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-   -   Drum brake mod? (http://www.wranglerforum.com/f282/drum-brake-mod-20354.html)

MoSo 08-01-2008 11:56 AM

Drum brake mod?
 
Is there a common swap that would replace the rear drum brakes with discs on a 98 Sport? I don't particularly want to have to replace everything in the rear end to do it, I'd just like better brakes.

slf41002 08-01-2008 12:01 PM

Yes you can use the backing plate,rotors,calipers and hoses from I think 99-02 Jeep Cherokee.I could be wrong on the years here but any Jeep cherokee that has rear disk brakes will work i think.So off to the bone yard.

MoSo 08-01-2008 12:13 PM

Do you have to swap out the master cylinder? What does the swap do to the brake bias?

nicolas-eric 08-01-2008 01:04 PM

Does that also work on a D44 rear axle?

jeepcop1 08-01-2008 02:26 PM

I've got an 01 sport with D35c. Is it just a direct swap or is there some modification needed to make it work? I can't stand my rear drums!

erickpl 08-01-2008 02:42 PM

http://www.links4jeeps.com/writeups/d35discconversion/

IslandTJ 08-01-2008 02:48 PM

Quote:

Originally Posted by MoSo (Post 251252)
Is there a common swap that would replace the rear drum brakes with discs on a 98 Sport? I don't particularly want to have to replace everything in the rear end to do it, I'd just like better brakes.

TeraFlex Rear Disc Brake Conversion Kits is a $550 solution. IMO, the rear disc conversion is not the optimal solution for increased braking strength. I would focus on improving the front brakes' performance. The best solution out is Vanco Power Brakes.

jeepcop1 08-01-2008 02:49 PM

Quote:

Originally Posted by erickpl (Post 251316)

You rock! As soon as I can find the brakes the conversion will be going on!

erickpl 08-01-2008 04:36 PM

Quote:

Originally Posted by IslandTJ (Post 251318)
TeraFlex Rear Disc Brake Conversion Kits is a $550 solution. IMO, the rear disc conversion is not the optimal solution for increased braking strength. I would focus on improving the front brakes' performance. The best solution out is Vanco Power Brakes.

Agreed on the Vanco. But the disk brake upgrade is a nice solution for those D35's w/o the C-clip. The brakes will provide a way to keep the shaft in the tube should it get snapped. Plus maintenance is a bit easier - though not necessary nearly as often on the back as it is for the front.

slf41002 08-05-2008 07:19 PM

Quote:

Originally Posted by nicolas-eric (Post 251275)
Does that also work on a D44 rear axle?

I think it is the same for the D44 as for the D35 although I read that you have to fab up a spacer of some sort on one application but I think it was for the non c clip type rearends.I have this as my soon to do upgrades but not in the next few weeks so I will put up a couple links to look at.The first one is a real good info site for a lot of mods and upgrades
http://www.stu-offroad.com/suspension/d35disc/d35-1.htm
http://www.jeeps-offroad.com/articles/waggy44brakes.php

Jerry Bransford 08-05-2008 07:53 PM

If you decide to go ahead with the conversion, just realize that while it will make maintenance a lot easier, you won't gain any braking performance. In other words, if your present rear drums are working properly, you won't see any better braking or shorter stopping distances after converting to rear disks. On the rear, drums are actually a very good choice so long as you don't get into mud.

I've done the rear drum to disk conversion for other reasons and can verify that I obtained the expected zero braking improvement. None, nada.

To improve your braking, work on the front brakes where 80-90% of all the braking force comes from. Slotted/drilled/dimpled rotors won't help. Some pads like the EBC Yellow Pads will help, but if you need/want dramatically better braking, about the only way to get it is with Vanco's Big Brake kit. It replaces the single-piston calipers with dual piston calipers, plus it replaces the knuckles that flex under hard braking with reinforced knuckles that help the calipers stay where they should under hard braking.

