yxiong Posted September 21, 2009 Share Posted September 21, 2009 I changed the brake fluid this weekend. A friend was using a pump to suck the old fluid out from the brake lines and we got a lot of air into the system (did not notice the brake reservoir has two halves and I was watching from the front only!). We ran two bottles of fluid through the system and did bleeding a few times. The brake feels ok afterwards as I could not tell whether there is a big air issue or not. I am kind of concerned and the question is: how can I tell if there is still some air in the system (say, master cylinder)? Thanks. Link to comment Share on other sites More sharing options...
wildest5 Posted October 20, 2009 Share Posted October 20, 2009 You would notice a completly different feel in the pedal. While pressing it you would notice a lot more of a spongy feeling because you are compressing the air and fluid is not compressable. Link to comment Share on other sites More sharing options...
AZP Installs Posted October 20, 2009 Share Posted October 20, 2009 You might want to bring it to a place that is experienced in bleeding/flushing brakes. For $100 it's worth it to have peace of mind. -mike Link to comment Share on other sites More sharing options...
magnetic1 Posted October 20, 2009 Share Posted October 20, 2009 Pedal might feel firm, then soften. You can reflush and reuse the fluid since it is all new. Just keep circulating until you get no bubbles. You can also take AZP's suggestion and pay $100 to save yourself the hassle Free Sonax Cleaner Deal http://www.brakeswap.com Carbotech, Hawk, PFC, DBA Rotors, Motul, Wilwood, Castrol... Great service. No bumping required ! Link to comment Share on other sites More sharing options...
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