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Not full brakes on my '07 1500 Suburban


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jbassking
Novice

Jun 21, 2012, 9:27 AM

Post #1 of 19 (697 views)
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Not full brakes on my '07 1500 Suburban Sign In

I have a strange problem with my brakes. Sometimes the first time we take the truck out for the day the brakes don't work great. The pedal feels normal but the range isn't there. For example if I'm coming up to a stop sign and press on the brake the truck stops fine but if I press harder on the pedal to stop quicker, the pedal goes down more but there is no additional stopping power.
I tow a boat with this truck so I thought it was the brakes on the trailer because it's noticeable most times I have the boat attached. If I go to stop normal I have normal brakes but any additional pressure doesn't make a difference. I also don't seem to have good brakes in reverse at all.
Meaning that if I'm backing up and hit the brakes hard, the truck kind of comes to a slow stop rather than abrupt.
There is also the occasion when it feels like the ABS is engaging but no reason for it. I'm just backing out of my driveway at say 5MPH and I step on the brake. The truck doesn't really stop very well and it feels like the ABS is pumping the brake.

I have 140k miles on the truck and have had the brakes replaced many times.

One additional thing - it seems like we're going through rear brakes almost 2:1 the front.

Any suggestions what to look at?
Thanks


Hammer Time
Ultimate Carjunky / Moderator


Jun 21, 2012, 10:04 AM

Post #2 of 19 (674 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In


Quote
I tow a boat with this truck so I thought it was the brakes on the trailer because it's noticeable most times I have the boat attached.


That is likely the root of your problem. I'm betting you have totally overheated the brakes and baked the linings and glazed the rotors.




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jbassking
Novice

Jun 21, 2012, 10:20 AM

Post #3 of 19 (667 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

The brake parts are fine as far as the pads and rotors. We replaced all of them.
The trailer has 12" drum brakes on both axles and the boat/trailer weight about 5000lbs which shouldn't be a problem.


Hammer Time
Ultimate Carjunky / Moderator


Jun 21, 2012, 10:23 AM

Post #4 of 19 (664 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In


Quote
the boat/trailer weight about 5000lbs which shouldn't be a problem.


WHAT? It's a half ton truck with half ton brakes.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jbassking
Novice

Jun 21, 2012, 10:30 AM

Post #5 of 19 (660 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

Not sure if that's a question or a statement but like I get this issue without towing anything.
I don't know very much about ABS but isn't there something that controls brake flow to the front/back wheels? It almost seems like the front wheels don't get enough fluid and the backs are doing most the work.


Hammer Time
Ultimate Carjunky / Moderator


Jun 21, 2012, 10:43 AM

Post #6 of 19 (652 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

No, that's not how ABS works. You will know if ABS ever kicks in. You're just overloading the system and glazing the brakes over.




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jbassking
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Jun 21, 2012, 10:53 AM

Post #7 of 19 (647 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

That can't be the case. We replaced all the pads and rotors and did NOT toe the boat and we still have the same problem.

How is it even possible that 5000lbs with massive brakes on the trailer can possibly overload a 1500 suburban which is rated for a lot more.
My old 1500 Silverado never had this problem and that truck had front disk and rear drum. My suburban has 4 wheel disk with dual piston calipers


Tom Greenleaf
Ultimate Carjunky / Moderator


Jun 21, 2012, 10:54 AM

Post #8 of 19 (647 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

Been there done that except plain inertia brakes on BOAT trailer. It's too heavy AND common (to me anyway) with a boat that heavy to have to submerge the trailer over entire thing to take off or put back on and soaking wet brakes (drum anything) don't dry out and help for crap for a while.

You are baking the crap out the Suburban's brakes not rated for this,

T
_________________________________________
Long retired now


Hammer Time
Ultimate Carjunky / Moderator


Jun 21, 2012, 11:06 AM

Post #9 of 19 (640 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

Believe me. I'm not new to towing a boat with a GM vehicle. I did it for years and I saw how overtaxed the brake system was.
It can have a lot to do with the brand of brake pads you're using too. Some of them just have way too much metal and the result is no friction. Don't fall for that lifetime guarantee crap. That just means more metal and less friction material.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jbassking
Novice

Jun 21, 2012, 11:11 AM

Post #10 of 19 (631 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

OK - I'll replace everything again. What would you recommend for brake pads and rotors?

At the end of July I'm putting 4 disc brakes on the trailer to see if that helps as well.


Hammer Time
Ultimate Carjunky / Moderator


Jun 21, 2012, 11:17 AM

Post #11 of 19 (628 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

Wagner makes some quality stuff and so does Raybestos but most of these discount houses are selling Chinese made private brands that they can sell cheap. You should \pay between $40 and $75 for a good set of pads.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jbassking
Novice

Jun 21, 2012, 11:31 AM

Post #12 of 19 (623 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

What type - semi metallic, ceramic, etc...?
What about rotors? Does it matter?

I can get them at Napa


Tom Greenleaf
Ultimate Carjunky / Moderator


Jun 21, 2012, 11:38 AM

Post #13 of 19 (617 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

Centric for both is best bet IMO (ceramic) but if this was made to haul that weight all parts on brakes would have been much heavier. Own a GM truck with HD brakes on 3/4 ton but enhanced towing capacity too - dang rotor and drums on that each weight more than I do!

T
_________________________________________
Long retired now


Hammer Time
Ultimate Carjunky / Moderator


Jun 21, 2012, 11:38 AM

Post #14 of 19 (614 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

You shouldn't need rotors unless they are already warped or glazed. Ceramic are considered high quality but I don't think they do that well towing. Beware of those $30, so called ceramics. They are a hybrid and do not do well at all on trucks. A good, name brand semi-metallic would probably work best like Wagner "Quiet stops".




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jun 21, 2012, 11:39 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator


Jun 21, 2012, 11:46 AM

Post #15 of 19 (601 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

I have ceramic by Centric and are expensive at cost. Did tow some insane weight (brothersMad) both nuts loading both my truck and a huge snow mobile trailer way overloaded with green fresh cut oak but was going so slow everywhere didn't tax the breaks so OK. Vehicle and hitch rated for 5,000 lbs by factory. Still wasn't pleased to do that but as said so careful and slow just avoided any real braking need,

T
_________________________________________
Long retired now


jbassking
Novice

Jun 28, 2012, 1:17 PM

Post #16 of 19 (458 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

Here's an update - I did not end up changing the brakes again last week. I took the boat out again and the brakes seemed fine.
Next day I drove from CT to Chicago and back on Sunday. No problems.

Tuesday - I backed out of the driveway and the pedal was pulsing. Most of that day the brakes seemed pretty bad. I can slow to a stop by stepping on the brakes hard didn't really make a difference. By evening and ever since the brakes have been fine. If I step hard the truck stops hard.

So I think I have to rule out the pads and rotors (I'm going to change the brakes next month some time)


Hammer Time
Ultimate Carjunky / Moderator


Jun 28, 2012, 4:34 PM

Post #17 of 19 (447 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

The pulsing may be the ABS kicking in from an inaccurate speed sensor at one of the wheels.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jbassking
Novice

Jun 28, 2012, 5:12 PM

Post #18 of 19 (442 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

What do they look like and is there a way to test them?


Hammer Time
Ultimate Carjunky / Moderator


Jun 28, 2012, 5:56 PM

Post #19 of 19 (438 views)
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Re: Not full brakes on my '07 1500 Suburban [In reply to] Sign In

You need an professional ABS scan tool to do that.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jun 28, 2012, 5:56 PM)




Not full brakes on my '07 1500 Suburban


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