Question about 2002 Toyota 4Runner
Did brake lines, have good pressure out of all bleeders and no air, brake light and abs light are not on but the first time you hit the brake its goes about half to the floor then second time there great, no leeks, master is full.
Remove the master & clean out the bore & junk on the piston,
then have a helper push the pedal when you open the bleeders
Mostly air still in there,as long as the flex hoses are not collapsed
inside or the caliper pistons rusted & you removed ALL rust from
sliding surfaces & used anti-seize on those areas
If the system is not flushed every 2 years on ALL vehicles,
you can have moisture issues,hopefully not the abs hcu unit
It won't come into play until your doing 16 to 22 mph, depending
on the vehicle & it's strategy
Posted on Mar 30, 2014
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Posted on Jan 02, 2017
Try jacking up car and put on stands as high as poss as you could have air returning when the pedal is returned ,so jack up car pump pedal 4 times fast and hold down bleed l/h/s/first ,do 2 times then the r/h/side and then push down pedal clamp rubber flex hose over back axlewith small G clamp if pedal good do same to FRONT
Posted on Sep 22, 2009
most likely your master cylinder is acting up try to press hard on your break for a period of time and see if the pedal will sink/replace master
Posted on Jan 13, 2010
You may have a bubble in the ABS. You can try bleeding there by loosening the lines one at a time, like bleeders. I have read that you might need a special rig to bleed some ABS systems. :-(
Posted on Sep 13, 2010
Assumeing you have no big leaks in the new brake lines witch you would see because there would brake fluid all over the ground I would say you didn;t bench bleed the new master cylinder There is air in this part when you buy it and you need to get it out before it will work Heres how you do it first you need a kit it consests of plugs that you screw into the holes that the brake lines go into but they have fittings for hoses to plug on to them you put the master cylinder into a vice screw the plugs into the holes put the hoses on the fittings and put the other end of the little hoses into the cylinder resivior fill the resiviors with brake fluid then take some kind of a tool i like to use a 6 inch 3/8 ths socket extentoin because not sharp but you could use a screw driver And push the piotion in from the back of the unit repeataly until you see now more air bubbles coming out of the two little hoses that are in the resiviors like ten or so pushes Then reinstall hook up the lines and bleed at wheel cylinders with wheel cylinder bleeding always start at the fertist wheel and work your way back to the closetes wheel Its not as hard as it may sound good luck
Posted on Nov 11, 2010
SOURCE: My 2003 Toyota Previa (diesel,
Sounds like there is a fault with the vacuum pump not generating enough vacuum for the brake booster assist, or a leaking vacuum hose. Try pinching off all the vacuum hoses to see if the problem goes away. Could also be a leak in the brake vacuum booster itself
Posted on Mar 10, 2011
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