Front brakes locking up!!!!!

[brasil]

had the same problem with my rear calipers... took em off the bracket. cleaned the sliding area where the brake pad sits. Then I pulled the pins out ( where the bolts go in ) cleaned everything with brake cleaner and
after that I used ceramic spray on these bolts. So they can slide very very easily now.
Result : works like a dream now

 

[mossy oak]

Thank you for the tip and feedback. I'll get around to it but I have been wide open today and been more concerned with my battery drain issue

 

[mossy oak]

Ok so...got my parasitic drain figured out. I need some help big time on this. Was tickled to have that fixed so took off for work in it! Brakes went to floor before ever grabbing. Had to pump and then I slammed on brakes and they locked up. Not losing fluid i don't think. Haven't noticed but the brakes are soft until I pump then they are right for a while and may be soft or like they should be for several more cycles. When I hopped in after it sat tho, before I cranked they went to the floorboard and the brake lights came on finally. This is driving me insane and gonna get me killed lol

 

[iamdub]

Sounds like low fluid and lots of air in the system, which would mean a leak somewhere.

 

[mossy oak]

I didn't see any leak but I most certainly appreciate it. I would lean towards the calipers sticking but when the pedal went to the floor, If it was the calipers, it would have built pressure and felt stiff

 

[iamdub]

I'd still try new brake hoses. Soft ones can expand, making the pedal feel soft. If you apply a lot of pressure, they'll balloon out but then shrink back when you let off the pedal, acting like a one-way valve and keeping the pressure in the calipers which will make them lock up. So- light/normal pressure feels soft, hard pressure makes them lock. Hoses are a cheap and easy swap. Flush all the old fluid out at the back brakes while you're bleeding it.

 

[mossy oak]

Ok here's where I'm at! I've bled brakes and don't have much pedal at all. Still same condition. I have hydroboost so do y'all reckon it's a boost problem? I don't see leaks but at the firewall where brake linkage enters from cab, there's residue from fluid. It wasn't fresh it didn't seem like. I've tried to push brakes several times with truck off then crank it and the pedal stays the same. I don't know what to do now

 

[rockola1971]

Have you had to add any brake fluid to the reservoir? (other than when you were bleeding the system)? The residue up at the firewall points to a bad master cylinder and so do some of your symptoms. At this point I dont believe its your hydroboost.

 

[mossy oak]

Yah k you rockola! I haven't had to add fluid yet but from my research I'm beginning to agree. I will change the master cylinder today but I am unclear how to properly bleed. I have searched and it gives me the bench bleed method so I can do that but wouldn't I introduce air past the master cylinder once I disconnect lines at MC? So can I just do the traditional pressure bleed at each wheel afterwards or is there something more?

 

[mossy oak]

Well shoot! Parts house didn't have one in stock. Guess I'll order one and get to it some time