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I bought a new gravel bike (Serious Grafix Pro) with SRAM hydraulic disc brakes. The rear one has very weak stopping power.

I can pull the right/rear brake lever completely to the handlebar and the pads just softly touch the rotor. So I'm wondering if I can just e.g. tighten a screw to make it more sensitive.

How can I adjust it? I found many Youtube videos, but none I needed.

Sorry for my lame question, not particularly strong for (not only) bike mechanics.

Thanks

  • Is the brake slipping or is it just easier to bottom out the rear brake lever than the front. You're not giving us much to go off. – Philip Gibbons Mar 29 '17 at 14:16
  • I can pull the right/rear brake lever completely to the handlebar and the pads just softly touch the rotor. So I'm wondering if I can just e.g. tighten a screw to make it more sensitive. – Radek Skokan Mar 29 '17 at 14:45
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    @RadekS Sounds like they need a bleed. Is there fluid leaking from anywhere on the rear brake/brake line/caliper? – Philip Gibbons Mar 29 '17 at 14:49
  • @PhilipGibbons, I will check it in an hour, but didn't notice any leaking yesterday when I got it. Is it normal for a new bike? My MTB that was also sent to me has brakes just strong, rock solid out-of-the-box (literary). – Radek Skokan Mar 29 '17 at 14:53
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    If you can squeeze the brake lever all the way to the handlebar, then something is definitely wrong. This rule applies to all brakes, not just hydraulics. Since this is a new bike, you should take it back to the shop and have them fix it. – Mike Baranczak Mar 29 '17 at 16:11
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Sounds like you need a brake bleed, as mentioned in the comments. If there is air in a hydraulic system, the brake levers feel "spongy", or may not actuate the brake enough at all, which is what this sounds like. Any time you can squeeze a brake lever all the way to the grip, that's a dangerously underpowered brake. Brake bleeding is a process, and while you can do it yourself, it's usually recommended to take it to a shop, as it is easy to mess up, and messing up on a brake bleed can mean you ruin pads/hoses/calipers/levers, and can get costly.

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