master cylinder

LoriannehLorianneh Band Wagon
in Suspension, Braking & Wheels
Hi
Does anyone have experience replacing the master cylinder? the lines that go into our 89 wagon 's master cylinder point downward (like an upside down letter "U"), thus rendering it impossible to fill them with fluid before screwing onto the master cylinder. How do you remove the air?
Thanks
Lorianne

Comments

  • HaydzHaydz Moderator
    You use a process of 'bleeding' the system but there is a certain order that you need to do it in... while you are at it do a full bleed and flush so that the whole system contains new fluid, you won't regret it!
  • mrwagovanmrwagovan familEE

    buy a new MC from your local Honda dealer..preferably a 15/16ths one..a 91 EX has a 15/16ths cuz that's the one i put in.

    you should unscrew all the hardlines with an open flare nut wrench and pull out the MC from the booster.
    take the cup out of the top and get rid of what's left in there and pour in some fresh fluid.

    then pump the piston with your hand so it will squirt out some of that new fluid you just put in..and that will remove any air.

    got it?
  • LoriannehLorianneh Band Wagon
    We have installed two new master cylinders, a brake booster, a proportioning valve, two wheel cylinders, brake shoes, brake pads and a check valve. We have bled, in the approved cross pattern, until we are blue in the face, but still the brakes go to the floor before they grab. We are assuming there still is air in the line, coming from the odd shape of the naster cylinder. We can't think of anyother reason why the brakes are not working. Any suggestions welcome!
  • turbo_tegturbo_teg Council Member
    un-do the lines going into the master cylinder have a buddy get in the car. fill the resivoir up and have the person inside push the pedal to the floor, place your fingers over the holes pissing break fluid from the master cylinder while your buddy lifts his foot off the pedal repeat this 6 or 7 times just make sure yer friend doesnt lift the pedal before u put your fingers on the holes or u have to start all over. did u put new calipers on the front? if u did make sure u put them in with the bleeder at the top. im not even sure if on a honda its possible to put them in upside down/backwords but ive seen people bring in there cars who did there own break jobs and put calipers in wrong which makes it nearly impossible to bleed out GL
  • turbo_tegturbo_teg Council Member
    and of course re-bleed the whole system again.
  • jhotajhota familEE
    pedal height is directly affected by how your rear shoes are adjusted. if they are too loose, the pedal will be very low. since you've replaced the shoes, check the brake adjustment and the drum diameter. either can cause the problem you're describing.
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