After going to 35" tires, my braking was very marginal (upgraded front brake pads, all cast ventilated rotors, rear disks)... enough that it worried me. Since installing the Vanco kit, I can lock up my front brakes if I need to they're that good. :punk:

slf41002 08-05-2008 09:16 PM

Yeah Jerry I have talked to a couple other people that said they were expecting a lot better brakeing distance and could barely tell a difference afterwards.I just personally do not like drum brakes.That and any brakeing improvement (even the smallest amount)would be welcome when pulling a trailer.Also I know of a totaled 99 grand cherokee so the parts will be almost free.So I figure I may as well!!!!;)

slf41002 08-05-2008 09:18 PM

I have looked at the Vanco setup also but not feasible right now!!!!

Jerry Bransford 08-05-2008 09:45 PM

Quote:

Originally Posted by slf41002 (Post 252533)
I have looked at the Vanco setup also but not feasible right now!!!!

Yeah I know it's not cheap but it's sure a great solution to the braking problem a Jeep has once you get big tires installed. Start saving your pennies. :p

slf41002 08-05-2008 10:02 PM

Pennies I would be a while with quarters or half dollars cause the dollars my kids or my Jeep one already has them all:D It is a nice setup and for those new out there or have not seen the Vanco setup here are a few links.
http://www.cascade4wd.com/Projects/J...akeInstall.htm
http://www.vancopbs.com/product_p/dkj1000.htm
http://www.stu-offroad.com/suspensio...bigbrake-1.htm

slf41002 08-05-2008 10:14 PM

Hey Jerry I have a question!!! Do you have to use the Hydroboost brake booster with the Vanco brake setup?Cause then you probably have to get a higher volume/pressure power steering pump???If this is the case you could have up to 2 grand in your front brakes alone!!! WOW

debruins 08-06-2008 07:47 AM

ive found that i lock my stock brakes up when braking with my BFG M/T's i think they just skid wicked easily, so remember even if your brakes are super strong and it doesn't help if they just lock up and you skid, what ive found is my brakes are more than adequate and i would personally spend the money on getting two sets of tires one for on road handling and one for off road

erickpl 08-06-2008 08:25 AM

Quote:

Originally Posted by slf41002 (Post 252532)
Yeah Jerry I have talked to a couple other people that said they were expecting a lot better brakeing distance and could barely tell a difference afterwards.I just personally do not like drum brakes.That and any brakeing improvement (even the smallest amount)would be welcome when pulling a trailer.Also I know of a totaled 99 grand cherokee so the parts will be almost free.So I figure I may as well!!!!;)

You may want to make sure the 99 GC's parts are compatible. The 99 GC is a WJ, not a ZJ, so you may have issues making everything fit.

Jerry Bransford 08-06-2008 11:11 AM

Quote:

Originally Posted by slf41002 (Post 252556)
Hey Jerry I have a question!!! Do you have to use the Hydroboost brake booster with the Vanco brake setup?Cause then you probably have to get a higher volume/pressure power steering pump???If this is the case you could have up to 2 grand in your front brakes alone!!! WOW

No Hydroboost brake booster is needed at all for the Vanco kit. The OE brake system actually puts out plenty of brake fluid pressure as is and it's way more than enough to achieve very good braking. I'm still running the OE power brake booster with my Vanco kit and I wouldn't really gain anything except a slightly reduced pedal effort to achieve the same braking distances.

The OE power brake system can actually provide more power than the OE brake calipers, pads, and pistons can handle so they all warp slightly under the pressure. That's the biggest problem with the OE brakes and big tires, the fact the pads don't maintain good contact with the rotors under hard braking because of that warping/twisting. That's why the Vanco kit went to a dual piston caliper to spread the force over a larger area of the brake pads, and a stiffened/strengthened caliper assembly to prevent it from bending/twisting during hard braking. That's how the Vanco kit gets its added braking force, by utilizing the OE brake fluid's already sufficient pressure more effectively. :)

mbrown55 01-13-2009 04:21 PM

braking in reverse
 
i do a lot of backing down steep inclines to launch jet skis with my YJ and it seems to reason that when in reverse the back brakes become the front and better braking could be expected with a rear conversion to disc. any thoughts?

