No brake fluid/pressure to RR caliper 1990 740 GL no ABS

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Old 05-12-2018, 05:12 PM
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Question No brake fluid/pressure to RR caliper 1990 740 GL no ABS

Hi all,


Went to replace the brake pads, and decided to flush the fluid (overdue). Could not get any fluid to come out of the bleeder (I have a helper).


Replaced the caliper. Still can't get any fluid to come out. Replaced the master cylinder. Still no fluid.


I'm stumped. I've read proportioning valves can get stuck, but I can't find out if this model has a brake proportioning valve (or where it is). I see a block under the MC where two lines go in and four go out.


Halp! Thanks in advance.
 
  #2  
Old 05-13-2018, 07:39 AM
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Remove the brake hose and see if you have fluid at the metal brake line.
 
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Old 05-13-2018, 04:02 PM
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Originally Posted by jagtoes View Post
Remove the brake hose and see if you have fluid at the metal brake line.

No significant fluid (just a dribble, then nothing). Tried the bleed routine (brake pedal down, hold thumb over the end, pedal up, release thumb, repeat) some dozen times, but no fluid.


Removed the rear line fittings at the brake distribution block, one fitting gushed fluid.


Removed the other, no fluid.


Gently pushed a blunt steel probe into the fitting opening on the block (thinking something was stuck or lodged in there), after which fluid came out strong during the bleed routine (at the distribution block).


Thought I had it licked, but after putting everything back together, no air or fluid came out at the RR brake line.


Went back and rechecked the rear line connection at the distribution block, and there was still good flow there.




...Is there some other valve somewhere on this?


Otherwise, is it possible that I have a clogged brake line?! Seems unlikely...






EDIT: Searched this thing called the Inter-net and saw this http://s4.zetaboards.com/CJ3B_Bullet...6219&t=1181204


Which said: "You could have blockages in the flexible rubber lines - two on the front and one in the rear - it's very common for the interior of the flex lines to swell and cause blockages. Without disassembing ALL the brake lines on your vehicle and assessing their condition, it's very difficult to give you any accurate determination of the condition of the INTERIOR of the brake lines."


So I'm thinking I need to replace the short rubber lines all around (they might be original equipment..!)
 

Last edited by dnarby; 05-13-2018 at 05:21 PM. Reason: Derp
  #4  
Old 05-16-2018, 10:45 PM
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Jagtoes for the win!

Spot on - It was a bad flexible hose. Couldn't get the fitting off, so I cut the line directly in front of the fitting and presto!



...THE DOT3 MUST FLOW.


Now it's off to the ahtow pahts stoah for a fitting and a line.
 
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