Have the brake fluid changed/flushed with new fluid first thing.

 

Flush and power bleed. Latter is marginally better for removing trapped air.


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I found it very difficult to bleed the brakes on the vehicle with a vacuum device. It basically wouldn't flow, and there is no real way to install a pressure device on the master cylinder. I hooked up my vacuum device (big oil sucker from Harbor Freight) and then would get in the car, pump the brakes 5-6 times, then pull more vacuum on it at the bleed screw, then pump it another 5-6 times, pull more vacuum and then close the bleed screw.


Took me at least an hour to do all four wheels, but completely changed the fluid out, made a big difference in performance, no longer spongy at all.

 

there is no real way to install a pressure device on the master cylinder.

Actually there is. The Motive Products power bleeder with the Power Probe Toyota adapter works great. You wouldn't think the adapter would have a tight enough seal on a non-threaded cap like the Toyota, but it really does.

I have the Motive Products 100:

plus the Power Probe BA10 adapter for the Toyota (fits gen2, not sure a out others):

-Mike



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This could be for several reasons for a spongy pedal. No. There is no adjustment.
Air does not get into the brake system for no reason under normal driving.


I would look at the brakes for a stiff or seized slider pin on the calipers. If a pin is seized it will make the caliper torque off to the side causing a low pedal.


Next thing to look at is the shims on the pads. They rust up and can cause the pads to push back or take up space and cause a spongy pedal.


If you want to bleed the brakes. You should be able to open the bleeder screw and fluid should flow under atmospheric pressure. If not. Most likely cause is the bleeder screw. Take it out and clean it. But remember the brake fluid will leak out of the caliper. 99% of the time the base of the bleeder has a bit of rust in the hole. You can use a pick. Bingo. If you open a bleeder screw. It should flow about 1 drip per second under no pressure. This is just a guideline by me.