Front Brake Locking when Hot. All New Parts. - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 09-12-2019, 04:03 PM Thread Starter
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Front Brake Locking when Hot. All New Parts.

99.5 F250 4x4 248,500

New Hydroboost
New brake hose
New Calipers (Pins are well greased and move freely)
New Pads
Turned Rotors
Flushed the lines twice
Everything is torqued to spec

I didn't have any problems before I did all this.

Now, after driving about 2 or 3 miles above 30 mph, the front driver's side brake locks up and will smoke if I don't stop. If I pull over and wait 10 mins it will be fine for another 1 mile or so then drag and lock up.

I loosened up the bolts that connect MC to the Hydro and it doesn't help.

If I pump the brakes when cold, it doesn't lock up and moves freely.

The fluid flows normally and doesn't squirt when opening the bleeder when cold. I'd rather not open the bleeder when hot and get hot brake fluid burns, I haven't tested it when hot.

I have searched online for hours and am now at a loss. Anyone else experienced this?
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post #2 of 15 Old 09-12-2019, 05:23 PM
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Originally Posted by 7.3Carlos View Post
99.5 F250 4x4 248,500

New Hydroboost
New brake hose
New Calipers (Pins are well greased and move freely)
New Pads
Turned Rotors
Flushed the lines twice
Everything is torqued to spec

I didn't have any problems before I did all this.

Now, after driving about 2 or 3 miles above 30 mph, the front driver's side brake locks up and will smoke if I don't stop. If I pull over and wait 10 mins it will be fine for another 1 mile or so then drag and lock up.

I loosened up the bolts that connect MC to the Hydro and it doesn't help.

If I pump the brakes when cold, it doesn't lock up and moves freely.

The fluid flows normally and doesn't squirt when opening the bleeder when cold. I'd rather not open the bleeder when hot and get hot brake fluid burns, I haven't tested it when hot.

I have searched online for hours and am now at a loss. Anyone else experienced this?
Man your doing the same thing I am basically, only mine lock up and stay locked right away, I seem to have maybe solved the problem by getting new calipers but I still think something else is going on. The front locks up on both sides at the same time. Well see.

What hydroboost did you buy, was yours leaking?
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post #3 of 15 Old 09-12-2019, 06:01 PM Thread Starter
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I got my hydro from O'Reillys. It's a Brakebest Reman. It had decent reviews. Part #52-7357

It was leaking from the pushrod inside the cab.

When did your brakes start locking? Pre or post brake job?
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post #4 of 15 Old 09-12-2019, 10:22 PM
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I got my hydro from O'Reillys. It's a Brakebest Reman. It had decent reviews. Part #52-7357

It was leaking from the pushrod inside the cab.

When did your brakes start locking? Pre or post brake job?
They just started locking up out of no where, both front sides so now im tearing everything apart, it could use new stuff in the front anyway but i was trying to wait out a little longer, I dont drive it very much. also ordered a new MC since its the original.
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post #5 of 15 Old 09-13-2019, 07:48 AM
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This is why it's best to not do a bunch of changes at one time
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post #6 of 15 Old 09-13-2019, 08:51 AM
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Originally Posted by 7.3Carlos View Post
I loosened up the bolts that connect MC to the Hydro and it doesn't help.
Crack the fluid line to the Fronts and see if it releases the calipers. I would think this might be a bad Master that's not allowing fluid to return. The flushing could have dislodged something that's making an internal seal stick...
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post #7 of 15 Old 09-13-2019, 12:06 PM Thread Starter
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I changed the caliper that was locking up with a new one and it still locked up.

When it was locked up, I cracked the bleeder and it shot out and moved freely again. It does seem like fluid is not returning even though the hoses are new. I am about to go pick up a master cylinder. Hopefully, I will be able to drive it farther than 2 miles soon.

And I agree. Changing out a bunch of new parts at once makes it difficult to diagnose.
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post #8 of 15 Old 09-13-2019, 01:55 PM
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Originally Posted by 7.3Carlos View Post
I changed the caliper that was locking up with a new one and it still locked up.

When it was locked up, I cracked the bleeder and it shot out and moved freely again. It does seem like fluid is not returning even though the hoses are new. I am about to go pick up a master cylinder. Hopefully, I will be able to drive it farther than 2 miles soon.

And I agree. Changing out a bunch of new parts at once makes it difficult to diagnose.
Good luck, mine is coming in the mail from rockauto tomorrow.
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post #9 of 15 Old 09-14-2019, 05:42 AM

 
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New master cylinder will more than likely fix the issue.

[SIZE="3"]For all your ford powerstroke needs. If you dont see what you are looking for on the website, please use the contact page and shoot us a message or
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Part numbers will help alot too if they are not on our site.
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post #10 of 15 Old 09-14-2019, 11:12 AM Thread Starter
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Put in a new master cylinder. It helped a little bit .... kinda.

They are still dragging to the point of stopping with my foot off the brake after 4 miles instead of 2 miles.... I cracked the bleeder on the front driver's caliper when it locked and it shot out again and moved freely. It seems to be the problem child.

Now the list is

New mastercylinder
New Hydroboost
New brake hose
New Calipers (Pins are well greased and move freely)
New Pads
Turned Rotors
Flushed the lines twice
Everything is torqued to spec

If anyone has any ideas, please let me know. I don't know what is next.
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