Toyota Pickup Min. Front Rotor Thickness?

I know plenty of you folks here work on cars all day so I figure I'd ask here as I'm not finding the answer I'd like.

I have a 1994 Toyota pickup standard cab, 2wd. It looks like the rotors have seen better days and measuring with the ridge I'm getting 19.5mm so I figure probably 1-2mm thinner with the ridge, I don't have one of them fancy brake calipers. I went to wheel works and the guy told me the factory service limit is 23.5mm which point to a pretty worn rotor, but when I look online it looks like the Brembo rotors are 22.1mm min thickness out of the box I think. Now I'm thoroughly confused as the owners manual lists the pad wear limit at 1mm and the lining wear limit at 1mm. What is the difference between the pad wear limit and lining wear limit?

Anyone here know for sure the minimum rotor thickness for a punky funky picker upper trucker?

It should be cast into the inside of the rotor.

Per here 21mm for that rotor. Centric catalog frequently has minimum specs. There might be a second rotor option for this truck with different calipers.

there are 2 for 2wd Toyota trucks... one is commercial duty the other standard. For 1994 - commerical duty should be 23mm, standard duty 18mm

http://www.acdelco.com.au/PDFs/Catalogue_ACDelco_Rotors.pdf

Hmmmmm double checked another source....

http://www.autopartsource.com/catalog/2310_rev_A.pdf

minimums listed there are 23 and 20

Didn't like any of those... found this - http://www.ncttora.com/fsm/1993/index.html listed inside is the FSM for the 1993 model.... closest I could find

Thanks for all the help I think I'll be replacing the pads, rotors, rubber brake lines, and wheel seals. I will also repack the front bearing with high temp grease. I would have been able to find the min specs on the rotor but they have 240k miles and 18 years on them.

Thanks for all the help folks, funny thing is depending on where you find your info you get a different answer, I figure if the rotor is down to 18mm it is probably done.

Thanks for the link to the service manual Oldskew, I might need it.

Lining wear limit is the brake shoe wear limit for the drums in the rear.

I'm with Woody on this, the rotor manufacturer should have cast it into the rotor. I'd say that this information supercedes all other sources.

I looked for some info on the rotor but I don't see anything. It looks that to get at the information as to min thickness I'd have to pull the caliper off. Honestly I'd have to get the rotors turned anyway so figure it might be cheap insurance to replace the rotors. I'm thinking that one of the calipers might be dragging which would explain how one brake pad is worn down to the wear bars.

I'll keep y'all posted as to what the number is as it sure ain't easy to find!

look at rotors on NAPA's website. they list discard thickness among the details.

Keith Tanner wrote: I'm with Woody on this, the rotor manufacturer should have cast it into the rotor. I'd say that this information supercedes all other sources.

I wouldn't necessarily agree. This is definitely helpful, but I don't consider it gospel. For example, if the rotor said 13mm, but the caliper was manufactured to not go beyond 19mm (when factoring for worn pads, etc.) then you'll have a piston extend past the bore and cause further damage. Best to reference the factory spec if there's doubt.

Bryce

To hell with it I'm going to do the front brakes with the calipers and rubber lines and be done with it. I'd like to be able to stop if I have to. Actually have never locked the brakes on the truck, the mercedes is another story.

Thanks for all the help!

Nashco wrote:

Keith Tanner wrote: I'm with Woody on this, the rotor manufacturer should have cast it into the rotor. I'd say that this information supercedes all other sources.

I wouldn't necessarily agree. This is definitely helpful, but I don't consider it gospel. For example, if the rotor said 13mm, but the caliper was manufactured to not go beyond 19mm (when factoring for worn pads, etc.) then you'll have a piston extend past the bore and cause further damage. Best to reference the factory spec if there's doubt. Bryce

I am assuming the correct rotor is on the car, of course. There might be a bit of difference (18 vs 19mm, for example) but nothing as dramatic as your example. That's closer to a solid rotors being installed in place of a vented one. If the difference is a mm or two, I'd go with the rotor manufacturer.

New rotors are like basically free, so why bother?

Ok toyota was nice enough to put the rotor min thickness on the back of the rotor which requires you to remove the hub and unbolt the rotor, great design! Well the new rotors were marked Min 21mm, the old ones were marked 21mm min, so in conclusion the min thickness for a 1994 toyota pickup standard cab 2wd base model is 21mm.

Put new greas seals and repacked the inner and outer bearing, not sure how I was suppossed to do the preload on the bearing so I eyeballed what it felt like when I took the bearings out.

Thanks for all the help, I'm going to go bed the pads so if you guys don't hear back from me just listen to a news report of toyota pickup runaway acceleration with no brakes.

belteshazzar wrote: look at rotors on NAPA's website. they list discard thickness among the details.