The brake fluid reservoir will be located toward the back of the engine bay on the driver's side, up high where it's easy to access. Once you locate the brake fluid reservoir, you will see markings on the side that tell you if you need to add any brake fluid. You may need to clean off a little road grime to see the marks clearly.
The brake caliber is sticking if it has rear disc brakes. The rear wheel cylinder is sticking if it has rear drum brakes. Replace both rear units and then drain all the old brake fluid out of the system and replace it with fresh fluid. Bleed the brake system.
You can cutoff the rear brake line. You will no longer have rear brakes and the fluid will leak out. It is not recommended that can't off the rear brake line, without replacing it.
To replace the rear brakes on a Volvo 850 you must first remove the old brakes. Then connect all of the wirings to the new brakes including the brake fluid line and the connection for the brake pads.
Check the ABS Dump Valve. If not operating, little or no fluid to rear brakes.
If you are losing fluid and the pedal is low, you have a brake fluid leak.
The brake cylinder connects to both front and rear brake systems. The front and rear brakes are connected though a diagonal fluid distribution system. any more questions email me at philip.dharamraj@hotmail.com
change the wheel cylinders or the brake lines
you may have a blockage on that line.
have you checked your brake fluid??
If the rear brakes are smoking, the parking brake cables may be frozen. The dash light may indicate that the parking brakes are released but the switch for the light is connected only to the parking brake lever NOT the actual parking brake shoe assembly. Another possible cause for rear brake lock-up is a malfunctioning rear brake proportioning valve. This valve controls hydraulic pressure to the rear brakes. Brake fluid absorbs moisture and should be changed on a regular basis. Vehicle inactivity and moisture in the brake fluid is a recipe for frozen or rusty brake components. Hope this helps you out!
You probably have a leaky wheel cylinder. Have the brakes inspect now!
First, please understand that rear brakes do not work as hard as front brakes. The ratio of working is 60% front brakes and 40% rear brakes. Therefore, they do not wear out as quickly. Is this your observation and reason for asking the question? Second, if your rear brakes really are not working, you will experience a longer distance to come to a complete stop. Are you experiencing this? If so, then you really do have a problem with your rear brakes. You will have to check that the brake fluid is flushed (old brake fluid gathers moisture from the air and does not work as well) and you will have to check to see if any of the rear brake parts are "frozen" -stuck in place so that they do not squeeze the brake drum or disk. Please let me know how it goes. Your colleague in New Jersey