Jeep Wrangler Forum

Jeep Wrangler Forum (http://www.wranglerforum.com/)
-   TJ Tech Forum (http://www.wranglerforum.com/f210/)
-   -   Off Road Brake problem. (http://www.wranglerforum.com/f210/off-road-brake-problem-264008.html)

Gunner 08-19-2013 09:01 PM

Off Road Brake problem.
 
OK here's my situation. First I have talked with Blaine about my brakes on the street. It stop's great. And if I hit them hard it will howl the tires. But what I am having a problem with is in 4 low with the 4 to 1 box, I routinely have trouble holding sufficient pedal pressure in reverse and sometimes in forward when dropping off rocks. In 2 wd it's not a problem. I hope he jumps on this but I wanted to see if anyone else had the same problem. I don't have a Vac gage on it so I can't tell you what the booster is seeing. Idle speed is pretty consistent. Per Blaine I had already had the system flushed with the correct brake fluid and it made a big difference on the street. Could trail dust on the rotors have something to do with it?
Feel free to weigh in.
Thanks
Bob

Rubi513 08-19-2013 09:08 PM

I have the same problem. It wasn't too bad with the original 4.10 gears but after I went to 5.13 gears the problem magnified. I need to go ahead and get the vanco brake kit

Gunner 08-19-2013 09:38 PM

I have 4.88's. But i'm not sure it is a brake rotor/caliper problem as opposed to say a Master cyl booster.

Rubi513 08-21-2013 07:14 AM

Have you upgraded to the black magic pads? Just curious if this helped at all.

VTBalla34 08-21-2013 08:04 AM

Quote:

Originally Posted by Rubi513 (Post 4098337)
I have the same problem. It wasn't too bad with the original 4.10 gears but after I went to 5.13 gears the problem magnified. I need to go ahead and get the vanco brake kit

I'm having a hard time getting my head around the gear ratio impacting the braking ability. I'm regearing from 3.73 to 4.88 soon so this caught my attention. Can you clue me in on how that works?

Jerry Bransford 08-21-2013 08:17 AM

The combination of 4Lo and a low axle ratio boosts the amount of torque being sent to the axles so much that the brakes have a hard time stopping a Jeep, it's a common issue... especially when you also have an automatic transmission which increases the amount of torque even more.

The only solution is a more powerful set of brakes like the Big Brake kit from powerbrakes hydroboosts vacuum boosters everything for your extreme braking needs that Blaine had a major part in designing.

I drove a TJ last week that was literally unstoppable. It had 5.38 gearing, 4:1 Rubicon t-case, and the RubiCrawler from Advance Adapters at RubiCrawler | Advance Adapters I tried it in 4Lo and I literally couldn't stop it, I had to shift into Neutral to get it to stop. The RubicCrawler adds another extra-low gear option that provides an additional 2.72 (or optionally 4:1 or 10.88:1) behind the transmission that more than doubles the Crawl Ratio.

Rubi513 08-21-2013 08:56 AM

Quote:

Originally Posted by VTBalla34 (Post 4103793)
I'm having a hard time getting my head around the gear ratio impacting the braking ability. I'm regearing from 3.73 to 4.88 soon so this caught my attention. Can you clue me in on how that works?

Jerry pretty much summed it up. I have an automatic, so when in 4lo with the lower gear ratio its harder to stop. You would be surprised at what it will just idle up. When going down hill I always keep my hand on the shifter, so if I have to stop I can throw it in neutral. Because it will not stop in 4lo when going down hill.


All times are GMT -5. The time now is 07:45 PM.