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Annoying brake issue

Discussion in 'XJ Technical Chat' started by Evan Hawtrey, Dec 30, 2017.

  1. Evan Hawtrey

    Evan Hawtrey Member

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    hello again all,
    So i have been having an issue woth my brakes for awhile.. kind of annoying.. rebuilt master cyclinder and calipers.. here’s my issue.. every once in awhile the brakes tighten and I can’t accelerate.. I have to stop and and crack open front bleeders and boom it’s great! What I’m the world.? Only thing I can figure is somehow that pinhole gets plugged in master cylinder? Thoughts?
     
    Evan Hawtrey, Dec 30, 2017
    #1
  2. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Or the Piston is binding up just a bit in the bore....or the o-ring is a bit dry...

    If you're running a 750 Seca, try pushing the brake lever back out the rest of the way. Sometime they get sticky and make it seem like the master cyl is the culprit
     
    hogfiddles, Dec 30, 2017
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  3. Rooster53

    Rooster53 Well-Known Member Premium Member

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    Did you replace the 30+ year old brake lines? Sticking brakes are a symptom of old lines that have deteriorated internally. The master cylinder can force fluid through the restricted passage, but the fluid can not return through the restricted line.

    Original brake lines should be replaced whether they are the cause or not, as they are no longer safe. Upgrading to steel lines will result in a very noticeable improvement in the brake system.
     
    Rooster53, Dec 31, 2017
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  4. Evan Hawtrey

    Evan Hawtrey Member

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    Like the brake lever is somewhat compressed?
     
    Evan Hawtrey, Dec 31, 2017
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  5. Evan Hawtrey

    Evan Hawtrey Member

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    Yeah I never replaced those.. I suppose I could
     
    Evan Hawtrey, Dec 31, 2017
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  6. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Yup... cuz the MC on the 750 seca is cable-operated, and the MC is tucked down in behind the headlight bucket
     
    hogfiddles, Dec 31, 2017
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  7. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    You really should. The inside of the line breaks down into litle bits; litle bits that are just the right size to block the master cylinder return port. The extra-fun-bonus part happens when the brake like ruptures just as you NEED to stop RIGHT NOW.
    The OEM lines had a service life of 4 years. Yours are coming up on being 40 pretty soon.

    Fitz's pics in the below thread are not restored yet, but there are pics on page 2 of what the inside of your brake lines look like.
    why-you-need-to-replace-original-brake-lines-w-pics.41400
     
    k-moe, Dec 31, 2017
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  8. Evan Hawtrey

    Evan Hawtrey Member

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    Well I remember bleeding my breaks after doing calipers and master and it worked for crap.. and my buddy is an ase mechanic.. maybe the lines were behind that? Decaying? Do I need a bleeder or can I do it with brake lever?
     
    Evan Hawtrey, Jan 1, 2018
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  9. tabaka45

    tabaka45 Well-Known Member

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    Both caliper bleed valves needing to be cracked indicates to me a problem with the master cylinder—likely caused by old brake lines breaking down and clogging up the works. If it is only one caliper that needs cracking then the problem is with that caliper. Brake line replacement is easy and needs to be done. Since you have the original brake lines I would at least clean the master cylinder and calipers to make sure that no brake line fragment are still in the system.
     
    tabaka45, Jan 1, 2018
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