One caliper not funtioning

[ahhhr]

Rotating the tires today and realized the passenger rear caliper Is not engaging. Rust on the rotor.
Maybe something for you guys to watch for.

Drivers side

Passenger side - the marks on the rotor happened when I put the parking brake on in the shop

 

[1FastHemi]

Good thing you weren't pulling a heavy trailer or need to do a panic stop.

 

[litzdog911]

What year/model truck?

 

[ahhhr]

What year/model truck?

Thanks for reminding me to put that in my signature
Stupid spell checker keeps wanting to caliper to caliber. Truck site doesn't know what a caliper is?

I started the engine and let the wheels spin a bit while the truck was in air. Engaged the brakes enough to stop the tire spinning. Now that caliper is working.
Thinking maybe when I crammed the parking brake down in the shop, I broke the caliper lose.

Service the brakes - maybe ? Overkill?

 

[Burn'n Oil]

I'd be tempted to take that caliper off and check for seized stuff and the integrity of the piston's dust boot. I've seen them torn on new vehicles.

 

[ahhhr]

I'd be tempted to take that caliper off and check for seized stuff and the integrity of the piston's dust boot. I've seen them torn on new vehicles.

Yeah - good call. I was thinking I should at least make sure the pin move freely.

 

[Great White North Eh]

I have had two vehicles with calipers fail. New 12 3500 and a low mile Jeep. They both would lock up and not release. Took the 12 back to the dealer with the rotor cooking and brought the clueless service counter monkey out and showed them the difference on each side with the heat gun. Should of told her to stick her fingers in there for a test Anyhow tech disassembled and said sliders we’re dry and a little rusted (duh it’s Alberta they are like that 10 min after driving away from dealer) so they charged me for new sliders and patted them selves on the back. It didn’t last and would lock up periodically until I finally replaced the rotor and calliper myself. New parts fail but u go to dealer and they roll their eyes and say they are ‘’NEW” parts

 

[ahhhr]

I disassembled it.
Pins are lubricated and slide well
Pads move as well as can be expected.
Caliper manually retracts very smoothly.
All rubber components are intact

I started the truck and applied brakes with callipers removed. I expected that to fully extend the callipers but it didn't. Both sides. Seems off to me but Im not a brake expert so maybe thats normal.

Guess I'll take this to the dealer so I have it on record. Also need to get the latest software updates.

 

[ahhhr]

Came back from a drive and measured the rotor temps.
Fronts were 174 and 168
Rears were 77 and 78.

Id be curious to what other members temps are after a drive.
Any other ideas on how I can determine whether the rear brakes are applying the correct amount of braking power?

 

[Great White North Eh]

The heat gun method works pretty well. At least you know one side is not over/under working the other. I guess the good old days are gone when you could lock up the brakes a little on a gravel road and see which corners were working and when.

 

[Burn'n Oil]

It appears at least that the rear binders are working equally - for now. Gotta wonder now if the brake system was bled properly during vehicle assy.

 

[RamCares]

I disassembled it.
Pins are lubricated and slide well
Pads move as well as can be expected.
Caliper manually retracts very smoothly.
All rubber components are intact

I started the truck and applied brakes with callipers removed. I expected that to fully extend the callipers but it didn't. Both sides. Seems off to me but Im not a brake expert so maybe thats normal.

Guess I'll take this to the dealer so I have it on record. Also need to get the latest software updates.

Hi ahhhr,

If you are in need of any additional support while working with your dealer, please do not hesitate to follow up with us via PM!

Mark
RamCares

 

[ahhhr]

Thanks @RamCares
Getting the dealer touch my truck is a last resort.
I'll let you know if it gets to that. Even if it does - probably won't need your assistance - but thanks for the offer.

 

[ahhhr]

It appears at least that the rear binders are working equally - for now. Gotta wonder now if the brake system was bled properly during vehicle assy.

You might be right. They do feel a bit squishy. Thought it might be the nature of this truck.
I do like the clips on the brake pads. Better design than most that I've worked on.
If bleeding them doesn't help - I might have to let the dealer touch it when I get my software updates.

 

[RamCares]

Thanks @RamCares
Getting the dealer touch my truck is a last resort.
I'll let you know if it gets to that. Even if it does - probably won't need your assistance - but thanks for the offer.

Thank you for taking the time to follow up, I completely understand your sentiments. We are always here if needed.

Mark
RamCares