Toyspeed.org.nz Message Board

by **fuzzilogyc** » Mon Jun 25, 2007 9:32 pm

hey guys,

My AE92 corolla just failed its WOF, reason: 60:90 brake balance at the back. Now, this happened about 3 WOF's ago, and i spent like $700 getting it fixed at pit stop. They replaced brake bias valve, skimmed the rotors, put new pads in, and completely flushed the fluid.
Its the right rear thats weaker. I checked the lines and caliper for leaks, but didn't find anything. Both pads seem even and in good nic. Rotors too. Any ideas? Need a rebuild kit?

Website · by **Bling** » Mon Jun 25, 2007 9:34 pm

I had same problem, and will be getting mine rebuilt I think.

for the purpose of wof tho, take the pads out and give them a sand, rotors too if you're keen. does the trick, but doesn't solve the problem really :cry:

by **fuzzilogyc** » Mon Jun 25, 2007 9:36 pm

tru tru...
what kind of grit sand paper? only on the weaker side?
also, when you doing the rebuild? would be great if you could tell me how it goes... but the results really depend on you having a brake balance checking machine around doesn't it?

by **Alex B** » Mon Jun 25, 2007 9:52 pm

Go get some emery(sp) cloth its about 120G i think. Comes in a few diffrent corses i think.

by **fuzzilogyc** » Mon Jun 25, 2007 9:54 pm

is normal sand paper not good enough? haha

by **Alex B** » Mon Jun 25, 2007 10:00 pm

Emery is probly just a bit easier to play with, has a cloth backing, its not expensive. And yeah sandpaper will probly work fine.

by **andyztouring** » Mon Jun 25, 2007 10:34 pm

Have you bled the right brake?sometimes it only requires rebleeding .

by **fuzzilogyc** » Mon Jun 25, 2007 10:52 pm

yeah tried that... dunno if its worked... will see when i go in to get the recheck....

by **andyztouring** » Mon Jun 25, 2007 11:15 pm

Was there any air bubbles come out when you bled the brakes?

by **fuzzilogyc** » Tue Jun 26, 2007 12:05 am

umm don't think so... can't be sure though cos fluid came out straight away but might have been a bubble there too...

by **Allister S** » Tue Jun 26, 2007 2:23 pm

Ok, Have you pulled your calipers away from the pads and checked your slides? If you have a lot of play or a slide that is seizing up you will get poor braking from that caliper. Often slides are a bit corroded inside or out of grease. You can sometimes free up the slides and regrease them to regain function.

Cheers.

by **fuzzilogyc** » Tue Jun 26, 2007 2:25 pm

what is the slide?

Website · by **Bling** » Tue Jun 26, 2007 6:02 pm

I don't recall the grit of sand paper I used, was a bit more coarse for the pads as mine were a bit glazed. But i'd say 300 or so should do it.

emery cloth is good tho, quicker with it. Can't get it in rectangles from places like spraystore and mitre10 etc, in painting section

by **Lloyd** » Tue Jun 26, 2007 8:49 pm

Is it low on foot brake, hand brake or both?

by **fuzzilogyc** » Tue Jun 26, 2007 9:03 pm

"service brake"... i think its foot brake

by **Allister S** » Wed Jun 27, 2007 2:18 pm

All of the corolla calipers are single piston sliding calipers so you have a piston on one side (inboard pad) and supports that press on the other pad (outboard pad). For this to work (or float) the whole caliper is mounted on slides. These only move a small amount when braking and so are prone to rusting and seizing. I tried to find a good diagram but nothing was really clear. Check out the following link though.

http://www.off-roadweb.com/tech/0401or_4wd_brakes/

Best to add some grease under the little rubber boots if they're sticky/rusty/loose and move them around to ditribute it.

http://www.geocities.com/ae82supercharg ... c_Orig.JPG This shows a AE82 rear brake and you can see the little rubber boot at the top of the caliper - this is the seal for the top caliper slide. The bottom slide has 2 rubber boots.

by **fuzzilogyc** » Wed Jun 27, 2007 3:20 pm

hey, oooh so those are the slides.
yeah, i pulled the caliper off them and seemed fine - no rust etc. i also tried to move it about a bit when it was bolted down, and there was a little movement - i suppose this is normal?
i'll take them in on thursday after bleeding that brake and sanding the pads a little and see what happens...

by **gmacrae** » Thu Jun 28, 2007 12:11 am

just get the calliper rebuild/reseal kit from toyota and be done with it. Its a straightforward job if you have some long nose circlip pliers if the handbrake operates the pads and not a drum. Oh, and dont use too much grease putting it all back together - i clogged the calliper on my very first attempt

by **fuzzilogyc** » Thu Jun 28, 2007 1:35 pm

got my warrant today...
just did a rebleed and sanded the pads...

might look at doing the rebuild. what tools are needed?
is it just replacing the seals inside the caliper?

Website · by **Bling** » Thu Jun 28, 2007 2:11 pm

gmacrae wrote:just get the calliper rebuild/reseal kit from toyota and be done with it. Its a straightforward job if you have some long nose circlip pliers if the handbrake operates the pads and not a drum. Oh, and dont use too much grease putting it all back together - i clogged the calliper on my very first attempt

one question, if theres a problem with the caliper itself, will replacing the seals actually fix this tho?

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Rear brake balance off - AE92

Rear brake balance off - AE92

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