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SUVs Jeep Liberty and Jeep Liberty Diesel Jeep Liberty/Liberty Diesel Brakes
74 messages, Last post on Oct 05, 2009 at 1:22 PM
You are in the Jeep Liberty and Jeep Liberty Diesel Forum. Your Hosts are steve_ & tidester
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Replying to: tidester (Jan 18, 2006 11:36 pm) You know that an automatic transmission is another hydraulic unit. So what if one hydraulic unit is fighting with another hydraulic unit, say in putting on the brakes and forcing the automatic transmission to stop, What are the odds something might snap? One of the common elements is the differential. The automatic transmission is pushing the axle to sustain speed while the brakes are trying to stop the axle. Wow, aren't we having fun with physics! So, until another day at science class, keep learning about those FUBAR brakes from Jeep. If they can't figure it out, then they're out of business. John
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Replying to: john81 (Jan 19, 2006 7:37 am) http://www.conti-online.com/generator/www/de/en/cas/cas/themes/products/electron- ic_brake_and_safety_systems/new_ways_in_braking_technologies/emb_0602_en.html
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Replying to: caribou1 (Jan 20, 2006 2:11 am) I would have more confidence in motor controlled hydraulic valve rather than a hydraulic pressure valve. The main computer would have alot more control in braking input and feedback response. I am reading over this website, and I'm thinking its not the weekend do-it-yourself'r. The addition of accelerometers and the various sensors would have to be aligned just right for maximum performance. I'm going to find out if someone around here in Southern Ohio or Northern West Virginia sponsors Continental Automotive system. If Jeep negotiated a contract with Continental to reconfigure their 2007 models or could retro-my 2006, I would seriously consider driving over to my dealership Service Dept and let them have a crack at it. Thanks! John
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Replying to: john81 (Jan 20, 2006 11:38 am) There is one thing I would like to find on 4x4 trucks: it's a disk brake directly mounted onto the transfer case. This would be a great deal for those who have to tow and slow down heavy loads because the 4 wheels can spread the braking effort mechanically, and braking before a set of reduction gears calls for less power because this disk would spin faster. |
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| I have replaced my front disc pads twice and rotors once, both by myself. At almost 100,000 miles, my rear brakes are starting to go in my 2002 Liberty Limited. Anyone have pointers for doing such a repair myself...like is it much more complicated than the front brakes? | |
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On smaller cars, braking is immediate. On larger trucks, I saw something similar to a brake time enable. This is a hydraulic valve enabled by an electronic signal. The electronic signal is only enabled once the computer receives a signal from the brake pedal for more than 2 seconds. This eliminates any signal which the computer might confuse from a momentary push on the brake pedal during normal driving. In an emergency, the computer receives the 2 second signal, then tells the hydraulic valve to engage the caliper plungers onto the emergency brake rotor, wherever the rotor is located along the drive system or on the trailer itself. The hydraulic pressure would imitate the pressure of the other brakes so not to create an unbalance. Yes, this would be an additional braking system, not to be confused with the braking system already on the truck and hydraulic lines feeding to the trailer's brakes. This new system opens up a whole new set of possibilites on where to put emergency braking systems because the computer has full access to its function and control. John |
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| After about 48K miles, the front rotors warped on me. I replaced the pads and rotors with Bendix parts and was very careful to ensure that everything was properly lubed and used scotch bright to get the lose rust from behind the rotor. After about 2K miles, the passenger front warped again, so I got another rotor (different manufacturer) and replaced it. After 500 miles, it's back. At this point, the jerking makes it seems like both rotors are warped again. I couldn't find any performance brakes or rotors for the Liberty, so what can I do the third time around to make sure they do not warp again? I've seen something about the calipers here, but my untrained eye could not spot any issues with them anyway. I saw someone mention something about recalibration (whatever that is) of the calipers. HELP! I'm losing my mind over the warping. | |
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How about this, a single plunger caliper. What does a single plunger caliper mean? Only one plunger is activated to push the pads against the rotor, while the other pad reacts accordingly. So, is the rotor receiving unequal forces between the two pads? Then one side of the rotor may be "hotter" than the other, thus creating a warp. What type of brakes were incorporated in the 2002 Liberties, and is this the same for the 2005 or 2006? Front end alignments make sure the rotors are exactly 90 degrees, perpendicular to the ground. If the angle is slightly off, you get a gyroscope effect where the rotor wants to move off axis, creating an opposite force against the ball joints/yoke and CV joint. I would check the front end alignment in the 2002 liberty mentioned above. Wow, too bad Jeep wouldn't just buy your liberty to investigate "what's not suppose to happen!" Does this make sense? John
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Replying to: john81 (Jan 31, 2006 4:22 pm)
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Replying to: wroofyjeeper (Feb 01, 2006 2:46 pm) Now, I read that the front Caliper is equiped as a dual plunger or piston model. The rear (by what I've read) is a single piston caliper. The calipers are essentially a hydraulic valve with multible chambers, depending if its one piston or two. In the maintenance manuals, it mentions to check to see if the hydraulic connections to the caliper or the pistons are leaking. How often are caliper changed or checked? Air can get into the system from boiling fluid during excessive heat. Can hydraulic fluid degrade chemically under heat stress? Hydraulic valves do not operate properly if the fluid is dirty or contains air pockets. Any fluid under high temperatures expands, thus creating more outward force. This outward force causes the caliper pistons to push out that much more creating unwanted friction against the rotor. Is there a way to keep a constant pressure between cold fluid and hot fluid? Are warped rotors "the" cause or a symptom from another source? Rotors are a consumable item, but calipers seemed to be overlooked as a possible suspect. Which should be examined first under situations of premature brake failure? The problems with Jeep Liberties, I guess only in automatics has existed since 2002. I would assume that after 5 years, someone would have figured it out and fixed it. The last people I want to argue and become frustrated with are the good folks at the Service Dept. Besides putting up with the customers, they have to fix the problems coming from the factory, which shouldn't be their concern. John |
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