Front discs won’t release

[Scotty D]

Need some help, I went through my brakes a couple of years ago- new master cylinder, calipers, pads, rotors, hoses, proportioning valve. Everything was working great, went to drive it the other day and it didn’t seem to roll like normal (I don’t drive it much as I like)
Found both front brakes hot and locked up after a 5 mile drive.
I cracked the lines on the master (thinking it was stuck but no pressure coming back to the master)
I can’t believe that both calipers are bad, or both hoses are collapsing after about 4 years time
Any ideas?

 

[Edelbrock]

Need some help, I went through my brakes a couple of years ago- new master cylinder, calipers, pads, rotors, hoses, proportioning valve. Everything was working great, went to drive it the other day and it didn’t seem to roll like normal (I don’t drive it much as I like)
Found both front brakes hot and locked up after a 5 mile drive.
I cracked the lines on the master (thinking it was stuck but no pressure coming back to the master)
I can’t believe that both calipers are bad, or both hoses are collapsing after about 4 years time
Any ideas?

Try lubing the caliper pins. Get them locked up again and try cracking open the bleeders on the calipers to see if they release.

 

[Scotty D]

I finally got my brake problem solved- the proportioning valve was stuck and would not reset.
Replaced it and good as new, tore the old one apart and found it full of corrosion. Not sure why, was all new fluid when I replaced the valve, calipers, hoses and wheel cylinders a couple years ago.

 

[Edelbrock]

I finally got my brake problem solved- the proportioning valve was stuck and would not reset.
Replaced it and good as new, tore the old one apart and found it full of corrosion. Not sure why, was all new fluid when I replaced the valve, calipers, hoses and wheel cylinders a couple years ago.

Thanks for the update. We have been wondering what the outcome was.

 

[hey mister]

I was getting ready to write P valve.
I seen an episode on Road Kill and the valve was bad.

Glad you found it.

 

[fast 99]

Amazes me how many proportioning valve are replaced on this forum. Obviously this vehicle needed a replacement. Bet in my entire life as a tech, replaced less than 5. These vehicles getting older might explain it.

 

[Goldie Driver]

Glad you found it. I had a master cylinder fail on Goldie and fronts would lock, but you could wiggle the pedal and ultimately free it up. I have never had one fail like that-usually it is that pucker inspiring foot to the floor pedal operation.

Hopefully your replacement does well for you.

 

[TotalyHucked]

My brake light has been on for the last 2-3 months like my E-brake is engaged but it's not, the pedal isn't hanging or anything. I'm just assuming it's something in the prop valve, hoping it doesn't fail in either of those spectacular fashions lol

 

[Sad Sack]

I finally got my brake problem solved- the proportioning valve was stuck and would not reset.
Replaced it and good as new, tore the old one apart and found it full of corrosion. Not sure why, was all new fluid when I replaced the valve, calipers, hoses and wheel cylinders a couple years ago.

Never hurts to flush brake system frequently, the older the fluid is, the more moisture it contains hence the corrosion.

 

[hey mister]

My brake light has been on for the last 2-3 months like my E-brake is engaged but it's not, the pedal isn't hanging or anything. I'm just assuming it's something in the prop valve, hoping it doesn't fail in either of those spectacular fashions lol

Could be just an old switch

 

[HotWheelsBurban]

My brake light has been on for the last 2-3 months like my E-brake is engaged but it's not, the pedal isn't hanging or anything. I'm just assuming it's something in the prop valve, hoping it doesn't fail in either of those spectacular fashions lol

Someone else on here had a bad/stuck proportion valve, maybe that's it? I'd check the switch too, those are definitely failure points after 40-50 years....

 

[bucket]

Amazes me how many proportioning valve are replaced on this forum. Obviously this vehicle needed a replacement. Bet in my entire life as a tech, replaced less than 5. These vehicles getting older might explain it.

Yep. I can only remember replacing just one. It was a brown '80-ish Malibu.