Spongy Brake, less Brake-Power, changed all parts...
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Spongy Brake, less Brake-Power, changed all parts... - 10/11/2007 12:59:13 PM
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Hoelgi
Posts: 21
Joined: 9/2/2007
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Hi!
Since I bought the Blazer it's brakes are horrible! The pedal feels very spongy, so I tried this things:
new Brake Pads for the Drumbrake
new Brakepads and Discs
new master cylinder
new brake tubes front and rear
new brake combination valve instead of the ABS-valve, because here in Germany nobody has this obd-computer to bleed the abs
And I bleeded the System 3 times with an adapter that gets the brakefluid under pressure in the master cylinder...
Nothing changed! Any ideas? Could the power brake be "a little bit broken"? I mean, you feel a great difference when the motor runs, so I think the power brake is ok. But when I brake I feel a little crack in the pedal, but there ist no backlash/play in the pedal.
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/11/2007 7:22:09 PM
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blazin97
Posts: 1675
Joined: 11/16/2004
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try starting the truck and then hold the brake pedal. If it stops then slowly sinks to the floor its your master cylinder
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Chris
97 Blazer 2DR/2WD-down for some upgrades
97 Blazer 2DR/4WD/4.3/5Spd/31s/rusted
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/11/2007 11:17:06 PM
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Chevy Lover
General Tech Moderator
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From: Vancouver. B.C. Canada
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Using quality brake pads and shoes with a higher mettalic content make a big difference over using the inexpensive low quality parts.
I have used some cheap brake parts before to save money and the truck almost would not stop. I changed to more expensive pads and shoes and the truck stopped very well.
To check the brake master cylinder, with the engine turned off pump the brakes a few times until the pedal is hard to push, then while holding the brake pedal start the engine and the pedal should go down a little. If it does then the brake booster is working.
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Give a man a fish and he will eat for a day, teach a man to fish, and he will sit on a boat drinking beer for a life time
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/12/2007 2:22:34 AM
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drperry
Posts: 3926
Joined: 1/12/2007
From: GP AB CA
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Does the truck stop good? Just the pedal feels spongy?
I know my Blazer isn't the firmest brake system I've driven... But it is a little on the spongy side, pedal wise, at least...
Find a wide open area and do some brake tests... unplug the ABS fuse and see if you can lock 'em up...
Granted, I'm sure that's not the safest or most professional way of testing them, but you can be going 50km/h or less and still lock 'em up, lol
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 5:54:37 AM
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Hoelgi
Posts: 21
Joined: 9/2/2007
Status: offline
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quote:
try starting the truck and then hold the brake pedal. If it stops then slowly sinks to the floor its your master cylinder
The master cylinder is brand new!
quote:
Using quality brake pads and shoes with a higher mettalic content make a big difference over using the inexpensive low quality parts.
The pads and discs are from Raybesto, this is standart quality, or not?
quote:
Does the truck stop good? Just the pedal feels spongy?
No, when it would stop good than I would live with it. I have to brake very strong to stop the blazer and I'm not sure if it would lock up at 50km/h...
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 6:19:30 AM
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drperry
Posts: 3926
Joined: 1/12/2007
From: GP AB CA
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Does the pedal vibrate like ABS is working, when stopping normally?
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 6:27:56 AM
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thegr81
Posts: 2639
Joined: 1/16/2007
From: PHOENIX,AZ
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what exactly is the pedal doing besides feeling spongy how far down do you have to press before you feel the brakes engaging for you to stop?
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2001 2wd 4.3 vortec v6
"I'm not fat, I'm a minitrucker"
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 6:33:56 AM
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Hoelgi
Posts: 21
Joined: 9/2/2007
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quote:
Does the pedal vibrate like ABS is working, when stopping normally?
No vibrations.
quote:
what exactly is the pedal doing besides feeling spongy how far down do you have to press before you feel the brakes engaging for you to stop?
There is no point where you can feel, that the brakes start braking. I drove a chevy Astro Van, same modellyear (95) with an servooil-powerbrake and you feel the point, when the pads "bites" into the discs. And it's no Problem to lock up the brakes from the Astro Van!
