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Almost certainly a leak at the servo. When you apply brakes, a small slave
cylinder in the servo moves a valve which gates atmospheric pressure into the
outer part of the large air/vacuum piston (vacuum is held on both sides when
brakes are not being applied). If this valve is not sealing completely it could
allow atmospheric pressure air into the manifold (there is a check valve on the
servo to prevent this and hold some vacuum in the event of engine failure at
speed, but it could leak, too).
Now that you've done the carbs, it's on to the servo! ;)
Bob
----- Original Message -----
From: "George Vernau Sr" <gvernau@gmail.com>
To: "Healey list" <healeys@autox.team.net>
Sent: Wednesday, June 3, 2015 1:56:17 PM
Subject: [Healeys] rebuilt HD8s
I recently rebuilt the HD8 carbs on my 1967 BJ8 and the car runs great again
(although the price of carb kits is just crazy these days). However, I notice a
slight increase in idle speed whenever I put my foot on the brake, like when
sitting at a light. I can't ever remember noticing this before, is there a
vacuum leak or is the booster not working properly? Any ideas?
Thanks for any input,
George Vernau
Houston TX
_______________________________________________
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div aria-label=3D"Compose body">Almost certainly a leak at the servo.&=
nbsp; When you apply brakes, a small slave cylinder in the servo moves a va=
lve which gates atmospheric pressure into the outer part of the large air/v=
acuum piston (vacuum is held on both sides when brakes are not being applie=
d). If this valve is not sealing completely it could allow atmospheri=
c pressure air into the manifold (there is a check valve on the servo to pr=
event this and hold some vacuum in the event of engine failure at speed, bu=
t it could leak, too).<br></div><div aria-label=3D"Compose body"><br></div>=
<div aria-label=3D"Compose body">Now that you've done the carbs, it's on to=
the servo! ;)<br></div><div aria-label=3D"Compose body"><br></=
div><div aria-label=3D"Compose body">Bob<br></div><div><br></div><hr id=3D"=
zwchr"><div style=3D"color:#000;font-weight:normal;font-style:normal;text-d=
ecoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data=
-mce-style=3D"color: #000; font-weight: normal; font-style: normal; text-de=
coration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;">=
<b>From: </b>"George Vernau Sr" <gvernau@gmail.com><br><b>To: </b>"He=
aley list" <healeys@autox.team.net><br><b>Sent: </b>Wednesday, June 3=
, 2015 1:56:17 PM<br><b>Subject: </b>[Healeys] rebuilt HD8s<br><div><br></d=
iv><div dir=3D"ltr">I recently rebuilt the HD8 carbs on my 1967 BJ8 and the=
car runs great again (although the price of carb kits is just crazy these =
days). However, I notice a slight increase in idle speed whenever I put my =
foot on the brake, like when sitting at a light. I can't ever remembe=
r noticing this before, is there a vacuum leak or is the booster not workin=
g properly? Any ideas?<div>Thanks for any input,</div><div>George Ver=
nau</div><div>Houston TX</div></div><br>___________________________________=
____________<br><br><div><br></div></div><div><br></div></div></body></html=
>
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_______________________________________________
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