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E34 (1989 - 1995)

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  #1  
Old 10-24-2014, 12:00 PM
Cheinzz Cheinzz is offline
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Location: Cali
 
Join Date: Sep 2014
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Mein Auto: 1989 535i
brake help

hi everyone I am about to do a brake job on my 1989 535i and was wondering if there is a certain way to bleed the brakes? I was going to start on the farthest away from master cylinder and work my way around. is there anything else I should know?
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Old 10-24-2014, 12:17 PM
capricornbmw capricornbmw is offline
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Mein Auto: E36
Nothing special. Use gravity bleeding, or pressure or vacuum bleeding.

Oh yes, you need to do something called calliper piston bleeding. With the bleeder screw open, use a flat screwdriver to squeeze the caliper piston back. There's always alot of dark fluid and mud trapped behind the pistons and they don't often get removed during normal bleeding.

Keep pushing the pistons in, letting them pop back out, fill up with new fluid, and push them back into the calliper, until the fluid that runs out is clear. Then proceed to do a usual bleed and you are done with that wheel.

Do this for all four wheels and you might have to remove the tyres to help you access the calliper.

You'll have good and tight brakes.

And to ensure that you don't have to do this anytime soon, use Dot 5.1 non-silicone oil. It gives you an extra 50% timeline between brake fluid changes. Of course, it is more expensive too....stick to dot 4 if you anticipate brake work coming up soon (such as changing your brake lines to stainless steel ones....highly recommended, just don't buy off ebay, buy techna fit hoses and you're settled.)
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