theedge

Is it true that cross drilled or slotted rotors will improve braking in the soaking wet somewhat?

Coming out of puddles, then the person in front stopping suddenly, leading to a few very close almost rear enders, has me asking this question. Im coming up to replacing all the rotors (prolly later in the spring, with new pads) so thats why im asking. Its quite terrifying trying to stop and feeling like im on ice for a second or two or three, yet im out of the puddle and at a very low speed...

Danno

What kind of pads are you using? I haven't ever noticed a reduction in braking force after fjording rivers...

theedge

Metal Masters all around.

What about just as youre coming out of the puddle?

Sam Lin

Slotting will help a little.

Sam

The DareDevil

"Fording" rivers...

(In the 944?)

hoffman912

if you want better breaking in rain, get tires suited for wet traction. the biggest problem with rain braking isnt the braking part.. its the traction, or lack of on the tires that prevents it from stopping.. ie hydroplaining.

Serge944

Ditto. Most people dont realize that for street driving, the brakes themselves dont play that large of a role. Any car without ABS can lock its tires up. This means the brakes are powerful enough. The key is to NOT lock up for as long as possible as the braking force increases.

Tires are the best investment you can make in your car.

Macfreak007

Hoosier dirt stockers are AMAZING in the wet on the track....

the tiny holes or slots of a crossdrilled/slotted rotor will do nothing for you, in the wet, and in my opinion in the dry. Stick with plain old stock!

theedge

Im pretty sure the tires are managing, because just driving down the road braking is fine (for in the rain) but if I go through a big puddle it will feel like im on ice, even a distance AFTER the puddle AFTER im well through it...

I even had trouble a good 10 seconds after going through a fairly minor puddle, going uphill. The hill was after the puddle... And that happened a few times, where the braking would feel icelike a while after a puddle, so thats why im leaning towards the brakes rather than tires...

theedge

One of the ones I went through was about 18" or two feet deep... I had no choice, traffic was packed in front, behind and going the other way, on a narrow road with the sides flooding

hoffman912

you feel like your on ice, because your hydroplaining.. same effect.. no traction and you slide.. hydroplaining is the same feeling as if you were on a sheet of ice.

Peckster

Probably. Slow down, the brakes are not the problem.

Laust Pedersen

Water on cold rotors will feel like the brakes are gone for a moment, until the scraping and heat has removed/evaporated the water. It is probably true, that the drilled rotors can hold more water.

I read somewhere that Mercedes’ Maybach has a feature that keeps its rotors hot by occasionally applying the brakes and compensate with the throttle.
You could emulate that feature manually with your left foot occasionally on the brakes. I have tried that in the rain and it actually works.

Laust

theedge

Slow down from a few KM and hour if that? Oooooook...