Question about 1976 Yamaha XS 500

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76 xs500 Yamaha - I need a front brake master cylinder...I can bleed front but fluid not returning from caliper to cylinder.

When squeezing caliper, maybe a couple of small bubbles appear and no more.

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  • 342 Answers

Be patient keep working it get all the air out of the system.

Posted on Oct 28, 2012

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Posted on Jan 02, 2017

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DickCanFixIt
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SOURCE: Soft front brakes after bleeding the brake lines,

One easy thing to try is clamp the front brake lever overnight. If there are any air bubbles in the system they should be compressed and in theory work their way to the highest point in the system - the master cylinder. Doesn't always work but the price is right.
My experience has been air enters the calipers more than it does the master cylinder due to miscommunication between the person squeezing the lever and the person opening the bleed screw. They do have bleed kits these days that make it a little easier.

Posted on Apr 06, 2009

DickCanFixIt
  • 948 Answers

SOURCE: Front brake master cylinder wont pump fluid

Yes, you can buy a master cylinder rebuild kit. If you can't find a rebuild kit the whole thing can also be replaced.

Posted on Jun 27, 2009

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How do you decompress brake caliper?


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I've taken off the front brake hose & drained my front brake caliper. After re-assembly I can't get any pressure built up in the line. When I squeeze the brake lever it's totally free/loose/floppy. Can u...


Hi, The lines have to be bled to get the air out. There is a small fitting on the calipers to do this. The best procedure is to use a piece of tubing and a glass jar. Fill the fluid reservoir up to the top. Put some brake fluid in the jar, barely open the fitting, squeeze the brake lever and watch for bubbles, pump the lever until there are no more bubbles and it tightens up. Be careful not to run the reservoir too low and get air back in the line. This should Fixsya!

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