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Bleeding Brake Lines


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I did it yesterday.

Braided lines, new fluid, pads and rotors.

It took a fair while but wasn’t that hard.

I got most of the old fluid out of the master cylinder with a syringe, and then filled it up with the new stuff.

The old fluid was dark green and the new stuff was very close to yellow.

So I just bled (RL, RR, FL, FR) until the yellow fluid came through.

Brakes feel good now. :thanks:

Thanks for everyone’s help.

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here are some useful way!

There are three different ways to bleed the brakes, depending on which tools you have.

With all three procedures, remember that it is vitally important (as in, you could die if you don't) to keep the brake's hydraulic system clean and free of dirt, water, or any other impurities. Any foreign material in the braking system can result in the brakes failing to function either in normal operation or in extreme operation (like when you're braking hard and really need your brakes to work), or in them binding up. Any of these situations is obviously very bad; be as clean with the brakes as possible. It's ok if the outside of the braking system (like the hoses, reservoir, calipers, etc.) gets dirty, this is normal and safe. It's the inside you have to be concerned with.

Be aware that when you pull the brake lever, hydraulic fluid can shoot up out of the reservoir with a good bit of force. Remember that brake fluid will strip paint, so keep it cleaned up if any spills.

These procedures apply equally to the front or rear brake. They're mostly phrased as if working on the front brake, but you can replace "lever" with "pedal" in any of these instructions. The key differences are that the rear reservoir won't "spit" much or at all when you jam down on the pedal, and it's easier to get bubbles out, since the line is mostly horizontal.

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  • 12 years later...
On 09/09/2008 at 9:09 AM, Waza_GTR said:

If you are starting from empty after changing the brakes you have to do the fronts first, then the rears , then the fronts again. This is because you need to get pressure in the fronts to open the proportioning valve to the rears.

This is correct. 

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