Re: Strange Problem With 1995 Wrangler
I would guess you have power brake booster issues or MC issues. The
booster is the unit between the master and the firewall. I also have seen rebuilt masters go 'hard' too. An internal seal or something went strange. The one I saw recently was standard brakes, so there was no power or vacuum issues, others I have seen in the past had a vacuum issue of some sorts that affected the idle if you pumped on the 'hard' pedal. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Paul wrote: > > Attention all you amateur and pro jeep mechanics out there...I have a > problem for ya > > I have a 1995 Jeep Wrangler, 5 speed, 4.0L engine. > The jeep is totally stock with P21575R15 tires (Goodyear Wrangler > Radials) > The jeep developed a problem last summer which has appeared again this > summer. After work, when the temperature is 88 or better, I jump in > the jeep to start the trek home. After I start up the jeep the brake > pedal feels hard to push. I still have very good brakes and it stops > ok, it's just that the pedal feels much stiffer. When this happens, on > the way home I have very little power going up hills. I usually have > to downshift to 3rd to make hills that I could normally make in 4th > gear. In the morning on my trip into work the jeep seems to run fine. > When the temperature is below 80 the Jeep seems to run fine. Before > you answer..here are some of the things I have already done: > > new spark plugs, distributor cap and rotor > > new ignition wires > > new oxygen sensor > > Jeep dealer put the scan tool on the computer and said I needed a new > crankshaft position sensor which he replaced. He also put fuel > injector cleaner in fuel rail and some other cleaner in gas tank. > He also set the timing to chrysler specs using the scan tool. > > Mechanic sprayed Gumout carb cleaner all over the vaccuum lines to see > if any were leaking. Found no leaks. Sprayed around the power brake > unit..no leaks. > > I had the brakes bled twice (I thought trapped air was expanding and > causing the brakes to drag) > > I adjusted the rear brakes with brake calipers and they are not > dragging. The parking brake appears to work ok. > > Both rear wheel cylinders new last year > > Rebuilt master brake cylinder put on last year.. > > New Clutch master/slave linkage installed > New clutch installed, but this was just done a month ago, long after > the problem had been noticed. Same for the clutch linkage. > > The fuel filter is less than a year old and the air cleaner is new. > > I'm out of ideas and I'm thinking of trading my beloved YJ in for a > (excuse the expression) rice box. > > My theories, none of which have been tested........... > > 1. A front brake caliper piston is sticking and causing a front brake > to drag. I smell no brake smell and the vehicle stops arrow straight. > Would a sticking piston cause a hard brake pedal? I dont think so. > Loss of manifold vaccuum causes the hard pedal. > > 2. The power brake booster is leaking internally when the temperature > gets really hot. I can jump into my jeep after work and press the > brake pedal in 2 or 3 times before I run out of stored vaccuum. Thus > the booster has stored this vaccuum for 9 hours...could the brake > power booster still be bad? > > What do you think??? Got any ideas?? > > Thanks in advance > > Paul |
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