Brake Wear Front Vs Rear

[Tcrate]

I am a new owner of a 1987 911 Targa (since November of last year). I track this car mostly and the previous owner put 2000 Boxster calipers and proportioning valve on this car. I am running Hawk Blue pads right now and just replaced the fronts. The rears have 8-10 mm of pad left and will probably need replaced soon. 6mm is kind of my limit at this point. I am curious what the wear pattern is front to back on a typical 911. Do the front pads wear quicker than the rears or vice versa or is the wear even. I am used to front engine vehicles where the fronts typically go much faster than the rears. Looking for input on what you are experiencing.

Thanks.

Tom

[moneymanager]

Fronts do most of the work, no matter where the engine is. Expect to replace the fronts 2-4 times for every change at the rear.

[Trackrash]

Originally Posted by moneymanager

Fronts do most of the work, no matter where the engine is. Expect to replace the fronts 2-4 times for every change at the rear.

That has been my experience as well.

[Cajundaddy]

Tire choices matter as well. A car running square will eat up front brakes much faster than a staggered setup.

[Tcrate]

Thanks for the input I am running Nitto N01 but we'll see what happens

[Bill Verburg]

Originally Posted by Tcrate

I am a new owner of a 1987 911 Targa (since November of last year). I track this car mostly and the previous owner put 2000 Boxster calipers and proportioning valve on this car. I am running Hawk Blue pads right now and just replaced the fronts. The rears have 8-10 mm of pad left and will probably need replaced soon. 6mm is kind of my limit at this point. I am curious what the wear pattern is front to back on a typical 911. Do the front pads wear quicker than the rears or vice versa or is the wear even. I am used to front engine vehicles where the fronts typically go much faster than the rears. Looking for input on what you are experiencing.

Thanks.

Tom

here's what's happening, assuming the p/v is the stock 33bar unit that comes in all 3.2 Carreras
below 33bar line pressure the f/r ratio is 1.534, this is near where you'd want to be.
above 33bar line pressure the ratio goes to 2.841, this is way too much front.

There are a couple of way to deal w/ this
1) pull the p/v, this allows the f/r ratio to stay @ 1.5 at all line pressures and is in line w/ the f/r ratio used up through '83. You also have a m/c issue w/ this setup, I'd want a 23.8mm 930 m/c. You'll get a much better track pedal. None of this addresses the additional heat that the Boxster caliper is putting into the front rotors, do add as much cooling from scoops and ducting as you can and use high temp fluid and pads, lightening the car up never hurts either.

2) pull the Boxster calipers and return the front to the stock wide A calipers. This returns the car to stock which was far from perfect but has some possibilities. stock below 33bar f/r ratio is 1.22(a bit too much rear), above is 2.260(way too much front). What some guys do is add the 23.8mm 930 m/c to this setup w/o the p/v. As long as the wheels never lock it will be fine(the 930 m/c will make it difficult but not impossible to lock them up)

3) pull the front calipers and install stock wide A's, pull the p/v, pull the rear calipers and rotors and install '69-83 rear calipers and rotors. Now you have the same setup as was used thru '83 w/ a bit better front rotor thermal capacity.