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Thread: Truck Norris has a brake leak. I think I found it

  1. #1

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    1991 Mitsubishi Mighty Max
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    Truck Norris has a brake leak. I think I found it

    1991 3.0 Mighty Max 4x4 Truck Norris Edition

    So I am moving as fast as I can to get this truck back on the road

    It has a brake leak - it looks to be behind the brake fluid reservior

    What is that round part? What do you think that I need to replace?

    I can get a below pic if needed



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  2. #2

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    Looks to be a break booster - which is apparently a vaccum. Is this part easy to swap out?
    The big round thing behind it appears to be the master cylinder i guess

  3. #3


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    If it's leaking fluid then the O ring on the master cylinder is either shot or worn out.Replace the MC and leave the booster alone.

  4. #4



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    Unless the booster has break oil in it. Then it's bad also.
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  5. #5



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    x2 0n the MC replace - typical place to leak - about $45 on ebay
    Pennyman1
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    Living the D-50 lifestyle since 1980

  6. #6

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    Truck Norris status update. I replaced master cylinder, starter, alternator, ignition coil, rotor, distributor, fuel filter and gave it an oil change and dumped the gas.

    Break leak is gone! However the truck runs great when you drive it around, but when sitting idle it kind of reminds me of a harley. It's like it's puttering in/out of time and if I don't give it gas, at times it just shuts off. What do you think? Timing belt?

  7. #7

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    Right on the money sir! Bad seal in MC - break booster is fine

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