1994 LeSabre Brake Booster Check Valve - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 06-27-2011, 06:23 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Aug 2010
Posts: 16
Thanks: 0
Thanked 0 Times in 0 Posts
indplsin72 is on a distinguished road
Default 1994 LeSabre Brake Booster Check Valve

Hi,

My Buick LeSabre Custom has 101,000 miles. I've posted about the rough idle and stalling in other posts.

In reading other posts online it is mentioned the brake booster check valve and gasket can also cause a vacuum leak.

When I push the brake pedal with the car running I notice a change in idle. It also seems that the majority of times it stalls is during or right after pressing the brake pedal. Could a leak in the brake booster check valve gasket cause this? The check valve seems to move pretty easily and the gasket looks worn.

The car has a constant rough idle. During hot weather the car will stall after idling for a few minutes. It doesn't do it constantly and it is only during hot weather after the car is fully warm and idling.

The plugs, wires, ignition module, coils, ECM, etc., have been replaced numerous times. The intake manifold was replaced along with the gaskets. The crankshaft and cam shaft sensors were replaced, the alternator, etc. The sensors check out OK.

Thank you.
indplsin72 is offline   Reply With Quote
Old 06-27-2011, 06:36 PM   #2
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

After you shut the engine off, wait a minute and then remove the check valve from the booster. If you still have a strong vacuum there, there is no leak.
Danthurs is offline   Reply With Quote
Old 06-28-2011, 08:30 PM   #3
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Aug 2010
Posts: 16
Thanks: 0
Thanked 0 Times in 0 Posts
indplsin72 is on a distinguished road
Default

Thank you.
indplsin72 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Brake Booster? raptor660 Performance, Brainstorming & Tuning 2 02-28-2011 01:53 AM
62 bobbe power brake booster Skidooguy68 Classics (Star Chief and 1957 to 1986) 5 10-02-2009 09:54 PM
Master Cylinder/Brake Booster Question jams04 1992-1999 3 01-07-2007 01:38 PM
Check Brake Lights is on but my brake lights are fine. Vaughan221 Everything Electrical & Electronic 16 06-21-2006 11:04 AM
Brake booster issue? rmmartel 1992-1999 1 02-17-2004 02:31 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:59 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.