94 D90 with "Hard" brakes - Defender Source
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  #1  
Old September 2nd, 2014, 04:22 PM
crash05
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94 D90 with "Hard" brakes

I got my 1994 D90 about 2 years ago and ever since I have had it the brake pedal is very hard. I am thinking that the brake booster might be shot. Is this a common thing? How hard is it to change out? Thanks
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  #2  
Old September 4th, 2014, 04:56 PM
crash05
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What about the brake booster?
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  #3  
Old September 4th, 2014, 04:59 PM
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Originally Posted by JSBriggs View Post
I wouldnt say common, but it is 20 years old.

-Jeff
Off topic, but holy beagle attack in your avatar :
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Old September 4th, 2014, 05:15 PM
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On topic

I know brake fluid can become hydrolyzed, its not often changed and opinions on service intervals vary. Might be worth having a shop completely drains and bleed the calipers, shouldn't be an expensive job (as materials are cheap).

Might also be a stuck caliper or a caliper that has frozen open, if you lift it you should be able to inspect each caliper with the wheels on (just apply brakes and spin the tires to see if they are grabbing)
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Old September 4th, 2014, 07:59 PM
crash05
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How do you check the booster?
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  #6  
Old September 4th, 2014, 08:36 PM
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Push your foot hard on the brake with the engine off ... Start the engine and you should feel your foot sink further if it working.
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  #7  
Old September 4th, 2014, 10:07 PM
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Originally Posted by leastonce View Post
Push your foot hard on the brake with the engine off ... Start the engine and you should feel your foot sink further if it working.
Sound advice; easy way to check
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  #8  
Old September 5th, 2014, 04:28 AM
crash05
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Is it a pain to change out?
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  #9  
Old September 5th, 2014, 08:18 AM
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Is it a pain to change out?
It's pointless to even think about it until you've tested it ...
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #10  
Old September 5th, 2014, 09:46 AM
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Hard pedal

We have seen this problem a number of times in our shop one of which was my own POE as others have said bleed brakes completely checking for good flow from all calipers,brake master or booster is possible but mine was the portioning (sp). Valve mounted on the pass side of firewall,slide valve was stuck,after replacement brakes worked like a charm.
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  #11  
Old September 5th, 2014, 10:59 AM
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most likely bad calipers. wheels off, check the pistons all move. not that hard to do really. You'll need a jack, a jack stand or two, a lug wrench, and a big screwdriver or pry bar.

Quote:
Originally Posted by crash05 View Post
I got my 1994 D90 about 2 years ago and ever since I have had it the brake pedal is very hard. I am thinking that the brake booster might be shot. Is this a common thing? How hard is it to change out? Thanks
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