Brake Pedal Question - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 05-19-2019, 05:42 PM
Stangyog's Avatar
Stangyog Stangyog is offline
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2004 GMC Envoy SLE XL
Summit White 4.2L I6 4X4
Join Date: Jun 2017
Location: Central PA
Posts: 66
Brake Pedal Question

So, I will explain this the best way I can... I have an '04 Envoy XL, when I push down on the brake pedal, the brakes come on like they should and will full lock-up (activate ABS) at probably 1/3 to 1/2 of pedal travel. But the pedal will then continue to travel to the floor. I do not have any fluid leaks, ABS works properly, no codes. Not sure if it could be a master cylinder or brake booster issue.

Any help ideas would be appreciated...

Thanks
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  #2  
Old 05-20-2019, 08:43 AM
Ponvoy Ponvoy is offline
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2004 GMC Envoy SLT XUV
Carbon Metallic 4.2L I6 2WD
Join Date: Sep 2018
Location: Houma, LA
Posts: 26
I had a similar issue with mine and it ended up being the master cylinder. Brakes always felt soft to me and eventually it got to the point where even pressing the pedal all the way down the truck still wouldn't stop! It's pretty easy to change. Just be sure to prime the cylinder with brake fluid before installing it and to bleed all four calipers after installation.
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Old 05-22-2019, 09:55 PM
greck48 greck48 is offline
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2004 Chevy TrailBlazer SS (LS)
Medium Red Metallic 4.2L I6 4X4
Join Date: Feb 2013
Location: holmen wi
Posts: 6
brake petal issue

When i depress the brake petal, about 2/3's down, it seems like abs kicks in.
I have read that the sensors on the wheels may have rust on them & wonder if that may
cause my problem?
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  #4  
Old 05-23-2019, 09:59 AM
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rcott01 rcott01 is offline
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2004 GMC Envoy SLT XL
Black 4.2L I6 4X4
Join Date: Feb 2016
Location: Eaton, OH
Posts: 57
I had a similar issue on a 2004 envoy xl I had as well. I tried just about everything over a 2 year span before I just went ahead and replaced both front hub bearings. Problem solved! I had even removed the sensors and cleaned them a couple of times, but it never solved anything until I just replaced the whole hub.
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Old 05-29-2019, 08:14 PM
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DinoGator DinoGator is offline
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2003 Chevy TrailBlazer LT
Champagne 4.2L I6 4X4
Join Date: Dec 2018
Location: Florida
Posts: 16
Have you hooked up a computer and completed an ABS brake bleed. This was my issue. I ended up buying a computer because the mechanics wanted $50-$100 and I bought mine for $100. It seemed to be the better option just in case I needed to do it again.
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