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post #1 of 15 (permalink) Old 05-31-04, 05:12 PM Thread Starter
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do discs have to be machined when changing pads?

i was under the assumption that machining the discs could only be determined upon inspection but the guy i got a quote from said that if you don't machine them when u change the pads u may get unnecessary noise/vibration and some other hooha.

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post #2 of 15 (permalink) Old 05-31-04, 06:32 PM
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Re: do discs have to be machined when changing pads?

crap.. usually one machine to 3 sets of pads.... in theory its good practise to be safe but the variables on disc wear are numerous
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post #3 of 15 (permalink) Old 05-31-04, 06:49 PM
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Re: do discs have to be machined when changing pads?

Quote:
Originally Posted by tibbo
crap.. usually one machine to 3 sets of pads.... in theory its good practise to be safe but the variables on disc wear are numerous
I agree 100%. I only get mine machined every 3rd or 4th pad change (pads only last about 40,000kms max) or if the discs have been damaged from metal on metal or similar. Just be aware when you change pads they will take a while to bed in so you stopping power will be significantly less for a while.


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post #4 of 15 (permalink) Old 05-31-04, 07:10 PM
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Re: do discs have to be machined when changing pads?

what everyone else said. if you machine them everytime then the discs arent gonna last long either.

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post #5 of 15 (permalink) Old 06-01-04, 03:08 AM
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Re: do discs have to be machined when changing pads?

i agree with all the above but just keep in mind ef to ba rotors are made from shit collected from the floor of the engine casting room my ef were undersize at 50'000k the ba were warped at 18'000k or maybe they do need maching if in doubt get a 2nd opinion cheers
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post #6 of 15 (permalink) Old 06-01-04, 03:18 AM
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Re: do discs have to be machined when changing pads?

The determinant should always be lateral runout and the presence of excess wear grooves in the disc face - there is no arbitary method that is effective such as every 3rd set of pads and to not have those tolerances (including rotor thickness) taken is to invite trouble.

This is especially the case with late model Ford rotors as they bear an uncanny resemblance to butter in terms of material hardness and can wear below minimum thickness very quickly.

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post #7 of 15 (permalink) Old 06-01-04, 05:58 AM
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Re: do discs have to be machined when changing pads?

basically it would depend on pedal feel if you get a vibration or pulsing through the pedal under braking then yes machine the pads or as mentioned if you have had metal to metal contact on the rotor
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post #8 of 15 (permalink) Old 06-02-04, 12:53 AM Thread Starter
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Re: do discs have to be machined when changing pads?

thanks. i talked to the guy and he said it's his rule to always machine the rotors cuz too often he gets people coming back and complaining about all of the above when he doesn't.

i got quoted $370 for general service (lube, oil, etc) and for all brake pads changed to bendix's, not ultimates though. if they need to be machined though it'll set me back $620. does that sound reasonable?

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post #9 of 15 (permalink) Old 06-02-04, 01:34 AM
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Re: do discs have to be machined when changing pads?

nope,, alittle over the odds i'd say.. i can get the DBA rotors for $66 (trade) thru Repco so the $62.50 each he is charging you to machine each one is expensive
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post #10 of 15 (permalink) Old 06-02-04, 01:37 AM
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Re: do discs have to be machined when changing pads?

Whoa it's insane to machine rotors every time you change pads. You'll need new rotors every couple of years.
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