D90 brake problems off road - Defender Source
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  #1  
Old July 2nd, 2007, 11:07 AM
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Todd Kendrick
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D90 brake problems off road

I have a '95 D90 w/ stock braking system except for SS ext lines. I changed out the master cylinder a couple of years ago and since then brakes have seemed soft when off road. The first time I apply pressure to the pedal it goes almost to the bottom; second time it responds at the top and will stay at the top. On the road the brake pedal is at the top all the time. I have checked the bearings and everything seems tight there. Any ideas? Thanks in advance...........



Todd
'95 D90 #2216
Taos, NM
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  #2  
Old July 2nd, 2007, 12:15 PM
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mark kellgren
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definitely sounds to me like you need a brake bleed (air in the system). also check to see if air is getting into the system (loose bleeder screw(s) or line fixtures to the master cylinder). Finally, for your petrol engine, a leaky cracked vacuum line to the power booster (cracks in the line or leaks at the ends) can cause variable braking performance.

Quote:
Originally Posted by taoseno
...The first time I apply pressure to the pedal it goes almost to the bottom;
That however sounds just like air in your system.
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  #3  
Old July 2nd, 2007, 12:26 PM
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Mike Hansen
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Quote:
Originally Posted by Overlander

That however sounds just like air in your system.
I'll bet a half rack of sauce that is the issue!

If they brakes get stiffer when you pump them (sound like porn) then its your master cylinder.

Cheers

MH
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  #4  
Old July 3rd, 2007, 10:33 AM
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Todd Kendrick
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I have bled the system many times; I don't think this is the issue.............Why would I have normal pedal on the road if there is air in the system?


Todd
Taos, NM
'95 D90 #2216
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  #5  
Old July 3rd, 2007, 11:04 AM
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Stephan Laputka
1995 D-90 SW
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funny, my truck does the exact same thing. brakes are great on the road. The thing I couldn't figure out was if it's loosing pressure in low range why does it not happen in high range regardless of engine rpms? I don't loose pedal pressure sitting in traffic with the engine idling but I do loose it idling in low range on the trail. I don't get it.
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  #6  
Old July 3rd, 2007, 11:56 AM
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Todd Kendrick
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I just got an e-mail from Roadside Rob in Albuquerque (below). The bearings I suspected seem to be the culprit.............I guess the default answer is always bleed the brakes. Nice to know someone else has this problem besides me........Mt. Blanca is not the place for soft brakes.



Todd,
The trip was great but bummed we missed you guys.
As far as the brakes go, I'd still suspect the wheel bearings. The weight of the truck bouncing along the trail is able to create way more lateral force on the wheels than you can checking in your driveway. This lateral force will push the pistons back into the calipers and give a soft pedal on the first pump. All of my cars do this to some extent. Adjust the wheel bearings by torquing the inner nut to 40 lbft., backing off 90 degrees, and then retorquing to 10 lbft. while spinning the wheel. Lock the adjustment by torquing the outer nut to 40 lbft. This is a more accurate & consistent than adjusting the nut to just take the play out of the bearing.
Regards,
Rob


Todd
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  #7  
Old July 4th, 2007, 01:27 AM
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Stephan Laputka
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Wow, that makes complete sense. Never even thought of that. This might be a wildly stupid question but how do people properly torque the hub nuts? Last I checked there ain't a torque wrench out there that mates up with a LR hub socket. Most LR mechanics just tell me for the first nut "throw a scewdriver throught the socket and give the first nut a medium tug. Wrench on the second nut until the first begins to turn. hammer down the tabs and check for play" I now await the follow up posts explaining why this is a terrible method...
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