Brake ID?

[JayDarden]

I have pulled my wheels to bleed / replace pads, my calipers are marked "atc" in cursive followed by "28" on the rear and "atc G6" on the front.

Any idea what these are from and can I get pads?

Now that F1 is on speed again I have something to watch, so this project can take it's time . . .

[JayDarden]

Uh, check that. ATE not ATC (I think). Guess I should clean under here once a decade.

[Dave at Pelican Parts]

Solid rotors or vented? If they're solid, chances are that they're stock brakes.

Do the rears have levers on them for the handbrake cables? If so they are likely stock.

--DD

[JayDarden]

Dave - solid rotors, Rears both have a cable for e-brake but they are just zip tied off so I don't know if they are functional. They may just be part of the 911 control arms that supports the rear. (strange setup)

Rear rotor surface measures apx 1 7/8 inch, apx 11" overall.
Has LU 4459 911.352.041 08 MIN TH 0,890 INCH MAX DIA 7,126"
stamped on the hubs.

The fronts measure apx 2 3/8 inch, apx 11 inch overall.

Should I pull the pads and measure? Or would sending pictures help ID?

How much fluid should I order for a really good flushing?

I hate having to return stuff so I would like to work this out in advance.
thanks, Jay

[Dave at Pelican Parts]

It sounds like you're describing stock rear calipers and rotors. I can't quite tell if you're saying that the rears have a lever on the bottom or not, but if so then they pretty much are stock ones.

Hmm, this isn't as good a picture as I had hoped for...


The kind of "bump" on the bottom right of the caliper in the above picture should have a lever on it that swings fore and aft. That is the actuator for the handbrake, and both the -4 and the -6 calipers have it.

The -4 calipers are much, much more common than the -6 ones.

It took me just over a 1-liter can of brake fluid to flush the brake system, but I may have been a little over-generous with it.

--DD

[JayDarden]

Thanks for the help. I am trying to post a picture . . . here goes:






What kind of pad do you suggest for a high hp car? I don't care about dust. Quick stops are more important to me, and I have very large tires.

[JayDarden]

3 feet 7 inches of rubber:

[Dave at Pelican Parts]

Those are not stock 914 rear calipers. They do not have the plugs in the sides for adjusting the venting clearance. They could be 914 front calipers (I think that's kind of likely). I can't go look at my car right now--it's at home--so I can't check the numbers on the casting.

The fronts, BTW, look like regular 911 front brakes. Moving the -4 front brakes to the rear is not an uncommon thing to do when upgrading to 911 fronts. (Check the caliper bolt spacing, 3" is the 'M' caliper; 3.5" is either 'S' or 'A'; 'S' is aluminum and a magnet won't stick.) Get the size pads for the appropriate 911 brakes.

As for what kind of pads to get, Porterfield "street" pads are one of the best. They work when cold, unlike the "race" pads which don't work at all in the first few corners until you get them up to temps. They help resist fade, and they seem to have a high coefficient of friction.

--DD

[JayDarden]

What bolts do I measure? I have two on the top and two on the bottom, about a inch and a half apart - then 4 inches apart between the groups of two. (closest bolts).

The rears have the same grouping with only 3 1/4" between the top two and bottom two.

Sorry for the constant q's but I want to get it right before ordering. (from Pelican)

[Dave at Pelican Parts]

The bolts are the ones that hold the caliper onto the mounting ears on the strut (front) or trailing-arm (rear).

BTW, the pic of the rear looks to have a 911 spring plate, yes?

The distance quoted (3" or 3.5") is center-to-center of the bolts.

--DD

[JayDarden]

The Fronts are 3 1/2 inch bolt to bolt.
The Rears are 3 inches bolt to bolt.

Yes, the rear has 911 spring plates, control arms, and shocks.

What do you think I should order for pads?

[Dave at Pelican Parts]

OK, now get your magnet. If it sticks to the front calipers, you have "A" calipers. If not, you have "S" calipers.

http://www.pelicanparts.com/catalog/shopcart/911M/POR_911M_brakes_pg5.htm#item20

They do take different pads.

I am not sure about the rear pads. There are two different part numbers (one matches the "A" caliper pad number, one is a different revision of the "M" caliper pad number). I would take a guess at the "M" caliper one, "-02R". I would probably pick up a set of stock pads just to see if they fit correctly. If they do, then get the Porterfield "street" pads for the appropriate 911 brakes.

--DD