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markcm2
Samba Member
Joined: September 02, 2015
Posts: 505
Location: Bellingham, Washington
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 Posted: Sun Mar 25, 2018 7:54 pm Post subject: What is the wheezing vacuum leak sound from brake pedal switch? |
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I’m on a road trip and when coasting down hill, foot off the accelerator, we occasionally hear a whistle wheezing sound from the switch on the brake pedal. It will last a few seconds and/or it stops if I depress the accelerator.
What is this switch and any idea why it whistles when coasting down hill? |
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JMB3
Samba Member
Joined: July 19, 2015
Posts: 85
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| Posted: Sun Mar 25, 2018 11:10 pm Post subject: Re: What is the wheezing vacuum leak sound from brake pedal switch? |
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| markcm2 wrote: |
I’m on a road trip and when coasting down hill, foot off the accelerator, we occasionally hear a whistle wheezing sound from the switch on the brake pedal. It will last a few seconds and/or it stops if I depress the accelerator.
What is this switch and any idea why it whistles when coasting down hill? |
There are two switches on the brake pedal. One cancels the cruise control. It is a dual function switch. It breaks an electrical connection, so it has wires coming into it, and it opens a vacuum to the atmosphere, so it has a vacuum line attached. http://vweurovan.wikia.com/wiki/Cruise_Control_Brake_Switch |
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markcm2
Samba Member
Joined: September 02, 2015
Posts: 505
Location: Bellingham, Washington
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| Posted: Mon Mar 26, 2018 6:51 am Post subject: Re: What is the wheezing vacuum leak sound from brake pedal switch? |
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| Thank you for the info! |
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Zeitgeist 13
Samba Member
Joined: March 05, 2009
Posts: 12161
Location: Port Manteau
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| Posted: Mon Mar 26, 2018 10:25 am Post subject: Re: What is the wheezing vacuum leak sound from brake pedal switch? |
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The vacuum switch was my first thought, but then I remembered that this is a drive by wire engine, so there isn't any vacuum actuator used. Does it still use the vacuum switch?
_________________
Casey--
'89 Bluestar ALH w/12mm Waldo pump, PP764 and GT2052
'01 Weekender --> full camper
y u rune klassik? |
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Marshall277
Samba Member
Joined: December 13, 2023
Posts: 4
Location: Oregon
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| Posted: Wed Dec 13, 2023 10:07 pm Post subject: Re: What is the wheezing vacuum leak sound from brake pedal switch? |
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Hi - has anyone resolved this?
I recently purchased a one-owner, 2002 Eurovan MV Westfalia that's in great condition. A few days ago it started making this high pitch noise, and I'm wondering if anyone here found a resolution.
Thanks! |
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TheOneTrueQuux
Samba Member
Joined: May 26, 2021
Posts: 452
Location: Winona, MN
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| Posted: Thu Dec 14, 2023 8:17 am Post subject: Re: What is the wheezing vacuum leak sound from brake pedal switch? |
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| Marshall277 wrote: |
Hi - has anyone resolved this?
I recently purchased a one-owner, 2002 Eurovan MV Westfalia that's in great condition. A few days ago it started making this high pitch noise, and I'm wondering if anyone here found a resolution.
Thanks! |
It is likely a leaky brake booster. |
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Marshall277
Samba Member
Joined: December 13, 2023
Posts: 4
Location: Oregon
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| Posted: Thu Dec 14, 2023 10:48 am Post subject: Re: What is the wheezing vacuum leak sound from brake pedal switch? |
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| TheOneTrueQuux wrote: |
| Marshall277 wrote: |
Hi - has anyone resolved this?
I recently purchased a one-owner, 2002 Eurovan MV Westfalia that's in great condition. A few days ago it started making this high pitch noise, and I'm wondering if anyone here found a resolution.
Thanks! |
It is likely a leaky brake booster. |
Nice - do I need to replace the booster or can I spray something on it or replace a seal or repair it in any way? Thank you! |
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TheOneTrueQuux
Samba Member
Joined: May 26, 2021
Posts: 452
Location: Winona, MN
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| Posted: Thu Dec 14, 2023 4:02 pm Post subject: Re: What is the wheezing vacuum leak sound from brake pedal switch? |
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| Marshall277 wrote: |
| TheOneTrueQuux wrote: |
| Marshall277 wrote: |
Hi - has anyone resolved this?
I recently purchased a one-owner, 2002 Eurovan MV Westfalia that's in great condition. A few days ago it started making this high pitch noise, and I'm wondering if anyone here found a resolution.
Thanks! |
It is likely a leaky brake booster. |
Nice - do I need to replace the booster or can I spray something on it or replace a seal or repair it in any way? Thank you! |
First confirm the diagnosis by disconnecting and plugging the vacuum line to the booster. If the noise goes away, you've found it.
The usual failure is that the diaphraghm inside gets a tear in it, replacement is usually the only option. |
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Marshall277
Samba Member
Joined: December 13, 2023
Posts: 4
Location: Oregon
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| Posted: Thu Dec 14, 2023 4:11 pm Post subject: Re: What is the wheezing vacuum leak sound from brake pedal switch? |
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| TheOneTrueQuux wrote: |
| Marshall277 wrote: |
| TheOneTrueQuux wrote: |
| Marshall277 wrote: |
Hi - has anyone resolved this?
I recently purchased a one-owner, 2002 Eurovan MV Westfalia that's in great condition. A few days ago it started making this high pitch noise, and I'm wondering if anyone here found a resolution.
Thanks! |
It is likely a leaky brake booster. |
Nice - do I need to replace the booster or can I spray something on it or replace a seal or repair it in any way? Thank you! |
First confirm the diagnosis by disconnecting and plugging the vacuum line to the booster. If the noise goes away, you've found it.
The usual failure is that the diaphraghm inside gets a tear in it, replacement is usually the only option. |
This is very helpful. Thank you so much! |
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