2003 GT parking brake

Handling, suspension, and brake tuning discussions
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ZZvroom
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Joined: Mon Oct 07, 2019 7:12 am
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2003 GT parking brake

Post by ZZvroom »

My parking brake doesn't. It's too simple not to work but nobody told it that.

Pull hard, the cable is tight, but the car still moves. We've inspected everything, adjusted, taken up the cable slack, installed new shoes, sanded the inside of the drums. It mostly holds now when parked, but is totally ineffective when tested from 5 mph or so.

My friend and excellent mechanic suggested new rotor/drums because "We've tried everything else...." and I 'm installing them in a few days. I doubt it will help but...


Side question: where do the 2 rear cables connect the sole front cable?
zbyers
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Re: 2003 GT parking brake

Post by zbyers »

It's possible the cables are stretched beyond use, I think. The rear cables connect somewhere above the exhaust, behind a heat shield, on the way to the front of the car. You should be able to follow them decently to see where they go.
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ZZvroom
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Re: 2003 GT parking brake

Post by ZZvroom »

But when I pull the lever, the cable is taut up there.
(There are more clicks available on the lever..)

The two cables vanish into the Twlight Zone above the heat shields.
andrewclaus
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Re: 2003 GT parking brake

Post by andrewclaus »

I think you're going the right way with the new rotor/drums. Hopefully the old ones weren't contaminated with anything (grease, brake fluid) or the new shoes are now contaminated also.

It may be possible the drums are beyond spec and the shoes aren't contacting the drums correctly. Or someone drove with the brakes applied and damaged the drum.

You've verified that both sides are working the same? Both sets of shoes move and are contacting the drum? Both rear cables are tight with brake lever applied?

If it's not the friction surfaces, it must be the cable system. I've never run into this, so I'm speculating. If one of the rear cables is frozen, the lever will feel tight but only one brake will be applied.
ZZvroom
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Re: 2003 GT parking brake

Post by ZZvroom »

We adjusted, tested, adjusted again, both wheels.
No grease or oil in the drums. I wire brushed them and used emery cloth.
My mechanic friend wonders about the quality of the cast iron but that's a Hail Mary.

I don't like the lever; I wish it went to horizontal when released and had more travel, but doubt that is the cause of my grief.
ZZvroom
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Re: 2003 GT parking brake

Post by ZZvroom »

update:

New rear rotors
New shoes
adjusted everything.

It now holds at least on level ground, but little more.
andrewclaus
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Re: 2003 GT parking brake

Post by andrewclaus »

Maybe they need to be "bedded in." Try a few easy stops with the parking brake while driving.
ZZvroom
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Re: 2003 GT parking brake/Matrix

Post by ZZvroom »

Decided it is the backing plates flexing.

I'm seeking the corresponding Toyota Matrix part numbers for the plates. Can anyone tell me how to locate same?
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joatmon
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Re: 2003 GT parking brake

Post by joatmon »

ZZvroom wrote: Sun Feb 06, 2022 7:00 pm Decided it is the backing plates flexing.

I'm seeking the corresponding Toyota Matrix part numbers for the plates. Can anyone tell me how to locate same?
There is a PDF of 2003 Matrix parts here at http://www.genvibe.com/images/misc/manu ... atalog.pdf
In that PDF, on page 15 of 17 (page number 1187) it says the Toyota part numbers for the backing plates on an XRS (Vibe GT equivalent) are
R 46503-20070
L 46504-20070

Looking online those things are $200-$300, so if you buy them, I sure hope they fix the problem
ZZvroom
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Re: 2003 GT parking brake

Post by ZZvroom »

Thanks!
zbyers
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Re: 2003 GT parking brake

Post by zbyers »

Buy them out of Canada if you can...They used to be like $50/ea there.
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tpollauf
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Re: 2003 GT parking brake

Post by tpollauf »

Reading the original issue here reminds me of my 2004 Vibe GT, although it really doesn't bother mu much at this point. With parking brake lever pulled up all the way, the car will roll backwards BUT not forward. My driveway is on a slight incline so if I really want to use it, then I back the car up where the park brake is effective. Weird sort of and I'll address this issue more in the future when performing wheel/brake work. For now I just live with it.
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