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 6:38:47 AM
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thegr81
Posts: 2639
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From: PHOENIX,AZ
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ok with abs on your vehicle it prevents lock ups when pressing the brakes hard. so on to spongy brakes lets see here you changed just about everything bled them 3 times and still spongy well i would still have to say i believe you still have air somewhere in the system thats what i can think of that is still causing them to be spongy unless someone else has a better idea, sorry i couldn't be more help other than that someone will think of what im not i know brakes pretty well and this one actually has me pretty stumped.
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2001 2wd 4.3 vortec v6
"I'm not fat, I'm a minitrucker"
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 6:45:42 AM
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drperry
Posts: 3926
Joined: 1/12/2007
From: GP AB CA
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Did you bleed the brakes at the calipers?
That's the method I've used for bleeding brakes... Usually a two person job, unless you've got a stick that can press the pedal down far enough when wedged against the seat, lol.
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 6:46:08 AM
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Hoelgi
Posts: 21
Joined: 9/2/2007
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I bled it with eezibleed. It pumps brakefluid through the masterylinder (with air prressure). But, I will triy to bleed the system again with the "pedal-pump-method", but before I will check the power brake, because I don't like this cracking feeling when I kick the pedal...
< Message edited by Hoelgi -- 10/14/2007 6:50:36 AM >
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 6:59:55 AM
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drperry
Posts: 3926
Joined: 1/12/2007
From: GP AB CA
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Cracking feeling?
That sounds... different... Any other way to describe that? lol
Reading up on the eezibleed thing... Looks pretty nifty...
Hopefully enough fluid was in there so no air got in the system...
As long as the fluid in the bottle stayed high enough, I don't think there should be much of a problem...
Can't hurt to check, though, right?
< Message edited by drperry -- 10/14/2007 7:01:11 AM >
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 8:05:57 AM
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Hoelgi
Posts: 21
Joined: 9/2/2007
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Yes, there was enough fluid in the bottle, but I don't know if the pressure was high enough to flush all of the bubbles out of the lines, so I will try the other method to be sure...
quote:
That sounds... different... Any other way to describe that? lol
:) don't know how to describe it... when I press the brakepedal a little harder, then you can feel a little "click" in the pedal. When I release the Pedal it "clicks" back. You know what I mean??
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 8:24:40 AM
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drperry
Posts: 3926
Joined: 1/12/2007
From: GP AB CA
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Is it a feel in the click, or does it make the noise?
Or are you talking about when you press it all the way down and then give it that little bit of extra squeeze?
I'm not sure if you're supposed to be easilly able to bottom out the brake pedal on these things with fresh brakes or not, so, hopefully someone else will know, lol.
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 12:07:57 PM
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Hoelgi
Posts: 21
Joined: 9/2/2007
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No noise, only the feel of a click
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/14/2007 5:33:41 PM
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drperry
Posts: 3926
Joined: 1/12/2007
From: GP AB CA
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Is the pedal at the floor when it makes the click, or somewhere in the middle? And is the click at all speeds when you brake, or just lower speeds?
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/17/2007 1:05:35 PM
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Hoelgi
Posts: 21
Joined: 9/2/2007
Status: offline
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The click is at all speeds and it's somewhere in the middle. And it's NOT from the power brake, because I detached the Master Cyinder und put it away form the power brakes. So I could press a hammer against the pin that came out of the powerbrake and a second person could brake against the hammer. There was no click at this time at no position!
Next step will be to detach one brake-circuit and than brake, so I can find out which brake-circuit is clicking...
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RE: Spongy Brake, less Brake-Power, changed all parts... - 10/20/2007 6:49:01 PM
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95_4door
Posts: 286
Joined: 9/16/2007
Status: online
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There is a good possibility that you have a bad master cylinder. Even though it is new, it could still be bad. The 'clicking' sound could be when the mc piston grabbing a seal as you push it in. I'v seen it happen more often then you would think.
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Bill
1995 Chevy Blazer
2wd 4 Door (was 4wd)
v8 Swap
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