|
|
 Re: rear disc brakes
[Re: BigJim]
#874322
03/11/08 05:48 PM
|
Joined: Jan 2000
Posts: 1,817
Body Damage is Cool
|
BJ, you missed the point IMO regarding offroad Jeep Wranglers: see Superdawg's post above ...
"Next is the one that the hardcore guys figured out, backing down extreme obstacles, like potato salad hill MOAB. Rear disc brakes don't loose any stopping power in reverse.
Drums do, they have a primary/secondary shoe system that is designed to work going forward, the way they work going backwards is greatly reduced."
I can verify point made by Josh, I've had several experiences where I nearly lost the 94 Wrangler attempting to stop on a steep shelfroad or monolithic rock due to the drum brakes not holding in my early days wheeling the near stock Wrangler in the Rockies.
94 YJ, SOA, 2-1/2 Alcans, ARB-front, Detroit-Rear, 4.56:1 gears, Oasis Trailhead compressor, 4:1 Terra Lo, 37x12.50x15 SSR's, 8000 lb Ramsey, & etc.
|
|
|
Re: rear disc brakes
[Re: el_d_m]
#874324
03/12/08 05:40 PM
|
Joined: Oct 1999
Posts: 2,211
Body Damage is Cool
|
One important factor in deciding to do rear discs is if your OE brakes are shot, I mean done.
New wheel cyls, Drums, hardware kits, shoes..that covers a good 1/2 or more of doing discs.
I figure discs into all custom axles that I build.
Why screw around with Drums?
SD
|
|
|
Re: rear disc brakes
[Re: el_d_m]
#874325
03/12/08 07:59 PM
|
Joined: Jun 2005
Posts: 1,038
Body Damage is Cool
|
Jeep Wrangler stopping distance
1997 Wrangler 184 feet (rear drums)
2003 Wrangler 167.4 feet (rear disc)
2007 Wrangler (4 door) 148 feet (rear disc, larger front disc)
I can tell you first hand my Cherokee with rear drums and ABS wasn't stable at all under hard braking. The rear would fishtail and the nose would dive hard making steering near impossible.
The JK is much better. Less pedal pressure is needed and it stops much quicker.
I have to say from the drivers seat rear disc brakes, computer braking assist and larger front discs make a huge difference in stopping distance and stability.
Performance 1997 Jeep Wrangler From MSN review
Jeep Wrangler SE hardtop - 4L 2.5L (120 hp) 5M (no ABS)
(seconds) 0 - 60 Time 12.62
(seconds) 1/4 Mile Time 18.98
(mph) 1/4 Mile Speed 72.40 mph
Braking 60 - 0 184 (ft.)
From Edmunds review of the 2003 Wrangler Rubicon.
Vehicle Tested:
2003 Jeep Wrangler Rubicon 4WD 2dr Convertible SUV (4.0L 6cyl 5M)
MSRP of Test Vehicle: $27,760.
"The standard four-wheel ABS-equipped brakes provide decent feel, but with a stopping distance of 164.7 feet from 60 mph, don't expect to stop on a dime in this vehicle."
2007 Jeep Wrangler Unlimited (4 door) From Motortrend review.
Base price $29,500
Price as tested $34,550
Vehicle layout Front engine, 4WD, 5-pass, 4-door SUV
Engine 3.8L/202-hp/237-lb-ft OHV 12-valve V-6
Transmissions 4-speed automatic
Curb weight 4592 lb (51/49%)
Wheelbase 109.3 in
Length x width x height 173.4 x 73.9 x 70.9 in
0-60 mph 10.0 sec
Quarter mile 17.3 sec @ 76.8 mph
Braking, 60-0mph 148 ft
EPA city/hwy fuel econ 16/19 mpg
CO2 emissions 1.1 lb/mile
Total mileage 2245 mi
Average test mpg 15.2 mpg
Unresolved problem area None
|
|
|
Re: rear disc brakes
[Re: Seattlegti]
#874326
03/12/08 08:19 PM
|
Joined: Oct 2003
Posts: 7,768
Web Wheeler
|
Jeep Wrangler stopping distance
1997 Wrangler 184 feet (rear drums)
2003 Wrangler 167.4 feet (rear disc)
2007 Wrangler (4 door) 148 feet (rear disc, larger front disc)
I can tell you first hand my Cherokee with rear drums and ABS wasn't stable at all under hard braking. The rear would fishtail and the nose would dive hard making steering near impossible.
