Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner

02 Envoy Soft brake pedal

1656 Views 69 Replies 12 Participants Last post by  Horace P McTitties
Ok, so this is sort of a whipped horse thing. I see many post and no real solution. I see people saying that these vehicles pedal feels very different than most vehicles.

I bought this vehicle used from a Ford dealership where my father was a salesman. He had it checked over before driving it from Maine to South Carolina to me. The mechanics there said nothing about the brakes. But, they have never felt the way I expect brakes to feel.

Several years ago I had it in the GM shop for something and nothing was ever said about the brakes

Cut to today 13 years later and about 60,000 miles later I am throwing money at the braking system. I have replaced all calipers, pads and disks. Bled, and still felt soft. With Rav's assistance we determined that I probably should replace the MC due to black brake fluid and assuming seal deterioration. I have now replaced that and gravity bled the entire system with about 3 qts of fluid (I had flushed them 6 or so months ago) as I wanted to ensure it was completely flushed. I have a scanner and did an ABS bleed 2 times. Still brakes are the way they always have been.

What I have noticed is that when I press the brake in I hear a rush of air in the cabin. It will stop as soon as I stop pushing and hold the brake without letting off of it. Is this normal with this vehicle?
21 - 40 of 70 Posts
Mushy is wrong on all levels.
Still .... no-one has asked .... <sigh>
OK, I'll be the one to ask. What is your tip?
OK, I'll be the one to ask. What is your tip?
One cannot get the air out of the ABS control system by manipulating the servos with a scanner unless one might want to disconnect the bracket(s) that hold it in place and tilt the whole assembly so that the outlet lines point high - pointed skyward and are twisted to the top of the housing as possible.

THEN the air is really gone and no more Mr Mush.

I do this on my wife's 2000 Astro and they got rock solid.
My wife's 2005 Silverado was the same way --- mushy - but not any more.
My 2005 TB is solid as it sits and doesn't need anything at this time.

I'll say this ---- always use brake line hoses clamps EVERY time you work on your brakes so you don't empty the system like an empty Sparkletts bottle.

NEVER allow a master cylinder to get so low that it pushes air into the ABS system either. Bench bleed and then mount the MC and use your fingers as valves to bleed the MC again once it's mounted on the booster.

Here's a tip ---> IF the vehicle has drum rear brakes, have the parking brake applied HARD and then release it to let the rear brakes push fluid toward the MC, keeping air out of the rear lines.
THEN you first do the ONLY "press the pedal" bleed of the MC ---> then do a gravity bleed on all 4 positions with a small bottle of brake fluid installed upside-down in the neck of the MC reservoir - like an office water cooler. It helps to keep from you screwing up and having to go at this all over again. .​

After things are buttoned up, I don't like to press the brake pedal to attempt to bleed it anymore as it might force air into the system.

A system that is working might have some very small bubbles of air in it (did you rap the calipers with a plastic hammer to move those tiny bubbles up to the bleeder? Huh? Nobody thinks of that air!).

There are sequences to follow.
See less See more
  • Like
Reactions: 1
Thank you!
I am dealing with a similar issue with my 03 Envoy with 160k miles. I recently replaced the pads but the rotors looked fine. After a few months of driving, my front brakes started making a squeaking noise when I depressed the brake pedal. It makes the same noise when the truck is off. It sounds like it is coming from both sides and even under the hood. The sound is more like a cable that needs lubrication, but I don't think there is a cable from the pedal to the brakes. I lubed the pedal itself but that is not the source. If anybody has any ideas I would appreciate your advise.
Did you use the hardware pack that came with the pads? And lubricant?
  • Like
Reactions: 1
Did you use the hardware pack that came with the pads? And lubricant?
Yes on both. But why would it make the noise when the truck is off?
The brakes can still be applied even when the engine isn't running. This is a given.

I'd have to hear the noise for a better assessment though ......
William Bendix
  • Love
Reactions: 1
William Bendix
Winner --- Winner --- Chicken Dinner!
Jackie Gleason.
Jackie Gleason.
Gimme back my chicken dinner .....
I take it that means I was correct.

Not sure about the new avatar so I'm going to pass on this round.
Gotcha!

Sir Basil ...
as in Rathbone? I would not know him - way, way, before my time (or interests).
Sir Basil Fawlty
Has to be a character's name. From what I do not know. Heck that could be a young Dabney Coleman.

OK, so it's John Cleese. I had to dig a little, but without your hint, I would have been stumped.
Has to be a character's name. From what I do not know. Heck that could be a young Dabney Coleman.

OK, so it's John Cleese. I had to dig a little, but without your hint, I would have been stumped.
Here's an episode ...

Thanks Max!
That's "Maxx" to you.
21 - 40 of 70 Posts
Top