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Thread: 86GT brakes being "spongey"

  1. #1
    Rollin in my 5.0 Shorty429's Avatar
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    86GT brakes being "spongey"

    After pulling my car out for spring my brakes feel as if they're not even there! If I pump them once or twice they work fine. The brake fluid is good and full, could this be my brake booster going bad? HELP!

    Black
    1998 GT- PI swap, 3.73's, off road h pipe, flows & some suspension goodies

    White 1986 GT T-Tops- BBK shorties, RAM clutch/flywheel, Bassani catted x pipe, MSD ignition, MAC cai, LMM lowering springs, adjustable skocks & struts, MGW short throw, DD

    Black 2009 Yamaha YZF-R6- custom levers, -1 front sprocket, Jardine GP-1 exhaust, HIDs, custom undertail, custom black windscreen.

  2. #2
    No Traction due to Paxton PaxtonShelby's Avatar
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    Is the fluid level low? Maybe your rear wheel cylinders are seeping?
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  3. #3
    Rollin in my 5.0 Shorty429's Avatar
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    Fluid level was a little low but I topped it off and now it is fine. How do I check my rear wheel cylinders?

    Black
    1998 GT- PI swap, 3.73's, off road h pipe, flows & some suspension goodies

    White 1986 GT T-Tops- BBK shorties, RAM clutch/flywheel, Bassani catted x pipe, MSD ignition, MAC cai, LMM lowering springs, adjustable skocks & struts, MGW short throw, DD

    Black 2009 Yamaha YZF-R6- custom levers, -1 front sprocket, Jardine GP-1 exhaust, HIDs, custom undertail, custom black windscreen.

  4. #4
    Senior Member bluenotch's Avatar
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    just pull a wheel or both and then the drums and if its wet there bad just did 2 in my notch much better

  5. #5
    Rollin in my 5.0 Shorty429's Avatar
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    Thanks. I'll check it out in the morning. Are they expensive to replace?

    Black
    1998 GT- PI swap, 3.73's, off road h pipe, flows & some suspension goodies

    White 1986 GT T-Tops- BBK shorties, RAM clutch/flywheel, Bassani catted x pipe, MSD ignition, MAC cai, LMM lowering springs, adjustable skocks & struts, MGW short throw, DD

    Black 2009 Yamaha YZF-R6- custom levers, -1 front sprocket, Jardine GP-1 exhaust, HIDs, custom undertail, custom black windscreen.

  6. #6
    No Traction due to Paxton PaxtonShelby's Avatar
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    Pull the rear wheels and remove the drums. If the wheel cylinders are leaking you'll have a bit of a mess inside the drum. If the fluid level was low it has to be going somewhere. If the wheel cylinders look ok, I'd go thru the whole system checking all the lines, hard and rubber. Get someone to pump the brakes with the car off - and listen and look for leaks. The brakes in my wife's '66 went out once when the master cylinder ( the old single-bowl style ) took a dump, and it can be a very scary thing. It was the first day I had taken the car out after winter hibernation. I was lucky nothing bad happened - I was able to pour fresh fluid in and limp the car home.

    They aren't expensive to replace. Maybe $20 a side tops?

    Good luck - let us know what you find.
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  7. #7
    Senior Member bluenotch's Avatar
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    no there like 8 to 10 bucks a piece. cant remember just did thiss sat to got bad memory hah

  8. #8
    Rollin in my 5.0 Shorty429's Avatar
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    Now that's a price a poor college kid can afford! haha

    Black
    1998 GT- PI swap, 3.73's, off road h pipe, flows & some suspension goodies

    White 1986 GT T-Tops- BBK shorties, RAM clutch/flywheel, Bassani catted x pipe, MSD ignition, MAC cai, LMM lowering springs, adjustable skocks & struts, MGW short throw, DD

    Black 2009 Yamaha YZF-R6- custom levers, -1 front sprocket, Jardine GP-1 exhaust, HIDs, custom undertail, custom black windscreen.

  9. #9
    No Traction due to Paxton PaxtonShelby's Avatar
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    I guess I was thinking about the prices for the '66 rear wheel cylinders - just looked them up & they're around $18. I haven't done any fox repairs in a LONG time!
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  10. #10
    Senior Member blizzard's Avatar
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    i have one raybestos unit you can have, yes, only one

  11. #11
    Rollin in my 5.0 Shorty429's Avatar
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    Quote Originally Posted by blizzard View Post
    i have one raybestos unit you can have, yes, only one
    Let me check them out and I'll get back to you. I appreciate the offer!

    Black
    1998 GT- PI swap, 3.73's, off road h pipe, flows & some suspension goodies

    White 1986 GT T-Tops- BBK shorties, RAM clutch/flywheel, Bassani catted x pipe, MSD ignition, MAC cai, LMM lowering springs, adjustable skocks & struts, MGW short throw, DD

    Black 2009 Yamaha YZF-R6- custom levers, -1 front sprocket, Jardine GP-1 exhaust, HIDs, custom undertail, custom black windscreen.

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