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View Full Version : Brake problem on 2500hd


QuadRacer041
02-12-2010, 09:04 AM
I have an 06 2500hd crew cab. Lately I've noticed that when I hit the brake the pedal it feels spongey right before the truck comes to a stop, real low wheel speed.What could that be? Air getting in the system somehow? I haven't had any service on the brakes done recently, I dont know how it could have started. Any ideas? I talked to a buddy of mine who is a mechanic at a dealership (not chevy though) and said that he thinks it could be an ABS sensor going bad. After he said that it kinda make sense because the action I get from the brake pedal when it happens feels like the abs is kickin in.
Any info would be greatly appreciated.

unkownfl
02-12-2010, 09:38 AM
To me when I feel the ABS kick in it pushes the pedal back towards me so it doesn't feel sponge in my opinion of ABS. Sounds like the master cylinder is allowing fluid to bypass the plunger. With the truck stopped while the engine is running hold the pedal down and see if it continues to go to the floor with steady pressure.

QuadRacer041
02-12-2010, 09:41 AM
ok, maybe spongey isnt the correct word i should have used. The pedal kicks back at me yes....same feeling you get when the abs hits.

Alpha Property
02-12-2010, 10:22 AM
i pulled my ABS fuse.... best thing i could have done, i was having the same kind of problem pulling into parking spots

Alpha Property
02-12-2010, 10:38 AM
the only way to fix this other than just pulling the fuse and scrapping ABS all together is to replace both front wheel barrings. The problem is the ABS sensor is inside of the hub/barring assembly and as they start to wear, not get worn out, just wear, the grease starts to come out of the barring pack and gets flung all over the inside of the hub and lands on the sensor for the ABS.... and theres no way to take the sensors out of the hub, you just have to replace the assembly

QuadRacer041
02-12-2010, 11:12 AM
So if I pull the abs fuse it will stock that brake pedal action?

Alpha Property
02-12-2010, 11:18 AM
yea, it will act normal, just no ABS, the only real downside is your ABS light and your parking brake light will come on on the dash.... but they eventualy burn out lol

QuadRacer041
02-12-2010, 11:29 AM
Is there any I can make a paperclip jumper to make the abs light flash to get any codes?

Alpha Property
02-12-2010, 01:12 PM
as far as i know no there isnt, the ABS system is still working as its designed to do, its just the sensor in the hub is covered in grease and isn't taking an accurate reading at low speeds, and low speeds while turning

QuadRacer041
02-12-2010, 01:28 PM
as far as i know no there isnt, the ABS system is still working as its designed to do, its just the sensor in the hub is covered in grease and isn't taking an accurate reading at low speeds, and low speeds while turning

I didn't think grease would affect how the magnits worked? Can it be cleaned?

Alpha Property
02-12-2010, 01:31 PM
i'm 100% sure on a 1500 wheel barring you can't, i'm 95% sure on a 2500/3500 you can't either, its all cast and sealed

unkownfl
02-12-2010, 01:33 PM
I didn't think grease would affect how the magnits worked? Can it be cleaned?

Grease won't but heat will and the grease will hold all the shavings in there. Now I'm not saying this is your issue, but it is the only thing I can think of what the other guy is saying. Personally if it was a ABS issue I think the light would go off especially on such a new vehicle.

mattfromNY
02-12-2010, 01:37 PM
Check with your dealer. I've had ABS sensors "cleaned" on both my '99 1500 and my '04 2500HD. It is/ was a service bulletin, NOT a recall. On my '99, I was able to get new sensors installed b/c the mechanic "accidentally" broke the sensors pulling them off, I wasn't as lucky with the '04 (different dealership, wouldn't 'work with me'). Once I started having problems again, after having this done, I pulled ABS fuses on both trucks. F&*% ABS!!!

mattfromNY
02-12-2010, 01:38 PM
On the above post, I forgot to mention- sensors were cleaned at no cost to me, as it was a service bulletin at the dealerships, they know there is a problem.

zak406
02-13-2010, 02:58 AM
pull the abs fuse and i bet it is fine after that....

ranger350
02-13-2010, 03:55 PM
there is / was a recall for that. I dont believe they use magents either, its a reluctor wheel and proximity sensor

ranger350
02-13-2010, 04:22 PM
http://ww2.justanswer.com/uploads/GMGreatWrench/2009-02-01_013220_abs_kicking_in.pdf