Sudden, temporary hissing noise
#1
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I recently bought a 1999 Blazer. I've had the following work done: new radiator hoses, replaced one idler arm, new Bilstein shocks, new rear brakes and rotors, new intake gasket. It's running and riding pretty good.
A couple days ago, I was driving up my friends driveway with the windows down, and suddenly there was a loud hissing noise. I thought I had punctured my tire, or that my shock had busted (but I thought, shocks don't have air). It sounded kind of like the sound that comes from an air compressor when you pull the release valve. The sound lasted about 10-15 seconds and stopped.
At the exact same time, there was a loud scraping coming from the rear brake. The brake scraping continued as I drove on up to my friends house. I thought something on the brake had broken loose. Anyway, when I left, the scraping from the brake lasted about halfway down the driveway and then stopped. I haven't heard either sound since.
Any ideas? The Blazer seems to be running fine. Everything seems to be working.
Thanks in advance for any input.
A couple days ago, I was driving up my friends driveway with the windows down, and suddenly there was a loud hissing noise. I thought I had punctured my tire, or that my shock had busted (but I thought, shocks don't have air). It sounded kind of like the sound that comes from an air compressor when you pull the release valve. The sound lasted about 10-15 seconds and stopped.
At the exact same time, there was a loud scraping coming from the rear brake. The brake scraping continued as I drove on up to my friends house. I thought something on the brake had broken loose. Anyway, when I left, the scraping from the brake lasted about halfway down the driveway and then stopped. I haven't heard either sound since.
Any ideas? The Blazer seems to be running fine. Everything seems to be working.
Thanks in advance for any input.
#3
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I took a good look at the shocks after work today, specifically the front passenger shock. I don't see anything noticeable or out of the ordinary, no leaking oil, no cracks, or fractures. The shock seems normal. So, I really have no idea what the hissing was.
#4
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Well the only things that comes to mind that would make the noise you described would be either a shock loosing charge or maybe the AC unit with a sudden leak.
The rear brake growling at the same time could be just luck but almost leads me to a rear gas charged shock popping a pin hole and blowing nitrogen and maybe temp. freezing up a brake or line. but if the sound lasted 10 to 15 seconds a shock prob wouldn't have lasted that long.
The rear brake growling at the same time could be just luck but almost leads me to a rear gas charged shock popping a pin hole and blowing nitrogen and maybe temp. freezing up a brake or line. but if the sound lasted 10 to 15 seconds a shock prob wouldn't have lasted that long.
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#6
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Well you could pull the shocks loose and see if they extend on their own. But they can be sometimes be a royal PIA to get collapsed back into position.
Over the years I have had new heavy duty charged shocks delivered to the shop that have had the nylon straps either broken or dislodged and to install them I have had too install the top mount and use a floor jack under them to collapse them up enough to install the bottom mount
Over the years I have had new heavy duty charged shocks delivered to the shop that have had the nylon straps either broken or dislodged and to install them I have had too install the top mount and use a floor jack under them to collapse them up enough to install the bottom mount
#7
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Rusted dust sheild hitting rotor?
Dorman - OE Solutions Brake Dust Shield Pair 924-222: Advance Auto Parts
Dorman - OE Solutions Brake Dust Shield Pair 924-222: Advance Auto Parts
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