Jerry Bransford 01-13-2009 04:41 PM

At the slow speed used to back a boat/jetski trailer down a launching ramp, having disks in the rear isn't going to help much at all, if any. The reason the front brakes do so much more braking in the forward direction is because of weight transfer that is much greater at normal driving speeds which just isn't there when on a boat ramp.

Having owned a half-dozen boats and a jetski over the years, I know of the braking issues you can have on a launching ramp, not to mention the algae/moss making it even slicker. But I wouldn't convert the rear to disk primarily in hopes of better launching ramp braking. :)

rrich 01-13-2009 05:20 PM

Sometimes we shoot ourselves in the foot before we even start.

If you have "Lifetime" linings or the supposedly "good" linings, they may just be too hard. They make them super hard to last that lifetime, but they don't stop very well.

Try the cheapie linings and pads, they are soft, they grip, THEY STOP! They'll last almost as long as the "good" junk too. You may be happy with it without expensive mods.

Seems that brake mfgrs have forgotten that brakes are a friction device.

Giancarlo 01-13-2009 05:27 PM

Quote:

All I can say is that after installing this kit, I was absolutely grinning from ear-to-ear and stunned on how dramatically my Wrangler's braking performance had improved. I can now actually lock up my front brakes with 35" Goodyear MT/R tires, something I couldn't have even come CLOSE to before. I didn't measure braking distances before and after but based on what my brakes couldn't do before and now can do easily, the braking improvement is dramatic. Anytime you can lock up your brakes with 35" tires with only moderate brake pedal pressure, you've found the Holy Grail of Jeep braking. And yes, the front brakes lock up before the rears do as they should for good controllability


Jerry Bransford

i found ur post jerry haha

chesterspl 01-13-2009 06:01 PM

Most of your braking is done with the front wheels, something like 70%. Just get some beefed'(slotted,crossed drilled whatever tickles your fancy) up front rotors and run premium pads and you will notice way more improvement than putting disc on the back.

slf41002 01-13-2009 10:05 PM

That is not really all that,,well it is just false.Slotted and cross drilled rotors will do nothing for basic driving.You are better off with an OE style rotor and softer compound pads than with Euro style rotors and hard metalic pads.Not calling you out or anything just stating a fact that I am sure will be backed by many more on here.

Jerry Bransford 01-13-2009 11:04 PM

Quote:

Originally Posted by chesterspl (Post 307773)
Most of your braking is done with the front wheels, something like 70%. Just get some beefed'(slotted,crossed drilled whatever tickles your fancy) up front rotors and run premium pads and you will notice way more improvement than putting disc on the back.

Actually, cross-drilled, slotted, and dimpled rotors have less swept area and surprisingly, they usually increase braking distances, not decrease them... regardless of what the hype says. Plus slots tend to wear pads much faster. But if you think about it, any time you drill holes, cut slots, or machine dimples into a rotor, you're reducing its swept surface area so the pads don't have as much to grab onto.

They were originally designed to help with a problem called "off-gassing" where earlier pad formulations would emit gas when they got red hot during racing. The drilled holes and slots would help get rid of the gasses for better braking. Newer pad formulations don't off-gas so the few racers use such rotors any more.

You're really better off, where a Jeep is concerned at least, with an all cast vented rotor like a Centric Premium. Combined with EBC Yellow Pads, the braking with that combination will be so good it will be scary until you get used to it. :)

chesterspl 01-14-2009 02:37 PM

I agree with you guys I was just kindof talking quick and not really explaining, to many thoughts and my fingers won't move fast enough. I just think with better pads and better rotors, may it just be new OEM or whatever the case that it would make great improvement. I don't think changing the rears to rotors is cost effective

bkelly911 12-29-2011 10:41 AM

My jeep stops fine... I just want my parking brake to actually work and I want it to be easier to change the pads! I hate doing drums!!


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