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.

Lost power brakes after slamming on brakes

Thread Tools
 
Search this Thread
 
Old 11-02-2007, 11:13 PM
  #1  
Senior Member
Posts like a Supercharger
Thread Starter
 
maxpower9004's Avatar
 
Join Date: Apr 2004
Location: Providence, RI
Posts: 171
Likes: 0
Received 0 Likes on 0 Posts
maxpower9004 is on a distinguished road
Default Lost power brakes after slamming on brakes

The other day I was in a situation that required me to slam on my brakes from going about 40mph. After that my brake light came on (as if I hit the E brake) and it seems as though I have lost my power braking. I am still able to stop the car, it just takes more pressure and "throw" on the pedal than normally. I haven't checked the fluid yet, but I was wondering if anyone had any suggestions on what to look for. Thanks.
Old 11-02-2007, 11:15 PM
  #2  
PopaDopaDo
True Car Nut
 
popatim's Avatar
 
Join Date: Jan 2005
Location: NY
Posts: 4,957
Likes: 0
Received 1 Like on 1 Post
popatim is on a distinguished road
Default

Look for leaks. In the rear you may have to pull the drum to find evidence or you may see the drip down the inside of the tire if you pump the brakes enough while sitting still.
Old 11-02-2007, 11:17 PM
  #3  
Senior Member
True Car Nut
 
bandit's Avatar
 
Join Date: Jan 2006
Location: NEBF:06,07 | NYBF:06,07 | ONBF:06,07 | CNBF:06 & more............
Posts: 8,029
Likes: 0
Received 0 Likes on 0 Posts
bandit is on a distinguished road
Default

check the break lines for a pin whole or leaks. you will see a wet spot.
Next check around the master cylinder for leaks.
if that all falls its either a internal master cylinder problem, or a rear wheel cylinder leaking.
Old 11-03-2007, 12:13 AM
  #4  
Junior Member
 
wjcollier07's Avatar
 
Join Date: Aug 2005
Posts: 0
Likes: 0
Received 0 Likes on 0 Posts
wjcollier07 is on a distinguished road
Default

I'd check that fluid damn quick. If the light came on, you're probably REALLY low, and if you DO have a leak, you won't have brakes soon. And if you pump air into the MC bore, you'll have to remove it and bench bleed it. Hydraulic systems don't work too well with air in them.

Sounds like you blew some seal. Check the insides of all 4 wheels for brake fluid.
Old 11-03-2007, 12:18 AM
  #5  
Senior Member
Certified GM nut
 
samueljackson's Avatar
 
Join Date: Oct 2006
Location: burb of detroit. 2 miles north of 8 mile Rd.
Posts: 2,028
Likes: 0
Received 1 Like on 1 Post
samueljackson is on a distinguished road
Default

if the pedal is hard, thats not a fluid leak.

thats a booster problem. fluid leak would cause the pedal to go to the floor, easier.

maybe check the vac line from the uim to the power booster
Old 11-03-2007, 12:27 AM
  #6  
Junior Member
 
wjcollier07's Avatar
 
Join Date: Aug 2005
Posts: 0
Likes: 0
Received 0 Likes on 0 Posts
wjcollier07 is on a distinguished road
Default

yeah, but that wouldn't cause the brake warning light to turn on
Old 11-03-2007, 12:29 AM
  #7  
Senior Member
Posts like a Supercharger
Thread Starter
 
maxpower9004's Avatar
 
Join Date: Apr 2004
Location: Providence, RI
Posts: 171
Likes: 0
Received 0 Likes on 0 Posts
maxpower9004 is on a distinguished road
Default

The stopping power of the car hasn't changed since it did when it first happened, if that means anything. Thank you for all the help thus far.
Old 11-03-2007, 12:37 AM
  #8  
PopaDopaDo
True Car Nut
 
popatim's Avatar
 
Join Date: Jan 2005
Location: NY
Posts: 4,957
Likes: 0
Received 1 Like on 1 Post
popatim is on a distinguished road
Default

Whatr did you mean by "more throw on the pedal"? I assumed you meant it is traveling farther than normal; an indication of a leak.
Old 11-03-2007, 12:38 AM
  #9  
Senior Member
Certified GM nut
 
samueljackson's Avatar
 
Join Date: Oct 2006
Location: burb of detroit. 2 miles north of 8 mile Rd.
Posts: 2,028
Likes: 0
Received 1 Like on 1 Post
samueljackson is on a distinguished road
Default

Originally Posted by popatim
Whatr did you mean by "more throw on the pedal"? I assumed you meant it is traveling farther than normal; an indication of a leak.
yes, please clarify. bc i interpreted it as more force to get the pedal down.
Old 11-09-2007, 12:54 PM
  #10  
Senior Member
Posts like a Supercharger
Thread Starter
 
maxpower9004's Avatar
 
Join Date: Apr 2004
Location: Providence, RI
Posts: 171
Likes: 0
Received 0 Likes on 0 Posts
maxpower9004 is on a distinguished road
Default

popatim wrote:
Whatr did you mean by "more throw on the pedal"? I assumed you meant it is traveling farther than normal; an indication of a leak.


yes, please clarify. bc i interpreted it as more force to get the pedal down.
Sorry for the confusion. The pedal travels further. Now it actually travels to the floor, and it is harder to stop the car than before. I didn't notice any fluid leaks, and upon first try I was unable to get the cap off the fluid reservoir. I will try again today.


Quick Reply: Lost power brakes after slamming on brakes



All times are GMT -4. The time now is 05:52 AM.