The Possessed Brake Pedal - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-13-2004, 02:55 AM   #1
Senior Member
True Car Nut
Thread Starter
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default The Possessed Brake Pedal

One day i started up my bonnie, and proceeded to place my foot on the brake pedal so that i safely may remove it from park, when i noticed the pedal would only travel about half an inch or so, before running into what feels like the mechanism that the abs uses to "overide" the brakes and pulse and stuff. after holding against that stop for a second, i felt it slowly allowing the pedal to proceed to the floor. i thought it was a fluke. it happend again the next time i tried to use the brakes. each time i hit the brake pedal, the brake light comes on, and then shortly after, the abs light comes on, until i let off of the pedal, where they go out in the same order. i have kinda gotten used to it because i am stupidly poor right now, but after almost frying up the rear end of a rice burner, i decided to look into it. i tried to run the code scan on it <mine does engine and abs>, but was unable to get any codes at all, not even a diagnostic code. the car behavior remained exactly the same also, unlike the engine diagnostics, almost like the codescanner wasnt plugged in. please help. brake fluid fine. pads fine all around. no appearant leaks.
rjolly87 is offline   Reply With Quote
Old 10-13-2004, 07:38 AM   #2
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

I know exactly what you've got. First of all.. the BRAKE light is comming on because the brake pressure is under 1200kPa or something like that, and the ABS light comes on with it.. just because it feels it wants to protrude its ugly head in there. The ABS light will NOT give you codes for the lack of pressure. Here'* what could be happening. There could be low fluid, a leak [hence the low fluid], or your accumulator is dead or dying. Pop the hood, and turn the ignition on, you will hear the pump priming, how long does it take for the pump to shut off? If less than 60 seconds.. the pump is ok. Now, turn the ignition off, and press the brake pedal 25 times.. untill it is rock hard.. then 5 more times, because 30 is an even number. Now, go check the fluid level in the Master Cylinder Resevoir. Where is it? If low, refill it to the line that says full, with the two arrows, but DON'T overfill it.. just like the pretty little black sticker says .


-justin
opensourceguy is offline   Reply With Quote
Old 10-13-2004, 03:11 PM   #3
Senior Member
True Car Nut
Thread Starter
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

yeah, its less then 60 seconds, but every now and then, if i leave the ignition on for a while without starting the car, i can hear it reprime for about a second. i cant pump the brakes because that stop, when the car is off, is right there at the top, and will not let the pedal travel down.
rjolly87 is offline   Reply With Quote
Old 10-13-2004, 03:43 PM   #4
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

So its full.. the pedal becomes firm When my power brakes go out, I can't get more than 1.5" travel, and that'* with a lot of force. Mine does the same, when I leave the ignition on [for whatever reason] it will come on for 5-20 seconds to re-prime, that is normal.

When the ignition is off.. you can't press the brake pedal whatsoever?


-justin
opensourceguy is offline   Reply With Quote
Old 10-13-2004, 04:45 PM   #5
Senior Member
True Car Nut
Thread Starter
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

right. the abs override being at the top stops most all pedal movement. its not the lack of power assist brakes, i know that for a fact.
rjolly87 is offline   Reply With Quote
Old 10-13-2004, 05:20 PM   #6
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

Never heard of any ABS override.. I guess, I don't know, you've got me on this one.


-justin
opensourceguy is offline   Reply With Quote
Old 10-13-2004, 06:01 PM   #7
Senior Member
True Car Nut
Thread Starter
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

you know how the abs picks up the brake pedal if the wheels start locking up? its doing that, but all the time, with no pulse. its like stepping on a rock with no give until it decides to give me some, which is none with the ignition off.
rjolly87 is offline   Reply With Quote
Old 10-13-2004, 06:14 PM   #8
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

the ABS doesn't do that. The ABS pulses the pedal.. it does kinda push the pedal against you a little when doing this, but nothing major. This is an electronically controlled operation, there is no way this would happen with the ignition off.


-justin
opensourceguy is offline   Reply With Quote
Old 10-13-2004, 06:17 PM   #9
Senior Member
True Car Nut
Thread Starter
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

right, but the mechanism that pushes back is whats causing the problem. that is why i am unable to fully utilize my brakes right away.
rjolly87 is offline   Reply With Quote
Old 10-13-2004, 06:23 PM   #10
Senior Member
True Car Nut
 
Join Date: Feb 2004
Location: Western MA
Posts: 2,708
Thanks: 0
Thanked 1 Time in 1 Post
randman1 is on a distinguished road
Default

If you have a rock hard pedal, you have no pressure in the system. The pump and it'* associated parts (relays, fuses, etc) could be blamed. I'm not sure if a faulty accumulator can also cause this but it is a part that needs to be replaced. It has a lifespan of 10 years or so.
randman1 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Brake pedal to the floor - no brake pressure milty 1992-1999 7 05-12-2008 10:13 AM
Brake pressure problem. Brake pedal travels to floor chilump 1992-1999 9 11-02-2006 11:37 AM
Brake Pedal locked -- Car will not start osx 1992-1999 1 08-01-2004 02:08 PM
Gas pedal, brake pedal position younghelio 1992-1999 1 03-19-2004 12:10 AM
Parking Brake pedal... BonneMeMN General GM Chat 22 01-03-2004 02:54 AM


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 03:48 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.