Anyone having problems with the Hydraboost?

Bgdsub72 · May 9, 2005

On two seperate ocassions today I was parking my truck and when I hit the brakes the pedal nearly dropped to the floor before stopping. I pumped them again and they stopped fine. That scares me, what if that happens in a hairly situation where I need them to be working 100%? Has anyone else had a similar situation? I am about ready to take it into the dealer. Any suggestions on what it could be?

jamashke · May 9, 2005

I have seen this issue on the Fed's site. I think there are some recalls for the hydraboost.

Scyry · May 9, 2005

I get that every now and then. The dealer chalked it up to the system being worked hard by turning my oversized tires (265/75/R16) and braking at the same time. Couple times it caused me to get close to hitting a car; wouldn't turn fast or brake. I just figure it is the same old "working as intended" crap I get on everything I complain about.

GM-Tech · May 9, 2005

I have seen this issue on the Fed's site. I think there are some recalls for the hydraboost.

There are a couple different recalls on hydroboost; however, nothing that causes the described issue. The problem would more likely be a master cylinder problem or a bad wheel speed sensor causing the abs to kick in, which often has the customer describing it as the pedal falling.

jamashke · May 9, 2005

Isn't there a recall for the ABS sensors in the "salt" band states? I heard something in the news about it.

Bgdsub72 · May 10, 2005

Well, it happened another 5-6 times over the course of the day and evening. Usually when pulling into parking spots, but one time today when I was trying to slow down to make a left turn. I am going to have it towed into the dealership tomorrow morning.

I had a few close calls tonight with stopping the truck before hitting something and I dont feel that driving around a 9000 lb truck with brakes that work every now and then is too safe. If I were to get in an accident due to the truck not stopping there could be some major damage up to and including fatalaties. It is not a good feeling when you have a 9000 lb truck that will not stop.

I already called the dealer and they will have a rental truck ready for me in the morning while the diagnose the problem. I do have 35" tires, would it be a good idea to put the stock wheels and tires back on before I take it in? Or should I just leave it as is? I have a feeling that they will not warranty the problem due to the oversized tires.

2001 HD · May 10, 2005

Save yourself a trip for nothing and throw the stock wheels back on. I'm guessing they won't touch it with oversize wheels on it. There is a TSB about this regarding the D/A combo.

Bgdsub72 · May 10, 2005

Save yourself a trip for nothing and throw the stock wheels back on. I'm guessing they won't touch it with oversize wheels on it. There is a TSB about this regarding the D/A combo.

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Is the TSB about the hydraboost on the D/A? I dropped the truck off to the dealer (where I bought the truck) this morning with the oversized tires so I am just waiting to see what they say. If they tell me it is the tires I will take it to another dealer with the stock tires. They gave me a rental Colorado crew cab for the day (they were out of silverados, and they would not spring the extra $$$ to let me get the SSR) I should find out later today what is going on with the truck, and while it is in there I have them checking out the steering shaft and the pass. side power window which is making a noise.

Bgdsub72 · May 11, 2005

Well, the dealer said it was the ABS sensor that was prematurly causing the front ABS to kick in, but not the rear. They also said that my front calipers are hitting the upper control arms??? Which is when this happens. I am going to pick up the truck tomorrow and check it out. I just got an alignment done a day prior to this happening so maybe they messed with something.