302mm carrier glide pins threaded

[850Red]

Hi. I thought that the noise was brake pads rattling, but it turns out that the glide pins were missing from my caliper carrier! Fitted new ones but they won't tighten, looks like the garage that fitted my new discs have threaded them.

What are my options here? I really can't afford new carriers as I'm out of work at the minute.

Any ideas welcome.

[volvo again]

Confused...if the guide pins were missing...what was holding the calipers on ??

[850Red]

The spring on the outside.

[turboboy]

I am presuming that the garage has stripped the threads in the carriers for the front brake caliper carriers?

Is this all four threads (two in each carrier)?

Options are either to go back to garage and tell them they have to sort it out at no cost to you (often easier to say than do from this side of a keyboard); replace the carriers with used ones (if you can find them) or remove the carriers and have thread inserts fitted.

Obviously you need the most cost effective solution which will partly depend on your mechanical skills and tools.

HTH

[acshortt5]

If they've cross threaded it they might be able to retap the threads in the carrier using a tap & die set. I don't know the size of thread pitch off the top of my head. Need to check the pins as well to see if they've damaged the threads on those but replacement pins are available and not a lot of money.

[850Red]

Right, so thread inserts then. Has anyone done this before?

[turboboy]

Originally Posted by 850Red

Right, so thread inserts then. Has anyone done this before?

Not on this sort of application but have done many times elsewhere.

You will probably have to take the carriers off the car to get decent access to make sure that you tap the new thread square to the mounting face (it is often difficult to do when you can only just reach and see when you are laying upside down under a car with the pouring rain being blown at you by the wind!!!!!!).

If done correctly a thread insert will be better than an original worn or damaged thread. In the aerospace industry inserts are often used during manufacture to provide a stronger thread in aluminium components.

[850Red]

Thanks. So do I need to widen the damaged hole to fit the new insert in?

[IainG]

Hi

Thanks. So do I need to widen the damaged hole to fit the new insert in?

It is a specific size drill. A special "oversize" tap is then used. The thread insert is wound into the new thread and forms a new original size thread.

The only problem I can see is the pins will have to be kept parallel. So really will need to be clamped and drilled in a proper pilar drill.

I would imagine drilling and tapping by hand would not be accurate enough to keep the 2 pins parallel.



Iain

[acshortt5]

If the brakes were fine before the work then IMO I don't think YOU need to do anything other than to take it back to the garage (ideally have it transported bearing in mind the current condition) as I think they have handed over the car in a dangerous condition and I think the garage should be rectifying it. If they refuse to fix it or offer to pay for the required repair then I think a call to trading standards would be appropriate.

Personally I can't believe a garage would hand back a car with just the anti rattle spring holding a caliper on.

Of course another solution would be to obtain a replacement carrier which are available - skandix have them in stock: http://www.skandix.de/en/spare-parts...02-mm/1029834/
but might be cheaper from elsewhere or cheaper for a good secondhand one.