Brakes sucking air from???? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 12-20-2005, 12:57 PM   #1
Junior Member
Thread Starter
 
Join Date: Aug 2005
Location: North of Buffalo, NY *** NEBF '05, '06, '07 *** ***ONBF & NYBF 06; 07*** ***WCBF 06***
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
singscountry1967 is on a distinguished road
Default Brakes sucking air from????

I did a quick search...didn't see exactly what I was looking for...so here'* my story:

on the '93 SSEi...brakes worked fine on the 6 hour drive home from MA/CT. I get in to test drive...pedal goes 3/4wayto the floor before getting any pressure. Checked the brake fluid - full. No signs of leakage. Son couldn't get the bleeders open, and he'* tied up with finals/work ...so we took it to the local garage for their diagnosis.

They are totally perplexed about it. Never seen this happen before....they were able to bleed the brakes - but air is definitely getting into the line somehow, yet the fluid level is correct. How can air get into a line if the system is closed?

Could it be the master cyl not operating properly? Perhaps its sucking air in that way? Besides the MC...what other things should we consider replacing or testing?
singscountry1967 is offline   Reply With Quote
Old 12-20-2005, 01:28 PM   #2
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

The vacuum booster is one area to consider. Anyone know the symptoms of a booster?

How about one of the brake hoses about to burst and maybe each time you press the pedal it expands like a balloon then goes back to normal when you let off?
BillBoost37 is offline   Reply With Quote
Old 12-20-2005, 01:35 PM   #3
Senior Member
Certified Car Nut
 
Join Date: Oct 2003
Posts: 19,756
Thanks: 0
Thanked 0 Times in 0 Posts
1993 SLE is on a distinguished road
Default

ya the rubber brake lines could be getting old and expanding
1993 SLE is offline   Reply With Quote
Old 12-20-2005, 01:53 PM   #4
Senior Member
True Car Nut
 
toastedoats's Avatar
 
Join Date: Sep 2004
Location: Fitchburg Ma _ToastedRice_
Posts: 6,837
Thanks: 0
Thanked 0 Times in 0 Posts
toastedoats is on a distinguished road
Default

i would think that maybe one of the seals is bad in the master cylinder, allowing some fliud to blow by the seals... other than that, the rubber hose collapsing could be the problem aswell, but the mechanic should have seen this while bleeding the brakes
toastedoats is offline   Reply With Quote
Old 12-20-2005, 01:54 PM   #5
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

I would start with the two rubber brake lines on the front calipers for starters, simply because those are items (if they're original) that have a limited lifetime anyway, and are relatively inexpensive.

Are you getting air on BOTH sides? If so, you can generally rule out the calipers and start looking at the MC.
willwren is offline   Reply With Quote
Old 12-20-2005, 02:33 PM   #6
Senior Member
Posts like a Northstar
 
Join Date: Jan 2005
Location: Richfield, MN
Posts: 781
Thanks: 0
Thanked 0 Times in 0 Posts
alec_b is on a distinguished road
Default

Make sure and look around the area where the Master Cylinder meets the Brake Booster. Specifically directly underneath the MC. If you see a trail of shiny brake fluid seeping down the booster you've got a good sign of internal MC seal leakage. I've had several of these come through my shop, they're relatively simple to do. But for sure if you can pull your front wheels, or just turn them, and inspect the rubber hoses for ANY signs of wear/cracking. No big deal to change those either, but you may need heat. I usually do. Doesn't suprise me that you couldn't get the bleeders open either they have to be heated a lot also.
alec_b is offline   Reply With Quote
Old 12-20-2005, 03:22 PM   #7
Junior Member
Thread Starter
 
Join Date: Aug 2005
Location: North of Buffalo, NY *** NEBF '05, '06, '07 *** ***ONBF & NYBF 06; 07*** ***WCBF 06***
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
singscountry1967 is on a distinguished road
Default

I believe the mechanic said "...getting air on one side...." I've got a message out to find out for sure. Will check the hoses and the MC as noted....thanks guys!
singscountry1967 is offline   Reply With Quote
Old 12-28-2005, 09:50 AM   #8
Junior Member
Thread Starter
 
Join Date: Aug 2005
Location: North of Buffalo, NY *** NEBF '05, '06, '07 *** ***ONBF & NYBF 06; 07*** ***WCBF 06***
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
singscountry1967 is on a distinguished road
Default

Update:

It was indeed the Master Cylinder. The driver front and passenger rear were both getting air...evidentially these are operated by the same part within the MC. Put a new one in and she'* ready to run.
singscountry1967 is offline   Reply With Quote
Old 12-28-2005, 11:33 AM   #9
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

Quote:
Originally Posted by singscountry1967
Update:

It was indeed the Master Cylinder. The driver front and passenger rear were both getting air...evidentially these are operated by the same part within the MC. Put a new one in and she'* ready to run.
The master cylinders on the ABS Bonnies are very proned to failure... And the brake system works in halves.... Chances are thet one part will fail leaving you with the other half, just as a fail safe so you don't totally loose the brakes...

I have seen these master cylinders go bad left and right on the H bodies... So nothing new there...

Glad you got it fixed

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 01-02-2006, 08:21 PM   #10
Member
Posts like a V-Tak
 
Join Date: Jul 2004
Location: Minneapolis MN
Posts: 68
Thanks: 0
Thanked 0 Times in 0 Posts
Anything4APontiac is on a distinguished road
Default

As much as I believe in using GM parts, I really hate paying for them more than I need to.
For those of us tired of paying for the failing parts, here'* the number'* from Napa with lifetimre warranties.

Tru Stop TS 102714 Reman, Limited Lifetime warranty
United UP 390267 New, Limited Lifetime warranty

You do have to swap the reservoir, so it'* not just a quick bolt on. I haven't done it yet, but both of my Bonnies have weak MC'*. The 93 is a GM replacement I did 6 years ago.
Anything4APontiac is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Loud air sucking noise from air cleaner box and sensor ??? pontiacandryan 1992-1999 6 07-17-2009 08:26 PM
What's loud sucking sound from air filter box at startup? torero500 2000-2005 10 03-26-2008 02:13 AM
Strange sucking sound coming from air intake area TexasBonnieGuy 1992-1999 1 09-27-2005 03:15 PM
Coolant Slow Leak, Oil Sucking a little 94Regal Lounge 3 02-06-2004 12:51 AM
Brakes Brakes Brakes Terran 2000-2005 11 04-27-2003 11:28 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 02:23 AM.


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.