Question about 1998 Toyota Camry

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After replacing the master cylinder my brakes don't work

I replaced the master cylinder with a new one thinking the one I bought earlier was defected but I still cannot get the system to bleed. I will get a full pedal for a few seconds and then they go to the floor again. What am I doing wrong?

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  • janksheppard Mar 04, 2009

    Yes I am but I still am unable to get a full pedal.

  • janksheppard Mar 04, 2009

    I get a partial pedal and if you try to drive it you loose the rear brakes and the front are trying to pull and or skid.

  • janksheppard Mar 05, 2009

    Thank you bushmechanic for giving me the information. We've already tried that. We will keep plugging along until we get it right.
    Have a great day.

    Jan


  • janksheppard Mar 09, 2009

    I'm so sorry I took so long to acknowledge your remark. We found the problem was in the ABS system. I forget what it's called (actuator I think) but after it was replaced it solved the problem.

    Thank you so much for taking the time to help me on this car. I hope you have a great week.

    Jan Sheppard


  • yadayada
    yadayada May 11, 2010

    considering the danger of an accident here don't u thin it's about time for a trip to the dealer.

  • yadayada
    yadayada May 11, 2010

    are u following the factory procedure to bleed anti lock brakes?

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Some vehicles require pressure bleeding, for this you need specialised equiptment. some thing you can try is to bleed your master cylinder first. to do this you place the unit in a vise. fill both resevoirs then pump the unit by placeng your fingers over each outlet ani pushing the centre piston with a suitable screw driver.
do this until there is no bubbles left in the system
remove from the vise put into car and bleed normally

Posted on Mar 05, 2009

  • Grahame Begg Mar 05, 2009

    hi me again, it is hard to work through a problem like this but try this. first make sure that the master is bled properly, then move down the brake lines making sure you move down each line equaly eg go to the first join of each(this prevents air transfering to the other system, next bleed all fittings and nipples around the abs unit. after that you can look at bleeding the wheels

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Had the exact same issue with an 04 Cadillac srx. Replaced the booster twice...finally put my old "defective" master cylinder back on and brakes worked fine. Turned out the new master cylinder was bad...even though the symptoms point to the booster. Do check the vacuum hose going to the booster first though. Have seen those go bad and cause weird problems and it's the easiest thing to check first.

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Master cylinders are (usually) on a split circuit system - that is, the front left brake is on the same line as the rear right. The front right brake is on the same circuit as the rear left.

A point to be aware of is when bleeding brakes/doing brake work and if the master cylinder runs dry, is that a seal inside the master cylinder can fail/twist over and not pressurise that particular line, even though it may pressurise the opposite brake line.

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.. and could I get a hard pedal after the job was completed? I must have bled the brakes three times a day for a week and couldn't get a brake pedal. I phoned a full time mechanic I know - he came and tried to bleed the brakes three times and couldn't get a hard pedal.

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You're probably fed up with your braking problem now ... and apparently this 'no fluid/brake pedal' is more common than you may think.

Try bleeding the master cylinder if you can. If you suspect that it isn't fully working - try an overhaul kit which is cheaper than a new master cylinder.

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The positive aspect is that you are doing your own work and know what you're doing. You're saving on labour charges.

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Are you losing any Brake Fluid? Is it visible anywhere at the four wheels? Is it visible anywhere else?
The Master Cylinder may be defective. When you bled the Brakes did you maintain proper Brake Fluid Level in the Master Cylinder? If you didn't: and air entered into the Master Cylinder there maybe air within in the system in the Master Cylinder. You can bleed the Master Cylinder by removing the brake lines, adding more fluid, pumping the brakes, bleeding the air out of the system.
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