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1998 Olds Achieva brake problems...
07-26-2011, 01:40 AM
Post: #1
Exclamation 1998 Olds Achieva brake problems...
1998 Oldsmobile Achieva SL, v6 3.1, auto trans. 150k mi, New England area
I recently replaced the left rear wheel cylinder on my 1998 Oldsmobile Achieva SL and, like an idiot, tried to bleed the brakes without replacing the drum on the outside of the rear wheel assembly. I had also taken the drum off of the right side of the vehicle so I could compare the two sides and ensure that I was putting the left side together correctly. The right rear wheel cylinder burst during the bleeding process. Once again, I replaced the wheel cylinder, but on the opposite side. This time I went to bleed the brakes and noticed that there was little to no pressure building under the pedal. When I turned the car on, the brake lights stayed on and the pedal had to be pulled up and held in this position in order to turn the brake lights off. When the car is off I can build enough pressure in the brake system to bleed the brakes by pulling the brake pedal up and pushing it to the floor. I know that pressure is being maintained in the brake system when the car is off because once the bleeder is loosened, the pedal then sinks all the way to the floor.
So with the car on, I have a useless brake system I can't keep pressure in and the brake pedal sits at half mast with the brake lights on unless I hold it in a fully returned position with my foot. With it off, I can build pressure in the brake system and bleed the brakes, but I have to force the pedal to fully return in order to do so. This was not a problem before I started messing with the rear brake shoe/drum assembly in order to fix this leaky wheel cylinder which has just turned into so many different problems.
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07-26-2011, 11:29 AM
Post: #2
RE: 1998 Olds Achieva brake problems...
Two things to check..... crack a bleeder on the front while someone holds the pedal to see if that will reset the proportioning valve and correct the pedal issue. If it doesn't you may need to replace the flex hose to the rear wheels. They come apart internally and sometimes trap the fluid / pressure.

Let us know if that helps.
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07-26-2011, 07:08 PM
Post: #3
RE: 1998 Olds Achieva brake problems...
One other thing to check would be the break pedal return spring. If the pedal isn't coming up on it's own I would suspect that the spring broke or came off.

Please let us know what you find.

Thanks for using the forum,
Garner

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07-26-2011, 08:47 PM
Post: #4
RE: 1998 Olds Achieva brake problems...
Most cars these days don't have a return spring but I could have missed one.
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