Sticky brakes?

[dansomerville]

Car - 83 JDM Trueno Notch.

Motor - Bigport 4AGE

Use - Project/Weekend toy.

Problem - Stuck/Noisy rear brakes.

Occurs/Started When - All the time/Since I bought it.

Personal Situation (if applicable) - I'm rather short.


Hey guys and girls, I have a 83 JDM Trueno. I feel like my brakes are sticking or something.

Under normal driving the rears sound like there grinding, like a constant whirring noise from the rear of the car? or the rear brakes, I'm not sure, and sometimes when I reverse after having the handbrake on the car is hard to move and makes a loud grinding squeal until you move forward again. Noise is always there.

The car has Project Mu pads in it from the previous owner, the noise is in the rear, could it the pads be just really worn out? (I haven't had time to check yet, although it still stops pretty quick) or another problem?

Stuffed/seized caliper pistons?
Worn pads?
Handbrake issue?

I dunno.

I've ordered a whole new pad and rotor setup for my car, but unsure if this will sort it out?

Any help would be greatly appreciated, Thanks.

Dan.

[Cerby86]

have you tried lubricating the slides on the calipers? That would be my first stop and while your at it i would check how much meat is left on the the pads. Also check how much your handbrake is adjusted up. another thing is the handbrake separate to the disc brakes on the jdm? Like does it have an internal drum setup? That pad may be worn or adjusted up too far.
Another thing is might be bearings. I once had a bearing so badly blown that the disc moved with the caliper. You'd use the brakes and pulled the caliper in and pull the disc up straight then when you let it off the disc would sag over against until you cornered or hit a bump!

[dansomerville]

Hey there, thanks for replying.

I haven't had time to look at anything yet, hopefully tomorrow I'll pull the wheels and have a look around.

Do you mean the calipers sliding side, what and how would I go about lubricating those?

The noise and feel it makes in reverse is exactly like when you accidentally leave your handbrake on and drive, and when your driving it sounds just like a constant whirring like somethings rubbing constantly, and gets louder when you apply the brakes.

The handbrake being internal or not I'm unsure I'll look tomorrow.

I'm leaning toward the hand brake could be tensioned way to high, but I'm stuck thinking, you'd have to be a mega dumb ass to do that and not notice you'd gone to far. I'll jack the rear off the ground tomorrow and try and rotate the wheels with the hand brake off, and pull the pads out, and check the sliders.

Thanks.

[dansomerville]

Ok so this afternoon I pulled off the wheels and had a look around.

- The handbrake is not separate to the brakes but doesn't look to be the issue, I wound it right out and it's fulling resting on the stop when the brake is off.
- The left rear looks all ok, pads are stuffed yes but rotor wear is normal and the slider is functioning properly (by this I mean I can push it in by hand and it returns out by itself, I'm assuming this is how it's supposed to work?)

- Lastly the rear right, not so good. The pads are really bad, and the rotor is worn horribly, it's only around 5mm thick. And I'm assuming it's because the slider seems to be jammed, I can't get it to budge at all.

So where do I go from here, Is this my problem do you think?

How do I get the slider apart to lubricate it? and what with?

Thanks a lot, Dan.

[Cerby86]

ahyep That right there would be your problem! hahah i'm watching dukes of hazzard right now

well i'd check if you get fluid out the hose when you dab the brakes. Then I would unbolt both sides of the caliper (like the two bolts holding the outer part of the caliper on) then I would undo your brake line and use something like a g clamp to squeeze the pot back. Hopefully once you get it pushed back you can bolt it back up and bleed it up and it will move around properly. To be honest though if its been that bad I would say the caliper is definitely in need of a rebuild if not stuffed. I guess you'll have to replace both discs, and the pads, so you may as well get them rebuilt and get the fluid flushed and put something nice in while your at it.
I never rebuilt a caliper so i don't know how involved it is but I think AJPS might have rebuild kits and be able to help you out!

[tottacrolla]

I expect the sliders are seized.
Remove the 12mm bolt that holds the caliper on, this bolt goes through the middle of the 'slider'
Once you have got both top and bottom sliders free you need to lubricate them, use only the correct 'rubber' grease as anything else
is likely to cause the rubber to swell.
The caliper piston needs to wound in rather than pushed in. Take note of the notches in the piston as these need to line up with the protrusions in the brake pad when you put it all back together.