Lost power brakes, rough idle
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Cadillac STS Forum - 2005 through 2012 Discussion, Lost power brakes, rough idle in Past Cadillac Vehicle Discussion; I parked my 06 N* awd this morning, went in McD's, came back out and started her up. Started up ...
  1. #1
    jonesjacob1 is offline Cadillac Owners Member
    Automobile(s): 2005 sts
    Join Date
    Mar 2012
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    Lost power brakes, rough idle

    I parked my 06 N* awd this morning, went in McD's, came back out and started her up. Started up fine, but idled rough. Have her some throttle and runs smooth at all rpms above idle. Then noticed my brakes were gone.. Just takes both feet to stop jet now I didn't see any obviously loose vacuum hoses... are there some connections I should check anyone knows of?

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  3. #2
    jonesjacob1 is offline Cadillac Owners Member
    Automobile(s): 2005 sts
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    Thread Starter

    Re: Lost power brakes, rough idle

    The brake booster vacuum hose came off one end. The end behind the motor. .. Anybody know where it connects to? The house is pre bent so I know I'm close, I just can't see where the port is that it connects to.

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    I can hear the open connection hissing behind the motor, I just can't get my hand on it! Help!

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    Got it. Wow that was a PITA. The port is centered, directly underneath the intake plenum flagflush with the motor block.

  4. #3
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
    Automobile(s): 2006 STS4 V8 1SG & 2007 STS V8 1SE
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    Re: Lost power brakes, rough idle

    A quick winner!

    Congrats!

  5. #4
    B1n2fra's Avatar
    B1n2fra is offline Cadillac Owners Fanatic
    Automobile(s): 2007 1SG Cadillac sts v8 awd
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    I had the same issue last year. Just chased the hissing down with a flash light. It its a pita to reconnect it though. Just takes determination.

  6. #5
    carter's_sts is offline Cadillac Owners Connoisseur
    Automobile(s): 06 STS-V & 06 STS 4
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    Is there a clamp missing or something? Why do you guys think it came off?

  7. #6
    orange57's Avatar
    orange57 is offline Cadillac Owners Enthusiast
    Automobile(s): 2005 STS Northstar RWD
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    I had the exact same issue after a trans swap. I don't think there is any clamp, just a hose on a barb fitting.

  8. #7
    jonesjacob1 is offline Cadillac Owners Member
    Automobile(s): 2005 sts
    Join Date
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    Thread Starter

    Re: Lost power brakes, rough idle

    No clamp or anything. Just a single barb. If must have just wiggled itself off somehow. All has been well so far. Engine light even reset.

  9. #8
    B1n2fra's Avatar
    B1n2fra is offline Cadillac Owners Fanatic
    Automobile(s): 2007 1SG Cadillac sts v8 awd
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    No clamp. I was gonna put a clamp on it but it was hard enough trying to put the Damn thing back on

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