Buick LeSabre brake systems

1989 BUICK LESABRE

150,000 MILES

DIANERZEBET

MEMBER
2 POSTS

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?

Jun 13, 2011 at 6:34 AM

CARADIODOC

✓ASE Certified Mechanic
34,321 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.

Jun 13, 2011 at 7:41 AM

WRENCHTECH

✓ASE Certified Mechanic
20,761 POSTS

To add to this, no, they are not interchangeable.

Jun 13, 2011 at 10:05 AM

DIANERZEBET

MEMBER
2 POSTS

Thanks so much for your replies. I was having problems with internet connections.

Aug 20, 2011 at 2:22 AM

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