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  #1  
Old December 4th, 2005, 03:46 PM
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Stephan Laputka
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This problem makes no sense..

I am having an issue with my brakes. On the road, they are great. Firm pedal, doesn't pull, no squeaks nothing, everyhting is great. As soon as the car is shifted into Low range and goes off-road the brake pedal looses it's firmness. You hit the brakes and the pedal goes basically to the floor and then on the second pump it's firm again. but it takes two pumps to get it firm. It is not loosing brake fluid, i've been checking the resevoir. I have no idea on this one. Any advice?? p.s. (yes, i did bleed the lines.. twice)
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  #2  
Old December 4th, 2005, 04:20 PM
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Hans Haase
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Just to make sure, it's on a Defender or something else? You're right, that does sound really odd.

The only possible thing I can think of at this time is if you're driving something with a push-button 4wd system that uses a vacuum source. It might be pushing back the vacuum diaphram in the booster, drawing fluid out of the wheel calipers. But, if you've got a defender, then this wouldn't apply since it's a direct linkage.

Does it only do it once when you initially go into low? Or is it every time you press the brakes while you're in low?

-Hans
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  #3  
Old December 4th, 2005, 04:29 PM
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check for play in the front bearings. Also if you get your breaks wet when off road the same will happen.
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  #4  
Old December 4th, 2005, 05:46 PM
redrover

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ITS EITHER THE BEARINGS OR THE HUB NUT IS WAY LOOSE. jp
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  #5  
Old December 5th, 2005, 09:49 AM
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Stephan Laputka
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Yeah it's a defender. I will check the hub nuts and bearings. I just replaced the bearings on one side so maybe the nut came loose. It happens regardless if the brakes are wet. It was doing it in MOab over the summer and there is certainly no water around then...
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Old December 5th, 2005, 09:50 AM
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Or.... depending on the trail conditions.... mud and muck gets between the pads and disc and pushes the pad away from the disc hence needing two pumps to squeeze the muck out. Happens all the to me on my truck and the bearings etc. are fine.(which is more than can be said for the suspension bushes Again )
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  #7  
Old July 31st, 2007, 02:30 PM
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S. Smith
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I was wheeling my 110 this weekend and the very same thing happened to me. I am negotiating a tough part of the trail and put on the brakes and woosh, straight to the floor. If I had not read this post I would have been totally freaked out.

Same thing, one pump, back up no prob. On the road they are fine but it does feel like they rear drum adjusters have moved and they need to be adjusted again. Considering the terrain I could understand them turning.

I drove a Disco on a short part of the trail as well and we were doing a nasty bit of ledge climbing, I had to back up and put on the brakes and the Disco brakes went mushy too. I pumped the pedal but in the Disco it made no difference other than scaring the owner that was in the passenger seat. In the 110 it did bring the pedal back up.

I wonder if it has anything to do with the angle of the vehicle, in both cases the nose was up a good bit over the rump.
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Old July 31st, 2007, 02:49 PM
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Bearings and hub nut preload.... x2
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  #9  
Old July 31st, 2007, 02:54 PM
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I will check my bearings and hub nut pre-load.
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