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how thick should front brake pads be?

RWD4ever

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I saw a major retailer had slotted rotors for $75 - clearance sale, so I grabbed some. I happened to have some pads lying in workshop: the cheapo SUPERSTOP brand. They were very difficult to fit. I pushed back the piston, and removed the bit of tinplate (with ISO number) that clips on. But there is only a Rizla paper clearance to get it on the new rotor. The sliding pins aren't seized, as is common with such old cars. Rotor seems to be correct thickness. The pads thickness varies from 12.5 to 12.8 mm among the four of them.So looks like some sloppy manufacturing there.
This is just the standard VS V6 brakes, not HSV, VT, VE or some other upgrade.
 

_R_J_K_

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What did you use to push the piston back in? Was it fouling on the thick side or just everywhere? The single piston slide calipers are sometimes a bit weird when you're trying to push the two halves apart, they're a bit counter-intuitive it's hard to explain. The tin plate (the shims) are for anti-rattle/vibration (?), so if it's making some strange noise that's probably why.
 

shane_3800

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As long as the rotor spins freely they should be fine. If you force the caliper on being a lazy .... you end up having to go back on the hoist and pulling it apart again just to push the pistons back 5mm.
 

greenacc

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Usually about 11mm at a guess but I have never actually measured them.
If you were really desperate you could rub them on flat concrete to remove some material but make sure you do it evenly.
 

vs-lover

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The metal plates are called "Anti Squeal Shims"
 

losh1971

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I never use the shims and never have any squealing. I think if you fit VE calipers they are needed though or you get problems.
 

shane_3800

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The shims do reduce noise. New brake pad thickness varies max thickness can be changed not by concrete but buy some 80 grit on a piece of glass or a good bench. The dust they make resizing nakes it worth just going to a good mechanic of you value your health.
 

losh1971

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Shims must come with cheap pads, the last 5 sets of pads I bought never came with shims. I've seen hi-temp RTV used on the back of pads too but I've never used this either.
 

shane_3800

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Shims must come with cheap pads, the last 5 sets of pads I bought never came with shims. I've seen hi-temp RTV used on the back of pads too but I've never used this either.
Any stuff smeared or sprayed on the pads is BS but the shims help and come on most decent pads.
 

losh1971

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come on most decent pads.
Hmmm interesting my last three sets of QFM's and last two sets of Bendix 4WD pads never came with shims. First pad change on the ute it had shims from previous owner. But I chucked them away as I haven't used shims in well over 10 years and never had a noise problem. That's why I thought it must have been something cheap pads come with.
 
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