Why does my brake pedal go to the floor? Here is no air in the lines

Tiny
CHEVYCRUISERGIRL
  • MEMBER
  • 1988 TOYOTA LANDCRUISER
We are still having problems with our brakes on our Landcruiser. So far we have replaced the vacuum booster, the master cylinder, the front disc pads, the rear drums and shoes and the wheel cylinders on the back drums. We have bled the brakes till there is no air in the lines and we end up with really good pressure in the pedal, but then when you turn the car on the pedal just about goes to the floor and we have no handbrake. When we took the drums and shoes off the rear we noticed that the drivers side did not have the automatic adjusting lever on it. Could this be a problem? Before we replaced the front pads (which is when all the problems started) the brakes and the handbrake where fine.
Saturday, September 17th, 2011 AT 3:00 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Okay, I think I was working with this one before. Was the parking brake lever or self adjuster missing? I would suspect there is air in the lines. These guides can help you fix it.

https://youtu.be/w7gUsj2us0U

and

https://youtu.be/WDxvEQrMkBg

and

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please run down these guides and report back. Also, have you checked to make sure the rubber brake hoses on the front are not expanding when you hit the brakes?
Was this
answer
helpful?
Yes
No
Saturday, September 17th, 2011 AT 4:18 AM
Tiny
CHEVYCRUISERGIRL
  • MEMBER
  • 6 POSTS
No the self adjuster is on their, the part that was missing was a plate that sits in front of the parking brake lever. There is the parking brake lever then a c-washer then the plate(that is missing) then a e-ring. Have checked the rubber hoses and they seem to be okay. Still get a good pedal when we have bled them but as soon as we start the car there is not much at all. Also we have no handbrake still.
Was this
answer
helpful?
Yes
No
Saturday, September 17th, 2011 AT 8:45 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Get the handbrake working correctly first.
If the handbrake is not working correctly, it means the shoes are too far away and not contacting. This means the wheel cylinders need to travel far for the shoes to contact the drum and would result in the low brake pressure.

Get the handbrake working first. Ensure the handbrake cable has free travel. Manually pushing the lever (bell crank) at the wheel where handbrake cable is attached to would make the self adjuster work. If handbrake cable is too tight, the self adjuster would not work.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Saturday, September 17th, 2011 AT 11:46 AM

Please login or register to post a reply.

Related Brake Pedal Goes To The Floor Content

Brake Pedal Goes to the Floor
GUIDE
Brake Pedal Goes to the Floor
Experiencing a brake pedal that goes to the floor can be a frightening situation, particularly when you need to stop quickly. The automotive brake system is a hydraulically...