Hi guys, I'm having some brake issues with my 90 xj, non abs. When I apply mid to hard pressure on the brake pedal the drivers side rear wheel locks up, the passenger side rear does not lock. A while back it looked like something leaked on the drivers side rear tire, so I pulled the drum off but found no leaks. It's also pulling to the drivers side when I brake. Thanks in advance for any help.

 

The right rear wheel cylinder may be siezed. Replace them in pairs.

 

I wouldnt have thought to check the right hand side so thanks.

 

How do I tell if a wheel cylinder has seized?

 

Usually rear brake fluid leaks at the wheel cylinder when the shoes are very worn, and/or out of adjustment. When you brake, the fluid is under tremendous pressure and forces the pistons in the wheel cylinder to expand outward putting pressure on the shoes. If the shoes are badly worn and/or out of adjustment, the pistons travel too far out and fluid leaks by. When you release the brake, no more pressure, no more escaping fluid. So, you may see signs of the leak, but no active leaking with the drum off.
If the shoes are not worn excessively, the little star wheel can be adjusted wider to reduce shoe travel. The star wheel is part of the 'automatic adjuster' designed to self adjust the brakes.
From what i've seen, a lot of people tend to ignore their rear brakes until there's a problem, and th self adjust doesn't work properly. They should get regular maint. (clean,adjust, grease etc) After 10 years the brake hardware should be replaced as well. Springs are fatigued over time due to heat & regular use.
As far as "how to tell if it's seized?" With the drum off, put your palms on the upper part of the shoes (where the wheel cyl. is) and shove 'em back and forth (front to back) You should be able to see the rods sliding back 'n forth.

 

Thanks for the info.

 

Definitely sounds like the wheel cylinder like bustedback said.

Do them in pairs for sure.

 

Thanks for the conformation.