Brake pedal goes to the floor?

Tiny
CHAD READ
  • MEMBER
Thanks for the tips I will let you know as soon as I get to the source of the problem.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Sounds good, Chad. Take care and good luck. I will watch for your reply.

Joe
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
  • MEMBER
I adjusted the push rod the pedal hardend and remained hard even after it set. (No more sinking to the floor). The front brakes squeezed but they aren't letting go do you recommend bleeding all after?
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Okay, now that we have a good pedal, try to bleed the system. However, air in the system shouldn't cause the system to lock up. So, lets try to narrow it down. First, pump the brakes so the calipers lock. Once they do, open the bleeder on the caliper and see if the caliper releases. If it does, then we need to go further back. Close the bleeder at the caliper. Go the master cylinder, and apply brakes so they lock again and open the front steel line on the master cylinder and see if it releases. If it does, then something is bad in the master cylinder.

One other thought. There is a fluid control valve on the MC that's primary function is to control rear brake pressure. Did you reinstall it? I attached a picture of it.

Let me know.

Joe

PS: You did clean and lube the caliper slid pins, correct?
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
  • MEMBER
I bought a new MC but it did not have the fluid control valve. So I put the old one on. And I cleaned and lubed the caliper pins and I did not tighten them too tight. I made sure I could move them back and forth easily.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Then pressure isn't able to return to the MC. Try the test I suggested and let me know the results. It's either fluid can't return or you got bad calipers and the pistons are sticking.

Take care,
Joe
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
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Ok Thanks
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
No problem. Let me know the results.

Joe
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
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Okay now fluid is coming out of all except the rear drivers side.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
  • MEMBER
Nevermind just had to prop the the pedal fluid shot out of the right front passenger side strongly. Fluid is coming out of all of them now pedal will sink to the floor after sitting a little bit.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
  • MEMBER
Pedal is hardening up front brakes arent letting go I did not completely bleed all of the brakes I just made sure fluid was coming out no air shot out I made sure fluid was coming out of the abs module no air came out of it. Is the an ABS valve somewhere on this truck? I dont know exactly where it is I can see anything.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
  • MEMBER
It seems like all the brake pressure is staying at the front alot more pressure on the passenger side than on the right and just a little fluid coming out of the back right and left and I noticed looks like there is a rubber brake hose tin the middle probably need to be replaced. What do you think.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
  • MEMBER
Should I try to get a new valve?
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
The valve may be the entire problem. It is what determines pressure to the rear. However, I have to be honest with you, I never saw one cause this. But, if the calipers release when you open the bleeder at the MC, that is my first suspect unless the new master cylinder is bad.

Was the vehicle doing the same thing prior to replacing the MC? If not, there may be an internal issue in the MC. There are two plungers. The one for the rear brakes may be bypassing fluid, causing the rear pressure to be low and causing some kind of build up of fluid which in turn doesn't allow the fronts to release.

Do the front brakes release when you open the bleeder?
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
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No they dont open. Yes if I remember correcly the same thing happened with the MC.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
If they don't release when you open the bleeder on the caliper, the problem is either the caliper piston is stuck or the slide pins are bad or not properly installed.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
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Well it would have been a good idea to put them on the right way. LOL
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
  • MEMBER
Okay! Now the passenger front brake compresses and lets go the front drivers side is compress and wont let go. What do you suggest I should do next? This would be very helpful.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
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Now I remember from the beginning the driver's side front brake got really hot from sticking to the rotor so I think I have went back to the beginning of the original problem.
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)
Tiny
CHAD READ
  • MEMBER
If I could fix this one Brake I think it would solve the problem
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Wednesday, March 10th, 2021 AT 11:21 AM (Merged)

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