BRAKE ISSUE WITH 135i CALIPERS

[froop]

Originally Posted by Dynamic1

My 08 135i is at 92k miles and the rotors and pads were done (although the sensor still hadn't gone off)... so I took a look at my calipers and everything was in order. I'm all about some spirited driving (3 years in Germany to boot), and I'm surprised the original pads and rotors lasted this long. Sorry I didn't get more/better pics.

Spirited driving and track driving are quite different. Unless you're threshold braking corner after corner on the street, the heat generated is going to be a lot less.

The calipers on my car are about 30,000kms old and at least 60% of the dust boots are completely shot. The pistons themselves look in fine condition though. I'm using upgraded pads, ECS 2-piece rotors, Ti shims and no dust shields. In those 30,000kms over 3 years I've done maybe 10 or so circuit days.

[Dynamic1]

Right - I get that it's different... I saw somewhere in the thread a request for comparison to high milage calipers, so I was just sharing what I saw.

[froop]

Originally Posted by Dynamic1

Right - I get that it's different... I saw somewhere in the thread a request for comparison to high milage calipers, so I was just sharing what I saw.

Ahhh ok.

Yeah I have an E88 135i with 148,000kms and the dust caps and pistons on those were fine. I've tracked it maybe 2-3 times but using stock brake pads but nothing like how I've tracked the E82. The E82 also has a lot more power and better pads so will generate a lot more heat.

[SamN]

By way of comparison, this is what a race-specific cooling plate looks like. I run these on my Spec3 race car. Notice the flange is angled slightly towards front and that air is directed to center of hub/rotor to force flow into and through cooling veins.

http://www.bimmerworld.com/BrakeCool...es_E36__WM.jpg

Better yet, e82 specific part:

http://www.bimmerworld.com/E9X-E8X-N...ate-Right.html