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#1
12-12-2010, 10:51 PM
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Very brief buzz when brake pedal is depressed
1995 E320 Here's one I've never experienced before...
I just noticed that when I depress the brake pedal (I'm talking within the first centimeter of the pedal being depressed) I hear a very brief buzz that lasts a half-second, then disappears. I reapply the brake pedal, it does it again. I think the buzz is coming from behind the instrument cluster (?) The sound is so fleeting, it's hard to tell. What is this? 
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#2
12-12-2010, 11:36 PM
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I found that on my car if I open the door with the car running and press the brake the warning buzzer will sound very very briefly. Does the buzz sound like the warning buzzer?
-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#3
12-13-2010, 07:06 AM
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Anti-lock cutting in?
Jim
__________________
14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#4
12-13-2010, 08:21 AM
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In fact I did have the driver's door open when this was happening. It could be the same tone/buzz as the when leaving the key in the ignition...
Just prior to this, my ABS/ASR light came on and the ABS was not working. For codes, I got the usual #1 no fault found. I erased the code. While doing all of this, that was when I noticed this brief buzz. It's been raining up here for the past two-days.
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#5
12-13-2010, 08:24 AM
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Normal for that to happen with key on & door open.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#6
12-13-2010, 08:26 AM
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Thanks, I don't think I ever noticed that...
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#7
12-13-2010, 10:32 AM
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Just normal behavior with SBC braking. That electric pump keeps things "ready" for sure.
__________________
Kent Christensen Albuquerque '07 GL320CDI, '10 CL550. '01 Porsche Boxster Two BMW motorcycles
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#8
12-13-2010, 11:10 AM
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Quote:
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