BRAKE PEDAL FADE UNTIL PUMPED ONCE - 2002 Toyota Sienna

Air in lines???

bleed the whole system back to front..still fade you are getting air somewhere... may have to bleed the master out of the car then put back

you have someone helping you right? cuz you cant do it yourself, and the brakes need to be pumped only enough to get a solid midway stop of pedal travel, and with the brake still depressed by your assistant, you open the bleeder a bit until the pedal goes to the floor, you tighten bleeder, they then release brake pedal and pump it up again, rinse, repeat, until there is no spongy feel in brake pedal

I don't think even you, could come up with
a question for us!!

Just repair it yourself or have it repaired

There is no need to discuss what,why etc

Sounds like your brake system has air in the lines. You will need to bleed your brakes starting with the longest line from your master cylinder. be sure your master cylinder is full and open the bleeder valve on the furthest line and have someone slowly push on the brake pedal till it is to the floor then close the bleeder and have the pedal returned to the rest position. Continue until no air comes from the bleeder. Move on to the next longest line and repeat until all lines are clear of air. Be sure to not run master cylinder low of fluid or you will have to start over. Let me know if this helps. Thanks.

mcdevito75 here, you:ll have to be alittle more secific with your problem, does the pedal fade at a red light?? The power brake assist will cause the pedal to fade just a shade, if your drums / Rotors were cut to often or cut too much the pedal will fade, also make sure you have brake linning

You will need two people, one to pump the pedal and one to open bleeders at the wheels. Start at the right rear wheel open bleeder and have someone press the brake pedal down and hold it (do not release pedal until bleeder is closed), close the bleeder and repeat until no air is coming out. Proceed to right rear wheel repeat above prceedure, proceed to right front wheel repeat above, go to left front wheel repeat above, and then check pedal for proper feel if it is a solid pedal with no fade then you have finished. If you have a low pedal or fade then bleed master cylinder. You can bleed master by breaking loose the rear line (do not loosen line all the way) just enough that fluid comes out when pedal is pressed and held. Have some press the pedal while line is loose and hold it, tighten line and repeat until no air comes out, repeat same proceedure with the front line. If you still have a low pedal or fade then you may have a leak somewhere or a faulty master cylinder.

If you are positive everything is bled out perfectly, it's possible that there is too much runout in the wheel bearings in front and they are pushing the pads back too far.

Does it feel solid after they are pumped up once? Another possibility is that the adjusters are not coming up in the rear brakes, and the springs are pulling the cylinders back too far.

the only thing left unless you have a leak is the proportioning valve A soft pedal can also be caused by badly adjusted rear brakes but you shouldn't experience a pedal fade right to the floor with bad adjustment.

still got air bleed more