Mazda MX-5 1.8 NB 2004 - MX-5 Binding Brake - Xena

Hi all, I'd welcome your advice before I get my wallet out. I recently noticed a slight drag when coasting. Further investigation revealed one very hot front wheel, the other wheels where all normal. Braking remains effective as far as slowing down is concerned. I removed the caliper checked slide pins and fit of pads - all looked perfectly okay. However, the problem remains after refitting the caliper and pads. Am I correct in thinking that the piston is probably seizing in the bore of the caliper and not returning properly? Is the next step an exchange calliper? Opinions much appreciated.

Edited by Xena on 10/01/2013 at 20:16

Mazda MX-5 1.8 NB 2004 - MX-5 Binding Brake - mazda60

Hi,

I have had this happen twice both on low mileage vehicles.One front caliper and one rear.

The first was on my daughters 1997 Honda CRX (o/side front) when the alloy became very hot.

I was able to push the caliper piston back into the bore by hand without removing the caliper.

In difficult cases you may need to remove the caliper completely for easier access.

Having freed it ,refit the brake pads and wheel and check it turns by hand .Apply foot brake gently to lock the wheel and check if the wheel is binding after pedala is released.

If still binding you can go through the same process again and repeat the proceedure above.

On this occasion it worked ok and my daughter had no more troublel

It has been pointed out to me that corrosion of the caliper bore is a problem on low mileage cars and that as pads wear down the piston travels up in the bore further when it may meet some rust and stick, so possibly consider fitting new pads ,perhaps, as a first option.

If it still binds your will probably need to change the caliper but do this in pairs, if you are considering reconditioned units, otherwise you may upset braking performance.

Some refurbing companies will only do them in pairs anyway

Hope this helps.

Mazda MX-5 1.8 NB 2004 - MX-5 Binding Brake - bathtub tom

The sad ole sods here like GB and me take our brakes apart every year, push the pistons back and forth a few times, clean and lubricate the slides and pump a bit of new fluid through the system.

We've had sticky pistons, but not for twenty-odd years!

Mazda MX-5 1.8 NB 2004 - MX-5 Binding Brake - dadbif
I am not alone, I thought I was the only one who checked his calipers at every service..
Mazda MX-5 1.8 NB 2004 - MX-5 Binding Brake - gordonbennet

We've had sticky pistons, but not for twenty-odd years!

Oy, less of the 'old'..:-)

He's right though, an hour or two a year to keep the most important part of a car in tip top condition is one of the best and cost effective investments you can make whatever the make and model of car you drive.

Unless you actually take the pads out you cannot examine them properly, wouldn't be the first time i removed slightly worn rear pads only to find the friction material fall away from the backing plate where it was only held in place by a lump of rust.

This peering through or from behind a wheel at the brakes the modern techinician practice and pronouncing all is well is complete tosh.

Oh and don't forget you sad ole sods to give the brake pipes and cables some lubricant, and wire brush the calipers and drums then give 'em a coat of black Hammerite every other year (peaked cap brigade colour if you must), looks a dashed sight better than a rusted neglected set of brakes through the wheel spokes.

edit..welcome to our peculiar club Dadbif..;)

Edited by gordonbennet on 11/01/2013 at 18:48

Mazda MX-5 1.8 NB 2004 - MX-5 Binding Brake - Cyd

Include me in the old f*** club. Except I do mine every other year. Fronts one year, rears the next and so on.

My wifes car is used every day (unlike mine which can spend up to a fortnight in the garage at a time) and we've never had this problem with it as a result. It seems to need new pads about every 3 years or so anyway.

Back in my rallying days a clean and bleed was performed every three events!

Edited by Cyd{P} on 11/01/2013 at 19:44

Mazda MX-5 1.8 NB 2004 - MX-5 Binding Brake - Xena

Thanks to everyone for their advice. I ended up having to fit an exchange caliper. The piston remained very stiff despite several attempts to free it up by pushing it in and out. The piston was corroded due to the poorly fitted boot seal.

I'd be interested to hear whether you guys think it necessary to fit replacement calipers in pairs? There sems to be a lot of mixed opinion on the web.

Mazda MX-5 1.8 NB 2004 - MX-5 Binding Brake - TeeCee

I'd be interested to hear whether you guys think it necessary to fit replacement calipers in pairs? There sems to be a lot of mixed opinion on the web.

Calipers are expensive enough that, if the other one looks OK, it's worth leaving it. Given that you reckon that the fault was caused by a poorly fitted seal, if the other side looks OK in this area it's likely to be sound for some time to come.

Mazda MX-5 1.8 NB 2004 - MX-5 Binding Brake - madf

I have changed /rebuilt calipers in ones. Never any issues. In 10000 years,

 

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