1990 Buick Century custom, 3.3 V6, 4 door automatic. I have replaced the linings, wheel cylinders, both rear drums on this vehicle. When the linings are tight to the drum the brakes seem to operate correctly. I have often experienced a "locking up" of the right rear brake. It seems as if the brake shoes become loose (out of adjustment).I have used the parking brake to try and "self adjust the rear linings as it is my understanding that this is how they work.Since I purchased the vehicle used I even ordered and compared the self adjuster (they were both correct). I'm surely confused. If anyone has any suggestions I'd love to hear from you.

is ther a rear brake equaliser on the rear axle? this is usually spring operated that pulls up on the rear brake limiter depending on load in vehicle may be stuck in the vehicle loaded position when the vehicle isnt carrying much weight worth a look , just jack up rear end and look for spring device centre of rear axle attached to a device with the brake lines entering/exiting if there get vehicle as high as safe to do then put blocks under rear wheels then slowly lower jack and look to see if the spring device moves down with the vehicle if not this could be the problem as is exerting pressure to rear brakes so causing them to over heat keep me posted

Brake lines by rear door on drivers side are a common failure point. lines under door failing can cause a total brake failure. Just replace and bleed the lines.

you gotta change the rear axle, only way to do that.

If they are drum brakes then it is most likely the wheel cylinder. these are not expensive but you will need to replace the rear brake shoes and clean all the parts with brake clean. I recomend replacing the other cylinder while your at it.

This is what you do take the door skin off of the inside of the door and at the top corner there will be i think three nuts and than your going to need door clips after your done in order to put the door panal back on

I would guess it is metric,as are most all bolts,except some large size chassis bolts,and have been since about 1983. You got rust issues also.

It is quit easy just make sure you have the routing diagram there is usually a sticker under the hood. the belt tensioner has a cut out in it that fits a 3/8" or 1/2" drive ratchet to use as a lever.

MAKE SURE PARKING BRAKE IS OFF.BUT IF MASTER CYLINDER PISTON NOT RETURNING.IT CAUSE BRAKES TO DRAG.ALSO RESTRICTED BRAKE LINE AND HOSE.ALSO WHEEL CYLINDERS OR CALIPERS STICKING.

Check fuel pressure after replacing filter. Fuel pump may be going bad.

Drum, Rear Brake System Standard Rear Brake

Item Part Number Description 1 2069 Brake Shoe Hold-Down Spring Pin 2 — Rear Wheel Cylinder Retaining Bolt (2 Req'd) 3 — Washer (2 Req'd) 4 — Anchor Pin (Part of 2211) 5 — Wheel Cylinder 6 2028 Brake Shoe Anchor Pin Guide Plate 7 2A637 Parking Brake Lever 8 2296 Brake Shoe Retracting Spring (Short) 9 2296 Brake Shoe Retracting Spring (Long) 10 2200 Rear Brake Shoe and Lining (Secondary) 11 — Washer 12 2106 Parking Brake Lever Pin Retainer 13 — Brake Shoe Adjusting Lever Cable Guide 14 2A642 Primary Brake Shoe Parking Brake Lever Link 15 2A601 Parking Brake Link Spring 16 2068 Brake Shoe Hold-Down Spring 17 2A176 Brake Shoe Adjusting Lever 18 2048 Brake Shoe Adjusting Screw Socket 19 2047 Brake Shoe Adjusting Screw Nut 20 2041 Brake Adjusting Screw 21 2049 Brake Shoe Adjusting Screw Spring 22 2200 Rear Brake Shoe and Lining (Primary) 23 2A178 Brake Shoe Adjusting Lever Cable 24 2211 Brake Backing Plate
Heavy Duty Rear Brake

Item Part Number Description 1 — Rear Wheel Cylinder Retaining Bolt 2 00538 Lock Nut 3 2212 Rear Brake Backing Plate 4 2262 Rear Wheel Cylinder 5 2A642 Primary Brake Shoe Parking Brake Lever Link 6 2A601 Parking Brake Link Spring 7 2A637 Parking Brake Lever 8 2106 Parking Brake Lever Pin Retainer 9 — Parking Brake Lever Bolt 10 — Secondary Shoe Assembly 11 2A179 Brake Shoe Adjusting Lever Cable Guide 12 2068 Brake Shoe Hold-Down Spring 13 — Adjusting Lever Pin 14 — Adjusting Lever Return Spring 15 2A176 Brake Shoe Adjusting Lever 16 2047 Brake Shoe Adjusting Screw Nut 17 2049 Brake Shoe Adjusting Screw Spring 18 2041 Brake Adjuster Screw 19 — Primary Shoe Assembly 20 2068 Brake Shoe Hold-Down Spring 21 2200 Rear Brake Shoe and Lining 22 2035 Brake Shoe Retracting Spring 23 2A178 Brake Shoe Adjusting Lever Cable 24 2092 Brake Adjusting Hole Cover 25 2069 Brake Shoe Hold-Down Spring Pin
The rear drum brakes:

• Have internal shoes that expand against the brake drum (1126).
• Are a single-anchor type.
• Are actuated by one rear wheel cylinder (2262).
• Have two pistons in the rear wheel cylinder (2261). One exerts force against the upper end of the primary shoe; the other exerts force against the upper end of the secondary shoe.
• Adjust rear brake shoes and linings (2200) automatically.
• Need manual brake adjustment if the adjusters are not operating properly or after the rear brake shoes and linings have been replaced.

When the brake pedal is applied, hydraulic fluid pressure forces the pistons in the rear wheel cylinder outward, moving the rear brake shoes and linings against the brake drum.
The rear drum brake system includes the parking brake mechanism. Refer to Section 206-05 .