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#4533699 - 10/04/17 11:15 AM Is my Hydroboost working?
LeakySeals Offline


Registered: 02/18/11
Posts: 6578
Loc: Hudson, NH
Sometimes it feels like my Escalade is not going to stop in time. I am on pedal hard, she still rolls to a slow stop. Pedal stays at the top, doesn't sink or fade. New pads, new rotors all around. Fluid exchanged and bled a few times. There is an occasional slight whine from the PS pump, but nothing out of ordinary. All the PS fluid was replaced when the steering gear leak was fixed this summer. No change. PS seems normal. I tried the pre startup brake test, the pedal pops up when I turn on the key.

What are the symptoms of Hydroboost fail?

Would a bad hydroboost unit only effect the brakes?
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4533796 - 10/04/17 12:33 PM Re: Is my Hydroboost working? [Re: LeakySeals]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
It's not going to stop like a Lotus.

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#4533939 - 10/04/17 02:50 PM Re: Is my Hydroboost working? [Re: LeakySeals]
bullwinkle Offline


Registered: 10/09/04
Posts: 7671
Loc: Cincinnati, OH, USA
When the one in my GMC went out, it required standing on the brakes with both feet to get it to stop, and power steering also lost assist when you stood on the brakes. A reman PS pump & hydroboost, with Red Line PS fluid, took care of it, the old PS fluid was BLACK!
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06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

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#4533955 - 10/04/17 03:02 PM Re: Is my Hydroboost working? [Re: bullwinkle]
LeakySeals Offline


Registered: 02/18/11
Posts: 6578
Loc: Hudson, NH
Originally Posted By: bullwinkle
When the one in my GMC went out, it required standing on the brakes with both feet to get it to stop, and power steering also lost assist when you stood on the brakes. A reman PS pump & hydroboost, with Red Line PS fluid, took care of it, the old PS fluid was BLACK!


I don't cut the wheel braking in this beast, its a bad idea. But for testing purposes off to a parking lot I go. grin
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4533991 - 10/04/17 03:57 PM Re: Is my Hydroboost working? [Re: LeakySeals]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
If your Hydroboost failed, trust me, you'd know it. And so, probably, would your Insurance Agent.
_________________________
'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]

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#4534019 - 10/04/17 04:33 PM Re: Is my Hydroboost working? [Re: LeakySeals]
JBinTX30 Offline


Registered: 09/08/14
Posts: 476
Loc: Texas
I get that sometimes as well in the Yukon, not sure what it is but I changed hydroboost (leaking) and a line and its better but, still does it sometimes.
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05 GMC Yukon XL SLT 5.3 EDGE 5w30
06 Chevy Trailblazer LS 4.2 PPPP 5w30

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#4534246 - 10/04/17 11:55 PM Re: Is my Hydroboost working? [Re: LeakySeals]
clinebarger Online   content


Registered: 12/19/13
Posts: 1918
Loc: Fort Worth, Texas
If the master cylinder piston is bottoming out...A hydroboost will have a high but very firm pedal unlike a vacuum booster sinking to the floor.
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2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto

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#4534374 - 10/05/17 07:53 AM Re: Is my Hydroboost working? [Re: clinebarger]
LeakySeals Offline


Registered: 02/18/11
Posts: 6578
Loc: Hudson, NH
Originally Posted By: clinebarger
If the master cylinder piston is bottoming out...A hydroboost will have a high but very firm pedal unlike a vacuum booster sinking to the floor.

Thats good to know. No doubt it was full of muck when I basted it.
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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