AE86 rear brakes seizing

[TurboRA28]

Hi all, just after some info on troubleshooting a problem on the ae86 where after you park for awhile (10mins or so) and try and drive off, the rear brakes have seized up. By driving the car back and forth a bit, like rocking it, you hear a loud crack as they free up.
Only happens when you use the handbrake also.

I have checked the shoes and they still have some material on them, probably getting close to needing replacement but its not like metal on metal yet.

The handbrake isn't overly tight. You can still spin the wheels when they are jacked off the ground.

One thing I did notice is the rear slave cylinders are leaking. So i'll replace those but I wouldn't think that'd cause the seizing.

Any ideas?
Thanks
Joel

[Sam_Q]

I have no idea about brakes so this will be a real long shot but I would think that your handbrake mechinism needs to be taken apart and given a good service, failing that you could change the whole lot to corona rear disks with corolla calipers

sorry I know my post probaby doesnt help you much

[TC1600]

Yeah lube up all pivot/contact points for the rear brakes, and make sure everything moves freely. Just be careful not to get any grease on the friction surfaces of the linings or drums. I use moly grease, just a tiny amount goes a long way.

[oldcorollas]

grease or brake fluid + dust = sticky goop...

the sticking could be from the fluid leaking onto the pads.
the crack indicates the pads themselves are sticking, rather than just the pistons sticking...

first, pull out pads, sand off the top surface, clean the metal friction surface, and then see if they stick soon after....

and fix up the leaks

[TC1600]

Oh yeah, and don't forget the drums will contract as they cool, which means they will be holding tighter on to the linings, so that may bind them up until the car moves and they spring back into place (which could be the sound).

[allencr]

... rear brakes have seized up. Only happens when you use the hand-brake... Any ideas?

Uh, the hand-brake?
It has cables & levers - see that they operate freely. Old cables that have corroded up inside might work a few more years if you can get some stuff into its nasty spot/s, like a rust remover, PB Blaster or such to free it up, followed by oil. Hitting the cable along its length with a hammer & bucking bar will mess up its plastic cover, letting in more moisture later on, but it will usually free it up for right now.

Also, they are wheel cylinders.

[thechuckster]

self-adjusting mechanism for the hand-brakes could be not working right if the pads are close to being worn-out.

Are you having to pull the handbrake a long way up to get it to hold the car?

[oldeskewltoy]