The JK is much better. Less pedal pressure is needed and it stops much quicker.
I have to say from the drivers seat rear disc brakes, computer braking assist and larger front discs make a huge difference in stopping distance and stability.
Performance 1997 Jeep Wrangler From MSN review
Jeep Wrangler SE hardtop - 4L 2.5L (120 hp) 5M (no ABS)
(seconds) 0 - 60 Time 12.62
(seconds) 1/4 Mile Time 18.98
(mph) 1/4 Mile Speed 72.40 mph
Braking 60 - 0 184 (ft.)
From Edmunds review of the 2003 Wrangler Rubicon.
Vehicle Tested:
2003 Jeep Wrangler Rubicon 4WD 2dr Convertible SUV (4.0L 6cyl 5M)
MSRP of Test Vehicle: $27,760.
"The standard four-wheel ABS-equipped brakes provide decent feel, but with a stopping distance of 164.7 feet from 60 mph, don't expect to stop on a dime in this vehicle."
2007 Jeep Wrangler Unlimited (4 door) From Motortrend review.
Base price $29,500
Price as tested $34,550
Vehicle layout Front engine, 4WD, 5-pass, 4-door SUV
Engine 3.8L/202-hp/237-lb-ft OHV 12-valve V-6
Transmissions 4-speed automatic
Curb weight 4592 lb (51/49%)
Wheelbase 109.3 in
Length x width x height 173.4 x 73.9 x 70.9 in
0-60 mph 10.0 sec
Quarter mile 17.3 sec @ 76.8 mph
Braking, 60-0mph 148 ft
EPA city/hwy fuel econ 16/19 mpg
CO2 emissions 1.1 lb/mile
Total mileage 2245 mi
Average test mpg 15.2 mpg
Unresolved problem area None Modern tires and abs account for the bulk if not all of the difference. Although not listed them are on the Jeeps as well. Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
|
|
|
Re: rear disc brakes
[Re: BigJim]
#874327
03/14/08 02:51 PM
|
Joined: Oct 1999
Posts: 2,211
Body Damage is Cool
|
Jim, discs are better, they stop straighter, work better wet, take less maintenance, cost less once on, stay cooler...The list goes on....why defend drum brakes with lame reasons like the tires are more modern? It is simple, if you need brakes anyway and you would like an upgrade Discs are it...simple.
SD
|
|
|
Re: rear disc brakes
[Re: superdawg]
#874328
03/14/08 03:57 PM
|
Joined: Oct 2003
Posts: 7,768
Web Wheeler
|
Supe I'd rather have the discs, for all the reasons you list and maybe others too. My position is that if one needs new shoes on the back end and intends to spend 800/$1,000. to put discs back there he should KNOW the Jeep ain't gonna be a new one when he gets finished with the modification. For that same $1,000. a guy can get a winch, new tires and wheels or a whole lot of other things that would benefit the Jeep more than a disc modification. Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />
professional bovine relocation specialist
|
|
|
Re: rear disc brakes
[Re: BigJim]
#874329
03/14/08 05:26 PM
|
Joined: Oct 1999
Posts: 2,211
Body Damage is Cool
|
TSM $299 and you supply your own calipers and lines.
SVO (explorer) but with the preload spacers, and calipers/pads,...$750.
If you know what to do and what to look for Wrecking yard, parts with new/reman calipers/pads...$200-300 max.
Weld on caliper brackets $40 a pair, rotors, calipers...put a kit together...$200-300 max.
Drums, wheel cyls, shoes and hardware...on the cheap end..
$200.
SD
|
|
|
|
