hydro not locking wheels on bmw e36

Thread in 'Technical Questions' started by steven, Jul 17, 2012.

  1. steven

    steven Member

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    ive just fitted a hydro to my bmw e36. its a 1998 so has the twin pipes going from the junction block to the rear wheels. i basically joined the two pipes together which come out of the junction block with a t piece then had one line coming out of that to the inlet on the hydro. then ive got one line coming out of the outlet on the hydro to another t piece then two lines coming out of the t piece (one to each rear wheel). ive basically done it the same as shown on some drawings which were posted on dw. ive bled the whole system coutless times, there is no air left in the system at all. the footbrake and hydro feel as they should and the footbrake pulls up really well however the handbrake does not lock the rear wheels. i can feel it slowing the car down but is nowhere near locking the wheels. will not even skid the wheels on gravel.

    ive fitted new discs and pads all round and have drove hundreds of miles to bed them in.

    Any idea why its not working as good as it should.

    Its a obp vertical lever hydro.

    Thanks, steven.
     
  2. Broadley

    Broadley Member

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    I'm having the same problem, it means learning again when I get it working.
     
  3. steven

    steven Member

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    I cannot understand it, mine does not work much better than the cable handbrake which i also have on the car?
     
  4. riverslider

    riverslider Member

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    I had the same issue buddy,

    try.... pulling the handbrake back to full. lock it there somehow, then bleed your rears up as normal. worked for me :)

    if it doesnt work, i dont know, im only giving advice as to what worked for me
     
  5. steven

    steven Member

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    I will give that a try as soon as poss.:)
     
  6. Bolf

    Bolf Resident Nut Job.

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    What size cylinder is on the hydro?
     
  7. steven

    steven Member

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    Not sure i just got the one they give you as standard with the obp handbrake
     
  8. GB / John

    GB / John NDC Runner Up 2012

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    I bet thats the problem, if its not 0.625 it prob wont lock. Mine locks perfectly well even at 100mph.
    Either that or you got the input/output the wrong way round on the cylinder.
     
  9. Rich330

    Rich330 Member

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    I'm having trouble finding out how I need to plum in the hyro on an E46.. Sounds like it may be a similar set up on the 36 - do you have this diagram of how it should work to hand?
     
  10. Bolf

    Bolf Resident Nut Job.

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    0.700 is OBP default
     
  11. GB / John

    GB / John NDC Runner Up 2012

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    This 1?

    [​IMG]
     
  12. steven

    steven Member

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    The above diagram is exactly how ive fitted it and have double checked it. Is there any way of double checking what cylinder size i have by looking at it? I did not buy it directly from obp but from a shop that sells their products.
     
  13. Jeek™

    Jeek™ Active Member

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    we had this issue with the obp hydros on e36s. in the end we put a longer handle on it. and only use the dw design ones now.
     
  14. steven

    steven Member

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    I've tried bleeding it again today with the hydro pulled up but is still the same?
     
  15. steven

    steven Member

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    Ive just bought a brand new 0.625 cylinder so will fit that on this weekend and let you know if it works.
     
  16. R32 GTR

    R32 GTR Active Member

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    yep cylinder is your problem. i had the obp handle couldnt get it to work. switched to the silver project one which is double the height and 0.625 and it locks up perfectly.
     
  17. JohnJ

    JohnJ Active Member

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    TBH I'd ditch the ABS too.
     
  18. steven

    steven Member

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    Yep already got rid of the abs and traction control. The car was not liking it with the welded diff.
     
  19. steven

    steven Member

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    Fitted the new 0.625 cylinder. It slows down the car a lot faster and has more bite than the 0.70 but still does not lock the wheels?
     
  20. thomask

    thomask New Member

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    have u checked the brake calipers and lines? Maybe they need replacement/refurbishing?
     

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