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Old 08-09-2012, 07:31 AM   #1
CDN_bacon
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Rear Master Cylinder Issues

Patient: 2004 CRF 250X

Case: I changed my brake lines to Galfer steel braided type. No issues with the front brake. Rear: I can't get pressure on the pedal when pumping. I've tried:
  • pump & bleed method
  • using a brake vacuum to pull air through
  • reverse bleed using a syringe
  • leaving in a clamp on the work bench for days to try to let any air make its way out
  • tear down and inspect the master cylinder (all in perfect condition)
  • connecting the brake line to the caliper, priming the line vertical and straight using a syringe then hooking up to the master to ensure air is out
  • tearing my hair out
  • drowning in vast amounts of beer night after night scratching my head

I just can't seem to get pedal pressure. I did read on TT that sometimes new lines come defective but I put the old line back on and zip, same thing. I did manage to pump and bleed about 4 fills through but no pressure.

Idea's? Help?
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Last edited by CDN_bacon; 08-09-2012 at 07:32 AM. Reason: adding
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Old 08-09-2012, 07:38 AM   #2
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Are you bleeding AT the master first before you bleed at the caliper?
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Old 08-09-2012, 08:14 AM   #3
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you can't bleed from the master. Only at the caliper.
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Old 08-09-2012, 08:39 AM   #4
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I might be way off, but don't both sides of the master cyl. need to be primed for the pressure differential or it isn't going to work.
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Old 08-09-2012, 09:16 AM   #5
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Quote:
Originally Posted by CDN_bacon View Post
you can't bleed from the master. Only at the caliper.
There isn't a banjo bolt connecting the brake line to the master?
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Old 08-09-2012, 09:19 AM   #6
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Quote:
Originally Posted by CDN_bacon View Post
you can't bleed from the master. Only at the caliper.
although you may not have a bleeding nipple you do you a banjo bolt. pull lever, crack bolt, fluid/air goes out, close bolt.

ive always had a problem with my tlr front system, still do, but i just rebuilt the MC havent put it back together yet. we shall see.
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Old 08-09-2012, 09:51 AM   #7
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Quote:
Originally Posted by mx6er View Post
although you may not have a bleeding nipple you do you a banjo bolt. pull lever, crack bolt, fluid/air goes out, close bolt.

ive always had a problem with my tlr front system, still do, but i just rebuilt the MC havent put it back together yet. we shall see.
Bingo
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Old 08-09-2012, 02:44 PM   #8
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well?
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Old 08-09-2012, 03:04 PM   #9
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bleeders apart caps off

I've got these all over my TL.brake MC, 2 front calipers, rear MC, clutch MC.

Can't say yet how well they work as my bike is still apart. Bug hopefully they'll save me a headache or two
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