June 14 to Info@trpbrakes.com

Hi,

I have some TRP Hy/Rd brakes and wondered if turning the bike upside down (for wheel removal, etc.) might introduce air into the hydro system. Does it?

(BTW I did a fair amount of internet searching on this question and found nothing.)

Thanks,
Mike
no response yet (June 19)
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Old 06-19-19, 06:08 PM
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Originally Posted by ChinookTx View Post
That question always puzzles me. This is a closed system. How could air be introduced in there (or any other hydraulic brake system)?
I don't really understand this stuff, but even if it's a closed system, does that mean there's no air in the system that needs to be worried about?
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Old 06-19-19, 06:24 PM
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No, there shouldn't be any air in there. Even if there is, putting the brakes upside down or right side up will not change anything, especially with the HyRds, since there's no hose and nowhere the air can "travel" to.

Think of the different ways they can be mounted. On the fork they are vertical, in the back, they can lay flat, or be at an angle depending where the frame mounts are.

I wouldn't worry about it. Else there'd be a big warning on the box they come in with an arrow "This side up" ;-)
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Old 06-19-19, 07:12 PM
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You should call TRP. They are in Ogden Utah and usually answer there phone.
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Old 06-19-19, 10:44 PM
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The HY/RD calipers have a rubber bladder under the cap, and work horribly if there's any air in them, so you should be able to turn them upside down without issue. I would actually say that the angle my HY/RD sits on my fork, it's upside down already.

A typical hydraulic braking system is "sealed" as far as something that presses metal pistons through rubber seals can be sealed. If it were perfectly sealed, the fluid would never get fouled, but the pistons also wouldn't be able to move.

Sealed comes in varying degrees.
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