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2000 Ford F-150 Repair Question


Topics covered: Abs, Brake pedal, Brakes.
Mileage: 90,000 miles.

Asked on November 26, 2010

Soft brake pedal

My ford f-150 ,4 double piston disc brakes and abs (yr-2000,4wd) when stopped with pressure on brake pedal starts to creap forward when in drive. changed primary and secondary lines at master cyclinder. changed master cyclinder three times and also front calipers and pads. it still creaps forward. next i'll be changing rear calipers . i feel i'm still sucking air from somewhere or there is still air in the system which i can't get out. i've gravity bleed, vacuum bleed and the 2 person , pump it up 6 times,keep pressure on brakes and open up line routine. with enging off and also on. whats going on ----please let me know---- . vin#1FTRX18WXYNA26038.
Avatar Asked by yacadee

Answer

Replied on November 26, 2010

explain to me how you bleed the master cylinder?

Tiny Answered by Dr Loot (expert)
2,178 answers provided
Replied on November 29, 2010

bench bleed:using plastic lines and nylon fittings with master cylinder from primary and secondary exits to resevoir with this setup.using a full stroke on plunger to a short stroke both fast and slow, waiting seconds between strokes. also bleed when lines were attached by cracking open the line at the master with help on the brake after finding tk. still would creap. one remanufactured and two new masters were used and all made by fenco.

Tiny Response from yacadee
1 question asked
Replied on November 29, 2010

I am glad to hear that you've bleed the master cylinder property, now I have another question how much pedal travel do you have before you can feel the master cylinder activating?

Tiny Answered by Dr Loot (expert)
2,178 answers provided

Replied on December 2, 2010

3" to4"

Tiny Response from yacadee
1 question asked
Replied on December 2, 2010

thats to much, do you still have the old masters cylinder? you will have to measure the depth of your old master cylinder, remove the current one make sure they are the same, if not adjust Rod on brake pedal to master cylinder.

Tiny Answered by Dr Loot (expert)
2,178 answers provided
Replied on December 3, 2010

the old one did the same as the others. thats one other reason why I changed the master 3 times. could it be the rabs valve needs to be bled and if so where can I find it.

Tiny Response from yacadee
1 question asked

Replied on December 3, 2010

you stated 3" to4" before the break pedal made contact, you do not need to remove any of the brake lines on bolt the master cylinder, move it forward you can bend the lines a little bit just make sure you do not kink them, you see the rod that goes into the master cylinder with a nut on the end it is adjustable bring out about a 1" reinstall Master and see how much play you have, you should only have about a half an inch at the pedal before contact.

Tiny Answered by Dr Loot (expert)
2,178 answers provided