Brake pedal goes to floor
1990 Subaru Loyale

Brake pedal goes to floor

(1990 Subaru Loyale)
1) No fluid leaks
2) Replaced , bled master cylinder
3) bled system twice
3) Hoses, lines, pads - OK
4) Engine has good vacuum and idle
5) Checked rear brake adjusters - OK
6) Booster checks out OK with pedal tests

Automatic, no ABS, no hill holder.

Don't know what else to do. Everything seems OK but pedal still goes to floor.

====

UPDATE 1: Had to put this project aside for awhile. I wasn't getting anywhere.

Came back to work on it and when I tried to move the vehicle, it was stuck. I jiggled the e-bake a few times and heard a "klunk" and then the car moved. Braking was then better, but still not 100%. So I rechecked everything.

Rechecked all pistons, calipers discs, drums pads and shoes. No problems found. Everything within spec (not new). No leaks, all lines look ok. Rechecked adjusters-ok. Bled the Master cylinder and lines (multiple times). No change.

Braking is back to where I started :(
...Low brake pedal, wheels can't lock up.

thoughts ?
What seems to make the problem better or worse? No change from repairs made so far
How long have you had this problem? Months... Pedal has been slowly getting worse - now virtually no brakes
Tags: master brake cylinder, brake pedal goes to floo, subaru, loyale
2 answers & 3 comments
Popular Answer
on October 03, 2018
1 - **Air still trapped in hydraulic system** .. 2 - Brake caliper(s) frozen in position due to improper mounting or corrosion - (calipers must be free to slide as brakes are applied)
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on October 03, 2018

Vacuum brake booster can not cause excessive brake pedal travel !
on October 03, 2018
It will take *SEVERAL* attempts to purge all air from system - continue bleeding.

Dismount calipers - throughly inspect and clean ‘ALL’ caliper related mounting hardware.
on October 03, 2018

When any of the calipers become locked into position due to corroded mounting bolts / hardware - it WILL result in excessive caliper piston travel which in turn results in low brake pedal .. This tends to get worse over time as brake pads wear..

Note: The master cylinder should have been properly bench bled prior to installation.

*Hands-on* help from qualified personnel may br required.

Good luck!
Vacuum Leak Diagnosis
$88 - $111 Learn More
on October 03, 2018
1 - **Air still trapped in hydraulic system** .. 2 - Brake caliper(s) frozen in position due to improper mounting or corrosion - (calipers must be free to slide as brakes are applied)
Sign in to reply
on October 03, 2018

Vacuum brake booster can not cause excessive brake pedal travel !
on October 03, 2018
It will take *SEVERAL* attempts to purge all air from system - continue bleeding.

Dismount calipers - throughly inspect and clean ‘ALL’ caliper related mounting hardware.
on October 03, 2018

When any of the calipers become locked into position due to corroded mounting bolts / hardware - it WILL result in excessive caliper piston travel which in turn results in low brake pedal .. This tends to get worse over time as brake pads wear..

Note: The master cylinder should have been properly bench bled prior to installation.

*Hands-on* help from qualified personnel may br required.

Good luck!
of Steve's Imports on October 03, 2018
I’ve had bad Master Cyinders right off the shelf that leak internally. You also may want to try using a pressure bleeder rather than manually doing it.
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