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Old 10-18-2011, 05:42 PM   #1
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Default 1991 Cutlass Brake system

Hey guys,
My Dad has a 91 Cutlass Supreme Coupe and it has been sitting for some time now due to a brake issue. When you depress the pedal it has about the same effect as standing on a brick. It is very hard and doesn't have much impact on braking at all, making it undriveable. This car has a good amount of issues but this needs to be fixed first. I know it is the power master 3 by Bosch IIRC... What I need to know is what is the easiest/cheapest way to replace the power booster and or master cylinder on this car to a different system maybe to make this car driveable again...
Wake might be able to chime in here too since he'* seen the car.
Thanks in advance
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Old 10-18-2011, 05:53 PM   #2
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If the peddle is hard, then you have no vacuum assist. Check to make sure you have vacuum to the booster before you move forward.
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Old 10-18-2011, 05:55 PM   #3
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What would be the best way to go about that on this car? I look at under the hood and make a sourface...lol >.<
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Old 10-18-2011, 06:11 PM   #4
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You can find the vacuum line that goes to the brake booster, and check to see if its cracked, or still intact.

Don't forget, the car has to be running for the brake pedal to function properly.
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Old 10-18-2011, 06:19 PM   #5
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The brake booster line is on the brake booster it will on the passenger facing side. It'* a rubber hose that has some sort of a clamp at the end. It runs to the intake manifold. Find it check for cracks in the line. If it has any kind of wear replace it.

That is were you get the assist to your brakes.
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Old 10-18-2011, 06:42 PM   #6
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There is also a check valve on the end by the booster. If that'* stuck closed it can cause a problem. Can't say I've ever seen that, but possible.
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Old 10-18-2011, 09:17 PM   #7
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Is this an ABS system, and is it the same system used on the 88-91 Bonneville? If so, it works differently than most other ABS designs, and I believed used an electric assist. Can you post a pic of the Master Cylinder and other primary underhood braking componants?
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Old 10-18-2011, 09:18 PM   #8
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Alright I'll check it when I get a chance. Thanks guys! I'll update later on.
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Old 10-19-2011, 01:57 PM   #9
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Just from what I remember isn't this an electronic system? Meaning there is no vacuum assist? I can't recall whether it was this one or not. Anyway, what happened exactly was he was doing about 30 mph, and had to panic stop, at which point he heard a mechanical "click" noise and the pedal went hard the next time he hit it. The Brake and ABS lights were on before this and remain on now, Does the paperclip trick work on this car?
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Old 10-19-2011, 04:31 PM   #10
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I believe so. We had a code scanner that would pull OBD 1 codes and ABS codes. I think it is just a $40 oversized paperclip, but I believe one pin will deliver ECM codes, and another will deliver ABS codes. Not sure which pin it is. You may want to check fuses, because I believe it may be an electronic pump, and if the fuse is blown, I believe you will encounter the symptoms you describe.

Oh, and fuses make that noise when they blow. Check all fuses, including the large Maxifuse. They are big enough that they may blow loud enough to hear.
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