4H Improves Breaking?

Sahara

New Member
Original poster
Joined
Jan 22, 2021
Messages
1
Location
Ontario Canada
First post on the wrangler TJ forum! I recently got my second wrangler. A 2001 Sahara in green and tan with 100,000 kms/62,000 miles. It took me months to find one with no rust where we use winter salt. Anyway it was never really winter driven, rigorously oil sprayed and everything is rustless, even looked and felt inside the lowest frame spots and all original paint everywhere even inside the frame... Even the original drum break lines just come apart no problem... I plan on not winter driving it to keep it that way.
Anyway I got it certified and the rear drum breaks needed some new parts. After the safety and even before I noticed on slippery snow only the front breaks make skid marks. I found this very odd. After calling the same shop that did everything to bring it to code they suggested using 4H. I was like “what, 4wd doesn’t affect breaking?” Anyway I threw it into 4H and holy cow all four wheels skid (Slow driveway speeds). At a bit faster speed the ABS kicks in but it’s generally the same... I know about 80% breaking comes from the front disks but how come only the front wheels skid in two wheel and all four skid in 4H. Breaking is far more controlled in slippery conditions in 4H and I have photos of it in my snowy driveway showing this unusual skid anomaly. Can anyone explain this and has anyone else experienced this? Last year my first wrangler a 2000 with no ABS slid into the car in front of me when the roads were wet, resulting in a total loss of the Jeep. Did not having it in 4H in mildly wet conditions affect my breaking distance?

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4WD connects the front axle to the rear axle and wants them to go the same speed, when one stops the other stops too.

Back in the early 80s a friend of mine had a very rusted out Scout II with little to no back brakes. He was the pilot and I was the co-pilot. My main job was cramming that thing into 4wd for any quick stop whenever the road wasn't dry. That worked surprisingly well the whole first winter and whenever it rained the next few months he had it.