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brake bleed - engine on or off when bleeding?

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Hey guys

I just did a brake fluid change and was wondering... should you do this with the ignition on (to enable the brake booster - (just thinking, is the brake booster even enabled without the engine running? Haven't tried that one), or with the ignition off (assuming the engine doesn't have to run). I'd assume if anything, having the brake booster activated would only assist in reducing the effort to expell the fluid as opposed to expelling additional air from the system. Any thoughts?
 
Joined
5 January 2006
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Thanks guys. I actually tried it out when I got home last night. The brake booster is only activated when the engine is running so having the ignition "on" is unnecessary. Doh!, should have tried that before posting. I finally have access to a digital camera so I'll get some photos of my Sil on the site shortly.
 
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