bluejeep2001

Doing an EBAY search for drilled only--- front rotors for my 2001...find almost nothing....a general search shows many 1999 rotors with the same rotor height...78mm-- Another car parts site lists almost all their rotors as 1999-2001 I know some had cast and some were composite don't know the years. Most of the sites I am on don't specify cast or composite...I am pretty sure the 2001 is cast... Will a 1999 fit a 2001? Thx

EEVEE

While i am looking at brake discs myself i have noticed there is different heights as well which is very annoying. There is a thread i read up on and apparently they dont make the same sizes... go figure and i have to have a 99 jeep as well and have no clue on which size i have as it looks like they changed sizes midyear. but here is the thread : http://www.jeepforum.com/forum/f11/a...e-hubs-360959/

as for the drilled i have no clue other than seeing these https://www.carid.com/stoptech/selec...kaAuY-EALw_wcB

Why do you want drilled brakes? imo the slotted brakes are better as they are more resistant to cracking from heat stress and in some cases less squealing. and also as i hear and dont quote me lol the slotted saves more brake pad too.

JK253

'99 had both cast and composite rotors as there was a switch mid-year, due to the hub design changing.

Pre and early '99 are composite, late '99 and up thru 2001 are cast. I'd take slotted over drilled due to cracking possibility, but that's just me.

investinwaffles

Please don't buy drilled rotors. If you are actually hard on your brakes (towing, mountains, etc), you will warp them and they will develop stress cracks. Even on my friends city daily driver Infiniti M35 they did

Just get Centric Premium rotors or Napa Ultra Premiums (almost identical, made by Centric), they are the best you can get for the XJ.

A better investment would be some GG friction rated pads like the Powerstop Z36, EBC Green/Yellow or Black Magic pads (the best). Stainless braided brake lines and some good DOT 4 synthetic fluid if you are serious

EEVEE

Yeah what he said. Its all in the brake pads imo, And also if you want to go further you can convert the rear drums to discs for even better braking and more even brake petal feel. But thats if you can. Also i learned this but never go below 20 bucks for brake pads that is your safe point for safe braking. I had a friend who bought 9 dollar brake pads for his jeep and the petal went straight to the floor after 2 stops as they really heated up and faded so bad. I forgot what causes that something with the organic materials or some bs but there is alot of that material and that causes them to overheat quickly and in some cases destroy your rotors. Its scary when you cant brake lol.

BlueRidgeMark

Whoa! Be careful!

You can't mix synthetic with conventional brake fluid. It's not like engine oil. You have to flush the system with a solvent if you are going to change.


FYI, the military went to synthetic brake fluid for all their vehicles in the early 80s, I think. They have since switched BACK to conventional due to problems with the synthetic. The very property that makes it seem so wonderful, that it does not absorb water, turns out to be a bad thing. Any water that gets in just sits in a low spot and rusts it out at that point. With conventional fluid it gets absorbed and doesn't cause a lot of problems.

bluejeep2001

I have been running the drilled for almost 2 years with no apparent cracking.. Theyre just worn and the pads are getting thin...just seems like I had many more options last time...I know the difference in rotor heights...if you lay them down flat like a top hat one set is a good bit taller ...will not fit...78mm is my size. I have heard that the slotted eats brake pads because each time a slot scrapes past the pad it grinds a little off so you always brake with "fresh" pad...where the drilled just offers cooling..can't prove it..just internet say-so. Its just curious that Rock auto offers dozens of rotors all 1999-2001 where the ebay rotor people offer 1 or 2 for a 2001 but dozens for a 1999. I will look into your suggestions...NOT converting to disc...not that motivated...not enough beer for that project..thanks for the help and advice

tech

Almost all brake fluid is synthetic now, and if it is dot 3 it can be mixed with all dot 3 fluids you cannot mix dot 3 with dot 4 or 5 . but the jeep brake system is made to use dot 3 . the best rotors are just grooved no drilled holes the slotted or grooved rotors are good , the slots keep the brake pads clean but they don't eat pads . I use grooved rotors on my DD I've had the brakes on for about two and haft years now and I drive 80 mile to work and back and i'm not easy on my brakes I do use a good Ceramic pad .

IJM

^^^ What he said. Though I'd also add Hawk LTS to that list of pads. I've been very happy with them and their improved bite. Plain (not slotted or drilled) rotors and performance pads is the way to go.

DOT-3 and DOT-4 brake fluid is fully compatible. They're both glycol based, and the primary difference is boiling point. DOT-4 has higher dry and wet boiling points, and I use DOT-4 in my Cherokee and other cars. Some of the high temp DOT-4 fluids like Motul RBF-600 (I use this in my track car) tend to be more hydroscopic, so you have to change it a bit more often. My advice for the OP is to pick up a liter DOT-4 fluid and do a brake flush when you change you pads and rotors next time.

I should also add that DOT-5 fluid is silicone based and not at all compatible with DOT-3/4.

nujeepguy

i dont believe this....

EEVEE

They do exist, it isn't the exact brand as his were from China about 5 years ago. but the petal did go to the floor and then faded so badly he had to change pads and the problem hasn't come back since after he changed them. I know it sounds farfetched but it was true when i tried them. No there weren't any brake leaks or anything it was the pads themselves. I just go by you get what you pay for sometimes and those pads were an example.

CurrySoSpicy

Your name makes a lot of sense now that I see that Pokémon avatar in that picture.

;-)

bluejeep2001

What are grooved rotors and GG rated pads ..Im not familiar with these terms

EEVEE

Hmm never heard of that either, looking it up i found this little post that says its the bite and resistance to fade. https://www.bimmerforums.com/forum/s...friciton-codes

and grooved rotors. I dont know if he means they are grooved from damage or maybe saying theyre slotted? im sorry i have no clue.

Nujeepguy: I wanted to mention im not trying to start an argument at all dont take what i said the wrong way. Some parts you strike gold with and others are duds. Unfortunately my friend got duds, gotta take chances sometimes lol.

Currysospicy: Thanks! i love pokemon lol. I always stick a pikachu on my dash, even tho its sunfaded to the point it falls apart. But he has been to alot of states since being made in 1999 so he is as old as my jeep lol and been to 32 states so far.