'91 Olds 98 Master Cylinder Replace - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-31-2007, 10:08 PM   #1
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Default '91 Olds 98 Master Cylinder Replace

Had to replace the Master Cylinder.....could not figure a way to bench bleed as the resevior had a hole on the opposite side for the tubing that ran down to the ABS system...had no way to plug that hole. Put it on the booster....attached the tube.....put plugs in 2 holes on MC with 2 clear tubes. Had my daughter depress the bake until no air bubbles. Bleed the lines at the calibers etc....Now when I start the car, the red "BRAKE" light stays on. The vehicle seems to brake fine, and the pedal feels normal. I've replaced this cylinder about 5 years ago and don't remember this problem. What'* up? Obviously, I fiqure I still have some air in the lines......re-bleed?

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Old 04-01-2007, 04:33 PM   #2
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Re-bled each wheel this PM....still no luck. The brake light remains on.....it was not on before the repair. The brakes work just fine, the fluid level is right....I don't know what else it could be unless the sensor inside the resevoir messed up when I had the resevoir off in the MC replace. Any other ideas?
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Old 04-01-2007, 06:47 PM   #3
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You didn't by any chance partially engage the emergency brake did you. Richard
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Old 04-01-2007, 09:49 PM   #4
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Yeah, check your ebrake. wiggle it...

otherwise, did you connect the fluid level sensor?
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Old 04-01-2007, 10:17 PM   #5
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Default Re: '91 Olds 98 Master Cylinder Replace

Quote:
Originally Posted by dandyd
Had to replace the Master Cylinder.....could not figure a way to bench bleed as the resevior had a hole on the opposite side for the tubing that ran down to the ABS system...had no way to plug that hole. Put it on the booster....attached the tube.....put plugs in 2 holes on MC with 2 clear tubes. Had my daughter depress the bake until no air bubbles. Bleed the lines at the calibers etc....Now when I start the car, the red "BRAKE" light stays on. The vehicle seems to brake fine, and the pedal feels normal. I've replaced this cylinder about 5 years ago and don't remember this problem. What'* up? Obviously, I fiqure I still have some air in the lines......re-bleed?

Thanks
Sounds like you did it close enought to Right. That hole from the ABS is a return line, back into the resevoir. The ABS works by releiving brakeline pressure for the tire(*) that aren't turning and that brake fluid needs a place to go.

I'm going wtih the others, the e-brake is partially down or the fluid level sensor is the problem.
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Old 04-02-2007, 12:13 AM   #6
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checked ebrake....no issues there.....rarely use it since I park my vehicle in the garage and our area is flat as a pancake on the east coast. Anyway, I was wondering if the interior of the resovoir could have gotten damaged in the area of the sensor. My only thought.
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