New discs already warped!

£30 for a pair of discs? Good discount, or shoddy discs? I wouldn't cheap on buying brakes, them and tyres are the two things I like to spend a decent portion of money on.
 
£30 for a pair of discs on a car that heavy seems very cheap. However, I doubt you have warped the discs, in fact, what makes you thing you have?

Checking for a binding caliper is easy enough, after a stint of 20 + mins of driving, stop and see if any of the wheels are hotter than the rest.

If you changed the pads I assume you checked the piston was free by winding it, and also greased the sliders?

Need to know why you think the discs are at fault for any more advice.
 
A seizing caliper on my car caused the pad to leave large deposits on a front disc once. As others have said, it could well be that/incorrect bedding in and not the cheap discs at fault (I've utterly hammered cheap grooved discs before with no issues).
 
Jamous said:
Unless of course the drive flange is damaged from the fitting of a wheel bearing (another common Mondeo fault), people hit the edge of the flange with a hammer to remove it and often burr the edge over causing a high spot and the disc doesn't sit flat.
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That and not cleaning the surfaces down properly before fitting too. Worth a strip down and taking look
 
Biohazard said:
Did you do the work?

Why didn't you play with the piston? See how it was?
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Why do you assume I didn't?

I did extend both pistons when changing the pads to check the seals and movement. Both extended easily and pushed back in fine too. In fact, I was surprised by how good a condition they were in having this year changed the callipers on my Mrs. same-age Fiesta.

When fitting I gave all surfaces a good wire brushing removing all deposits. Cleaned up everything really well (including new discs with brake parts cleaner) and copper greased the hub and rear of pads.

Someone posted about greasing the sliders? What does this entail, not sure I did this?

The rear pads did have these weird springs attached to them which I may or may not of fitted correctly. I don't think steering wheel shudder would be felt from the rears being wrong though?

I'll hunt for a picture of this clip thing.

The reason I believe a disc is warped is that when braking (most noticeable at speeds of 50mph +) I get judder felt through the steering and entire car.

I have recently had 2 new front tyres and the tracking done. The problem existed before this.
 
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that link also has this at the bottom though:

MYTH # 6 - The brake fluid reservoir should be topped up during routine service.

In most modern passenger cars, the brake fluid reservoir is designed with a specific volume and is equipped with an internal float. The volume corresponds to the amount of fluid that will be displaced when the pads have worn to the point of replacement plus a generous reserve. When the replacement point is reached, the descending float completes an electrical circuit and a light appears on the dash warning the driver that the pads should be replaced.
If the brake fluid is topped up the first warning of warn out pads will be the screech of steel backing plate against iron disc. This will be both annoying and expensive
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I don't buy into that, you know when your pads need replacing, you look at them and feel them going? Or no no no you go by a light on the dash?
 
To check if the discs really are warped you would need a DTI gauge to measure the runout/deflection in the discs surface. I see that you mentioned that you are not sure that you refitted the rear caliper springs correctly, this can cause shuddering under breaking which can feel like warped discs.

Oh, did you bed the brake pads in at all after fitting?

Matt, Former Ford Motor Vehicle technician 1996-1999 :cool:
 
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thepedster said:
that link also has this at the bottom though:



I don't buy into that, you know when your pads need replacing, you look at them and feel them going? Or no no no you go by a light on the dash?
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Even if you do go by the light all of the cars that I have experienced have a wire running through the pad material which when broken illuminates the pad wear indicator.
 
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