Funky squelch on cold engine starts

Joined
Jan 29, 2016
Messages
34
Location
Lake Forest, Ca

2000 LC 293,xxx miles, on cold start ups there is a squelch that sounds like it's coming from driver side behind the firewall, very distinct inside the cabin, hard to locate in the engine bay over the engine noise. Some times it'll last about 30 seconds. Other times it'll go for a bout a mile down the road before the sound stops. Sounds hydraulic, just replaced the serpentine belt about 5k miles ago, doesn't sound like a belt squeak, slight vibration in the brake pedal when the noise is present. No abs light, no engine light, no soft brakes or failure (brake pedal feels normal). Brake fluid is still clean, power steering was just flushed last week (thought that may have been the culprit). Replaced the A/C condenser 3 months ago and had to drain/recharge the system, working good and still cold. Sound is not RPM based.

My trusted mechanic could not duplicate the sound. Talked with one of the local dealerships techs and he said he wasn't sure what it could be.

I'm leaning towards a Brake issue, but not sure where to start, and wanted to rule out it possibly the transmission (doubt it is, but not 100%)

So I guess I should just ask, any ideas?

 
Joined
Jan 29, 2016
Messages
34
Location
Lake Forest, Ca
Joined
Sep 27, 2007
Messages
1,752
Location
Charlotte NC or ACT area Australia
 
 
Sounds like the noise in the "brake grinding noise" thread from a few days ago, and like a few similar "screeching from m/c area on start up" threads over the years. iirc the problem maybe the silencer tube/o ring that's between the accumulator and pump body and nothing to do with the motor commutator in this case.
 
Joined
Jan 29, 2016
Messages
34
Location
Lake Forest, Ca
Sounds like the noise in the "brake grinding noise" thread from a few days ago, and like a few similar "screeching from m/c area on start up" threads over the years. iirc the problem maybe the silencer tube/o ring that's between the accumulator and pump body and nothing to do with the motor commutator in this case.

Thanks I'll read up on those
 
Joined
Dec 11, 2016
Messages
55
Location
Magnolia Texas
Did you figure anything out yet? I have the same problem with my 00 LC 220k miles. I replaced the booster pump but that didn't make a difference. I now get a high pitched beeping sound as well if I pump the brakes. I also get abs and VSC lights coming on as well.
 
Joined
Jul 23, 2012
Messages
699
Location
❄️☃️
 
Yup, I've had the same noise, I also got ABS, VSC, Brake. It is related to the MC/ABS/accumulator as I'm still trying to track it down and not have to pay $2400 for the whole unit.
 
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