[Mk2] [NA] *sigh* front drivers wheel getting really hot!!

[Lewis Jay]

There is a vibration/juddering when braking from higher speeds, I forgot to mention this


Rich

This is because your discs are warped and/or you have a sticking calipers and/or slider!

[No_more_GT4]

It's not the sliders or caliper. They have been checked 3 times now for this very reason.

I'm going with the discs are fooked, so I'll be looking for a decent set of discs....... Any suggestions on where to get stock discs at a good price? Toyota will just bend me over & rape me...twice.

Rich

[going4the1]

Right - it sounds as though this may be a problem. With a situation like this you would notice additional brake dust on that wheel rim. But your seeing this from the overheating wheel anyway.

BUT

You must not assume that the disc is the problem. I had a similar issue on an old Carina E. It was actually the hub which had been damaged - this was causing the eccentric revolution of the disc. I could eventually hear the catching and initially put it down to a worn hub bearing. It was due to accident damage by a previous owner.

Before you waste any time and money. You have TWO options:

(i) take the car to a garage which can balance the wheels on the car. IF you have a damaged hub then the wheel itself will be spinning in an eccentric unbalanced way. The garage would confirm this in an instant. Of course you may be able to see this with you own eyes if you could get someone to spin the wheel whilst you look at the edge of the wheel rim. A warped disc has no effect upon the wheel eccentricity. The effect it has is only on the sliders which move in/out with each revolution due to the pads pressing against the disc. Eventually this friction will cause the overheating.

OR

(ii) Swap the pads AND discs from the front wheels with eachother. If the problem swaps to the other side then the disc is warped. If it stays on the same side then the hub might be the issue. This is a bit of a chore and I wouldn't pay someone to do this if you're not up to it yourself.

A damaged hub may also explain the juddering at certain speeds (assuming the wheels are correctly balanced)

I always use MINTEX pads and discs. They've never let me down - BTW new discs mean new pads as well

[Lewis Jay]

It's not the sliders or caliper. They have been checked 3 times now for this very reason.

I'm going with the discs are fooked, so I'll be looking for a decent set of discs....... Any suggestions on where to get stock discs at a good price? Toyota will just bend me over & rape me...twice.

Rich

Do not take your car to toyota!

Take it to a affiliant!

(see below for the list)

http://www.imoc.co.uk/forums/viewforum.php?f=18

Pacific works is probably the nearest to you.

Yes your discs maybe be goosed but they would not alone cause the excessive heat build up that you are describing.

You have come on here and asked for advice and been advised, take it mate, its free.

Take you car for a drive, get things warm (I say warm because I know of cars that have had sticky slider/pistons issues but are loose when cold). Then park on a slight hill with your handbrake off.

If your car rolls I am wrong.

Try it at different points as the warped disc will stop it at some point but it should role till it hits the warped section.

[No_more_GT4]

Thanks soo much for all your replies guys.

I've got new pads on there already. They're not even 2 months old & were replaced on the MOT renewal date.

I've just looked through the F/S/H I got with the car & it appears the discs were skimmed back in 2004 @ 63997 miles.

There doesn't appear to be any invoices/receipts for any replacement discs. Pads, yes, but discs, no. They could even be the original discs still on there & the mileage now is 96k

I'll jack the car up on Tuesday & get spinning the wheels.

By damaged hub, do you mean the hub on the wheel itself, or the hub on the car?

Rich

[going4the1]

The Wheel rim is bolted to the hub - The disc is sandwiched between. If the hub is damaged the wheel will also spin eccentrically.

If only the disc is warped then the wheel (and rim) will spin perfectly. It is movement inboard/outboard which you are looking for. It will only be very slight if present. Again - use the opposite wheel for comparison.

Good luck

[No_more_GT4]

Take the car to a garage which can balance the wheels on the car.

I got it now, I miss read your earlier reply. I thought you said take the wheel off the car & get it balanced

Rich

[No_more_GT4]

Well I got the new discs & pads on today (drivers side only) & guess what....................

I think it's the caliper thats at fault, as when I rewound the bottom piston it was pretty stiff. The top one wound back no problem, but the lower piston was tougher to wind back.

Anyway, I plugged on with fitting it all back together, placed the cap back onto the reservior bottle, turned the car on & pumped the brakes. Went to turn the wheel & it turned, but not freely. FFS


Now I'm no idiot, but I've been taking the advice of my mechanic who said, after checking said caliper, that 'The caliper was fine'. It was a re con caliper that was fitted in Jan '09 & now I need to replace it again

What are the chances of a rouge re con caliper getting through quality control at the factory, & making it's way onto the shelves

This is a right royal pain in the ass. This will be my first & last MR2 I can tell ya

Anyone wanna swap with a cheaper, more economical runabout

Rich

[going4the1]

There is nothing mysterious or otherwise about reconditioning a caliper. A piston (if smooth) rides freely on a rubber seal (if replaced). No other components are involved. All the rubber boot does is keep the dirt out.
The quality of the seals is obviously important. If the business which does the recon uses inferior components then problems will result.

Given this I believe that doing a DIY repair on a caliper will be equally as good as any unit bought on an exchange basis. (I did both of my fronts two years ago - they run perfectly).

TBH I cannot see how your mechanic could have checked the caliper without removing it and pushing the pistons back like you have. (he obviously didn't).

[Lewis Jay]

Well cant say I`m suprised mate, sorry.

I will also refer back to my previous post.

Take you car somewhere that knows and cares.

Lewis.

[No_more_GT4]

Thanks for all your advice guys, I really have appreciated the help

I fitted the re-con caliper today, & it's running fine so far. I'm taking the 10 month old re-con caliper I got fitted in Jan back to the parts shop for them to send off to be tested to see if its at fault.

I've taken photos & video of said rouge caliper, just in case there is any problems with the refund as I know what companies are like with refunding money .

Funk knows how the two mechanics I took my car to missed the seized piston they obviously didn't take the caliper apart. Maybe they just turned the wheel when cold & thought there wasn't any problem

It pi55es me right off as I took the mechanics advice, (seeing as though they're professionals that do this day in, day out) that the caliper wasn't at fault.

Three sets of pads, two calipers & a new set of discs which I probably didn't need & I'VE fixed it, & I have no mechanical training or background what so ever, just a bit of 'Saturday mechanic' tinkering on past cars & bikes.

The lower piston is seized isn't it? It's not just me hoping it's seized Photo taken after turning car on & pumping the foot brake.


Rich

[Lewis Jay]

Sorted.

[going4the1]

Well done!!