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  1. N

    Spongy brakes

    So a bit of an update on the problem. I’ve replaced the master cylinder once again, and replaced the booster with it. At first it seemed better, but after some driving it’s clearly not any better. So now every part in the brake circuit, except for the ABS pump, has been replaced or rebuilt. And...
  2. N

    Spongy brakes

    What symptoms did you have with your booster? I wanted to rebuild the old one but it has the rear part of the piston jammed inside, probably was pumped to the death while bleeding once in it’s life so I needed replacing anyway. Will rebuild the new one I have and check for marks inside.
  3. N

    Spongy brakes

    The sensing line from the front is the one that has the bleeder on the LSPV, that’s why theres a bleeder. Before the brake hoses. At the ABS pump.
  4. N

    Spongy brakes

    Correct Correct The rear port was reconnected and bled. Yup If I could source a pressure gauge with adapter this could be an option. However this is simple hydraulics, really not complicated. It really should not be difficult, but indeed this is getting so frustrating and time consuming...
  5. N

    Spongy brakes

    I’ve plugged the line to the rear calipers and bled, no difference. Then I plugged the line to the front left side caliper and bled, this gives me solid pedal!! No more spongy pedal! Connected again and bled, plugged the line to the front right caliper, gives me a solid pedal aswell...
  6. N

    Spongy brakes

    Yep the bleeders are pointing up, had a friend make that mistake before :) Yes Everything checks ok, and yet still this mistery remains unsolved. I’m gonna try plugging front left , then front right, and then the rear brake linea one by one and see if it makes any difference in pedal feel. And...
  7. N

    Spongy brakes

    Here can you see the rise and drop of the fluid level. To me it looks normal as when the piston gets pressed, the Front piston seal moves passed a tiny compensating hole wich connects the body of the MC to the reservoir, but still not too sure about it. An OEM rebuild kit is ordered for the...
  8. N

    Spongy brakes

    Did some more testing today, I found that when I press the brake pedal, the brake fluid level rises up, when releasing, it drops again. is this normal behaviour due to a compensating port from cylinder to reservoir, our does it automatically mean leaking seals? Anyone could check this on his...
  9. N

    Spongy brakes

    Would this not be against the common sense? Not saying it didn’t fix your problem, but what would the logic explanation be for the booster being the problem?
  10. N

    Spongy brakes

    A faulty new master could be, but it would be unlikely I think. It must be either air, or a seal in the master or the ABS pump leaking internally. I’ve agressivly pumped it while the pressure bleeder was doing it’s think, bleeder open only slightly for some resistance. I can do one more time...
  11. N

    Spongy brakes

    Did that already a dozen times
  12. N

    Spongy brakes

    I tried the procedure in there but I think it will make a short circuit. I’m going to put it on jack stands and get the wheels spinning, then apply the brakes while I’m bleeding each bleeder, see if it improves any.
  13. N

    Spongy brakes

    I have not replaced the booster. I think it’s ok? The pedal pumps up hard with the engine off and sinks down when I start it. When fitting the master cylinder I put pressure on it with the pressure bleeder then loosened the unions untill no air came out anymore. The LSPV has not been adjusted...
  14. N

    Spongy brakes

    I’ve unbolted the rod and moved it up and down whilst bleeding
  15. N

    Spongy brakes

    I’ve bled with the rod down aswell as up. Made no real difference. But will move it up and down while I bleed it again tomorrow. Someone suggested to always start with the LSPV as it’s the highest point, so I’ll try that aswell.
  16. N

    Spongy brakes

    I really did not want to open another spongy brakes thread, but after reading so many threads and not finding an answer I am a bit out of options. My 80 has had the low spongt brake pedal for years, and for some reason I figuered it was just an 80 thing, untill a drove a couple of other 80s that...
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