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I have this type of recumbent. I want to upgrade to hydraulic brakes, but every bike shop warns me about the issues that will come from attaching the brake levers in a vertical position. They say that it will catch air very quickly. Do I have any options? Maybe there is special brakes for this type of situation?

Recumbent

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    Hydraulic brake levers, in general, "expect" a certain orientation, since they usually contain a reservoir of hydraulic fluid that needs to remain more or less upright to avoid sucking in air. I have read of some levers that have an external reservoir, permitting any orientation, but I know nothing about them. – Daniel R Hicks Jun 5 '16 at 19:47
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    What about mechanical disk brakes? Do you absolutely need an hydraulic system? – Boris Jun 6 '16 at 7:58
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I can't speak for every hydraulic brake ever, but when I've done this I didn't worry about it, I just bought sealed brakes and put them on. I'm currently running cheap Shimano ones on my touring bike and have not had any issues, and in the past I used Hayes with similar lack of problems.

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This bike I switched from cable to hydraulic after cooking the brakes on a downhill, and I haven't had any problems in about 5000km of riding since.

  • Could you provide a specific model of the brakes you use? Maybe they differ. – Euphorbium Jun 6 '16 at 5:40
  • Darn, calipers are BR-M615 but I didn't get a snap of the lever label (bike is hanging in the back of the shed). I bought them from Chain Reaction so probably these - they look the same. – Móż Jun 6 '16 at 7:26
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The brake will only suck in air if air is already present in the reservoir. With some brakes this may not be a problem. With brakes where this is a problem, you could take the rather extreme step of closing the reservoir while immersed in brake fluid (after carefully turning and vibrating to release air bubbles). No, I haven't tried, and yes it would be a lot easier if you could find a brake system that by design never has air inside the reservoir.

  • I thought all (bicycle) brakes are designed to be filled so that the reservoir doesn't have air in it? You seem to be suggesting that there are brakes that aren't - they're supposed ot have air there? – Móż Jun 6 '16 at 10:08
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There are several models of recumbents that use under-seat steering and hydraulic brakes. My 2005-era Anthrotech trike used them exclusively, and I never had trouble with them. As long as they are installed and set up correctly you should not be worried. Remind the bike shop they can install the system with the handles horizontal first if they persist in being really nervous about it, then they can mount them as you need. :)

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