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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.

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Old 04-27-2010, 01:38 AM   #1
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Default Another Brake light issue

Hey guys (gals), I've read through all the posts concerning the brake indicator illuminating along with the chime, but I haven't found a similar situation as to what I'm encountering.......

This is on a 1999 Series II * --> the brakes were grinding so upon inspection I noticed the passenger'* side, outboard rotor surface had a very deep groove. The driver'* side was quite smooth w/ plenty of pad left. Assuming there was a piston issue on one of the two sides, I opted to replace both rotors, calipers, and pads. I never let the master cylinder reservoir empty as I was changing out the calipers, and I let quite a bit of fluid flow from the bleed valves of the new calipers. After topping off the reservoir, I started the car and noticed the red brake light on and the chime started to ring. I had adjusted the rear brakes as well, so I unplugged the reservoir sensor to make sure it wasn't an actual e-brake issue (too tight or e-brake pedal problem). Disconnecting the fluid level sensor for sure silences the alarm. I pulled the sensor out from under the reservoir as well, and even plugged in and removed, the light is off too, so it'* definitely as if the reservoir float (or whatever is inside the reservoir) is not activating the sensor.

Is there a way to dismantle the whole of the reservoir for cleaning and checking the inside sensor assembly, or is this an indicator of something different? Again, I allowed quite a bit of fluid to escape from both bleed valves, so I think they may be sufficiently bled, unless it is necessary to apply the brakes while bleeding, then holding the pedal while tightening the valve for a few pedal cycles......

Thanks for any input.
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Old 04-27-2010, 08:10 AM   #2
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The res is held to the master cylinder by a pin or two and pulls off. To my knowledge there isn't any further that we can go in dismantling. I do believe the sensor is removable, but have not tried as brake juice would spill everywhere.
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Old 04-27-2010, 05:57 PM   #3
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Document ID# 232478
1999 Pontiac Bonneville

Brake Warning Indicator Always On

<A href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=232478&pubid=105&evc=sm&cellId =50227#tab1-232478">ind always on

Step
Action
Value(*)
Yes
No
1
Was the entire Brake Warning System Check performed?
--
Go to step 2
Go to Brake Warning System Check
2
  1. <LI type=1>Disconnect the brake fluid level switch.
  2. Connect a test lamp between the brake fluid level switch harness connector terminal B and battery positive voltage.
Is the test lamp lit?
--
Go to step 3
Go to step 6
3
  1. <LI type=1>Disconnect the park brake switch. <LI type=1>Disconnect the test lamp.
  2. Connect a test lamp between the park brake switch harness connector terminal A and battery positive voltage.
Is the test lamp lit?
--
Go to step 4
Go to step 7
4
  1. <LI type=1>Disconnect the body control module. <LI type=1>Disconnect the test lamp.
  2. Connect a test lamp between the body control module harness connector C2, terminal D3 and battery positive voltage.
Is the test lamp lit?
--
Go to step 5
Go to step 8
5
Repair a short to ground in circuit 33 (TAN/WHT).
Is the repair complete?
--
Go to Brake Warning System Check
--
6
Replace the brake fluid level switch.
Is the repair complete?
--
Go to Brake Warning System Check
--
7
Replace the park brake switch.
Is the repair complete?
--
Go to Brake Warning System Check
--
8
  1. <LI type=1>Perform the Body Control Module System Check in Body Control Systems.
  2. If no problems were found, replace the Body Control Module Replacement .
Is the repair complete?
--
Go to Brake Warning System Check
--
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Old 04-28-2010, 12:18 AM   #4
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did you make sure park break is released completely?
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Old 05-03-2010, 05:52 PM   #5
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Default

Thanks for your replies, and sorry for the long delay in responding back........

Yeah, I did check the e-brake lever several times by depressing and releasing it as well as physically pulling up on it to ensure it was released. I will perform the tests that were suggested for the fluid sensor and e-brake switch......

thanks again!
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