Question about 1989 Mazda 626

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Brakes go to floor changed master cylinder to no avail still to the floor

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  • Zaraki May 11, 2010

    Was the master cylinder bled properly before it was installed? Was the entire brake system then bled? Is there any leaking fluid? (look behind the tires for wet backing plates) Do any of the rubber lines in the brake system balloon out when you step on the brake pedal? (older worn out brake lines will expand and contract with the brake pedal) Bleed brakes in this order, right rear, left rear, right front, left front.

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  • Mazda Master
  • 6,826 Answers

Most likely problem is with the rear brakes,if it is pads,replace them,if it has brake shoes,try adjusting them,unless they are too thin,replace them,and adjust them,still low pedal,bleed the master,then the right rear,left rear,and right front,and left front,in that order,dont run out of brake fluid during this,or you will have to start over.

Posted on Apr 23, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Apr 23, 2010

    Did you bleed the master before putting it on the vehicle?It needs to be bled before the lines are hooked up,then hook the lines up,and bleed them at the master cylinder where you screwed them in at,then do the wheels.

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  • Master
  • 2,427 Answers

Ok there are a few things you need to check.. you said you changed the master cylinder.. did you bleed the braking system after???

  • remove from wheel,,
  • locate bleed valve on caliper / or unscrew one of the lines
  • pump brake and push right down and hole,,
  • repeat plugging the lines with your finger ,,
  • repeat the above 2 steps a few times
  • tighten the bleed screw while holding the brake right down..
if that fails ...

if that fails try adjusting the brake up.. its on the rear tires,, remove one and them remove the shield protecting the brake shoe,, see the turn bolt that adjust the pistons,, adjust that a bit until the brake is in the desired position..

check your disc pads to see if its wron out..

check your booster / change it..

Posted on Apr 23, 2010

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