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Buick Lesabre brake systems

Tiny
DIANERZEBET
  • MEMBER
  • 1989 BUICK LESABRE
  • 150,000 MILES
I have two Buick LeSabres, a 1989 daily driver and a 1990 parts car. The '89 has a regular double master cylinder on a brake booster under the hood while the '90 also has a small tank labeled 'brake fluid under high pressure' next to master cylinder. What is the difference in the two systems and can they be safely interchanged by an amateur home mechanic if needed? So far I have used two brake lines to keep 89 on road. Also what is difference in electrical systems between a custom and the non custom?
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Monday, June 13th, 2011 AT 6:34 AM

3 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
The '90 has anti-lock brakes. Some of the steel lines might be the same but that's it. I'm not sure which system is used on that car, but if it's the Bendix-9 which is similar to Chrysler's Bendix-10, to safely remove that accumulator, pump the brake pedal at least 40 times. If the car has been sitting a while without a battery or turning on the ignition switch, the high pressure has probably bled off already on its own.
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Monday, June 13th, 2011 AT 7:41 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
To add to this, no, they are not interchangeable.
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Monday, June 13th, 2011 AT 10:05 AM
Tiny
DIANERZEBET
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Thanks so much for your replies. I was having problems with internet connections.
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Saturday, August 20th, 2011 AT 2:22 AM

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