 OK I need some brake help.., Dammit |
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| 914werke |
 Jul 11 2026, 05:31 PM
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#1
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"I got blisters on me fingers"  Group: Members Posts: 11,691 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest 
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So Ive done a lot of brakes, but this is the first time Ive experienced this one.
Had a OE MC fail, got my hands on one of the NEW 17mm units, Replaced F. calipers with rebuilt, + all the soft lines, the MC & the (Blue) res. line sections. All went as expected. No drama just the typical PITA installing the MC. Went about bleeding & got the pedal to near the point I thought I was done when testing a full pressure hold ...the pedal travel "breaks" & continues to the floor. (IMG:style_emoticons/default/headbang.gif) I think Ive got a leak but inspection shows its all still dry... (IMG:style_emoticons/default/blink.gif) Can a MC fail internally? Anyone witha BTDT? |
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| Ninja |
Jul 11 2026, 05:51 PM
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Member Group: Members Posts: 236 Joined: 25-September 25 From: Granbury Texas Member No.: 29,004 Region Association: Southwest Region |
The aftermarket (usually Chinese) ones do all of the time.
Sometimes they wait 2 to 3 weeks and only fail when your customer really needs it... Do the pressure/fails/drops to floorboard a few times. See if master fluid level stays the same. If so, they only thing can it can be doing is internal bypass in the master. Bad master! I LOATHE aftermarket stuff now... |
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| 914Sixer |
Jul 11 2026, 06:05 PM
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#3
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914 Guru Group: Members Posts: 9,515 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Rich,
Did you bleed the MC before installing? I can send you one of my aftermarket German ones to try. |
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| 914werke |
Jul 11 2026, 06:07 PM
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#4
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"I got blisters on me fingers" Group: Members Posts: 11,691 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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QUOTE(Ninja @ Jul 11 2026, 04:51 PM)  pressure/fails/drops to floorboard a few times. See if master fluid level stays the same. If so, they only thing can it can be doing is internal bypass in the master. Bad master! Help me out the plunger circuit is a Aluminum piece with a pair of wiper seals, behind it is a pretty beefy spring? What fails, the spring? |
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| 914werke |
Jul 11 2026, 06:08 PM
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#5
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"I got blisters on me fingers" Group: Members Posts: 11,691 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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QUOTE(914Sixer @ Jul 11 2026, 05:05 PM) Rich, Did you bleed the MC before installing? I can send you one of my aftermarket German ones to try. I did. (IMG:style_emoticons/default/wacko.gif) Edit: pulled the wheel, pedal board & the cluster plunger rod .... now has .5 or more travel before it contacts the plunger (IMG:style_emoticons/default/chair.gif) WTH! Depressing the pedal there is a definite *break* in the travel feels like a mechanical failure. (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/popcorn[1].gif) Mark Ill take you up on that offer. Now I gotta recall where this one came from. (IMG:style_emoticons/default/dry.gif) |
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