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brake pedal goes to the floor, but brakes do stop the truck


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there is no leaks and the fluid was flushed and filled last fall. the lines have been bled and there is no air in the line. this is a more recent problem that seems to be getting worse. there is no leaking at the master cylinder as well. the brakes do stop the truck, you just have to push the pedal way in.

 

so, what do you think, bad master cylinder or booster? :dunno:

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Mine is doing something similar. No fluid leaking brakes are very soft and pedals goes to the floor. Brake light on dash comes on and stays on until i push the pedal down as far as i can then it goes off for a while. I am just gonna swap the booster and master for one from a 95-96 XJ, with those years you don't need to swap the push rod, just have to grind a flat edge into the round end.

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Mine is doing something similar. No fluid leaking brakes are very soft and pedals goes to the floor. Brake light on dash comes on and stays on until i push the pedal down as far as i can then it goes off for a while. I am just gonna swap the booster and master for one from a 95-96 XJ, with those years you don't need to swap the push rod, just have to grind a flat edge into the round end.

 

So the pushrod from my 88 is the same length as one from a 95-96?

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Mine is doing something similar. No fluid leaking brakes are very soft and pedals goes to the floor. Brake light on dash comes on and stays on until i push the pedal down as far as i can then it goes off for a while. I am just gonna swap the booster and master for one from a 95-96 XJ, with those years you don't need to swap the push rod, just have to grind a flat edge into the round end.

 

So the pushrod from my 88 is the same length as one from a 95-96?

 

 

Just the end is shaped different (the end of the 95-96 is round). So you grind part of it flat. Scroll down to the brake booster upgrade and then scroll down to the yellow part of that page: http://www.madxj.com/

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