Air In Braking System ?

barnesy213 · Two Stroke Sniffer Joined: 24 Nov 2014 Karma :

basically as the title suggests i think i may have some air in the system on my bike (2009 honda cbr 125) .

when i press my foot on it (back brake) there is hardly any feel in it , its like a switch either on or off and also when i have the back brake on when i'm on a hill it will start to roll back and make a creaking noise untill i apply more pressure too it , but if i use the front brake its fine and the front has plently of feel in it.

so i'm wondering if there is air in the system or if some parts may need replacing .

any help is much appreciated many thanks .

DrSnoosnoo · World Chat Champion Joined: 28 Mar 2012 Karma :

The way to check would be to try and bleed the system, do you know how to do this?

EDIT- is there fluid in your reservoir?
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Andy_Pagin · World Chat Champion Joined: 08 Nov 2010 Karma :

Sounds more like a seized calliper to me. Air in a braking system either manifests itself by excessive lever/pedal travel, or a 'spongy' feel to the pedal movement.
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barnesy213 · Two Stroke Sniffer Joined: 24 Nov 2014 Karma :

Yeah i know how to bleed brakes , but would rather someone else help so i know i'd be getting it right lol and yes the brake fluid in reservoir is upto the max line .

[quote="snoosnoo"]The way to check would be to try and bleed the system, do you know how to do this?

EDIT- is there fluid in your reservoir?[/quote]

barnesy213 · Two Stroke Sniffer Joined: 24 Nov 2014 Karma :

well what happens is when you press it nothing really happens then press it a tiny bit more and you can feel it slowing but sometimes it locks on , quite dangerous tbf

[quote="Andy_Pagin"]Sounds more like a seized calliper to me. Air in a braking system either manifests itself by excessive lever/pedal travel, or a 'spongy' feel to the pedal movement.[/quote]

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Sounds like a piston sticking. Never mind bleeding, give your caliper and pistons a good clean and inspection.
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monkeybiker · World Chat Champion Joined: 23 Sep 2014 Karma :

Are they the slide type brakes were you have pistons just on one side? Sometimes the sliding part can get stuck.

DrSnoosnoo · World Chat Champion Joined: 28 Mar 2012 Karma :

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

If it feels like an on/off switch, it's sticking. The rear caliper on the CBR125 is a traditional single piston sliding caliper, so there are lots of bits that can wear or seize. The whole things needs a strip down and clean, including removing the piston and seal and scraping out any corrosion from under the seal.