1st start hi-idle, no power brakes. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

'10CamaroDude · 04-06-2020, 06:33 PM

2010, V6, Auto.

When I first start the car, and you get that 10-13 second or so hi-idle, the
power brakes do not work. I started it up, and while it was hi-idling, came
down off ramps (or rack), I have no power brakes. I can step into the
pedal and it stops. It only happens during the initial cold hi-idle. As soon
as the hi-idle drops, the brakes work. Once once it's warmed up when
restarting, brakes are fine. Does not happen when driving at higher RPMs.
It only happens when starting cold. The car does have a vacuum boost
pump.

Pump to brake booster line was replaced, and it didn't do this till that was
done. It was broken before, and the brakes were fine all the time.

Mouse330 · 05-01-2020, 04:35 PM

To make sure there's an adequate supply of vacuum the vacuum pump is used during cold start-up, heavy throttle, and high altitude conditions. I'd suspect the pump is no good

HOJO · 05-01-2020, 05:59 PM

Definitely a vacuum issue.

'10CamaroDude · 05-01-2020, 08:44 PM

The odd thing is, when the vacuum pump hard line was broken, this didn't
happen. I slid a section of hose over the broken section of the hose, and
this didn't happen. When the line was replaced, then it started, and only
at the initial high idle.

I know it's a vacuum issue, but seems coincidental that the pump just happened
to fail right after that line repair.

I got a P0023 code to chase down, with new VVTs, while an old one doesn't
set the code. So, I have that to worry about, unless I want to put one of the
old VVTs back in. This car is a nightmare... I should have cut my losses and
let them buy it back...

04-06-2020, 06:33 PM	#1
'10CamaroDude Account Suspended Drives: 2010 Camaro LS Join Date: Nov 2019 Location: Pgh Posts: 739 View My Garage	1st start hi-idle, no power brakes. 2010, V6, Auto. When I first start the car, and you get that 10-13 second or so hi-idle, the power brakes do not work. I started it up, and while it was hi-idling, came down off ramps (or rack), I have no power brakes. I can step into the pedal and it stops. It only happens during the initial cold hi-idle. As soon as the hi-idle drops, the brakes work. Once once it's warmed up when restarting, brakes are fine. Does not happen when driving at higher RPMs. It only happens when starting cold. The car does have a vacuum boost pump. Pump to brake booster line was replaced, and it didn't do this till that was done. It was broken before, and the brakes were fine all the time. Last edited by '10CamaroDude; 04-13-2020 at 03:14 AM.

05-01-2020, 04:35 PM	#2
Mouse330 Drives: 2011 2SS, 2006 GMC Sierra Join Date: Jul 2019 Location: MA Posts: 247	To make sure there's an adequate supply of vacuum the vacuum pump is used during cold start-up, heavy throttle, and high altitude conditions. I'd suspect the pump is no good

05-01-2020, 05:59 PM	#3
HOJO Drives: 2014 Camaro SS/RS 1LE 1967 Camaro Join Date: Oct 2013 Location: Fort Wayne, IN Posts: 874	Definitely a vacuum issue.

05-01-2020, 08:44 PM	#4
'10CamaroDude Account Suspended Drives: 2010 Camaro LS Join Date: Nov 2019 Location: Pgh Posts: 739 View My Garage	The odd thing is, when the vacuum pump hard line was broken, this didn't happen. I slid a section of hose over the broken section of the hose, and this didn't happen. When the line was replaced, then it started, and only at the initial high idle. I know it's a vacuum issue, but seems coincidental that the pump just happened to fail right after that line repair. I got a P0023 code to chase down, with new VVTs, while an old one doesn't set the code. So, I have that to worry about, unless I want to put one of the old VVTs back in. This car is a nightmare... I should have cut my losses and let them buy it back...