Caliper Fluid Bolt

[DBoudreaux]

I have a 2008 4500 CC. Replacing driver caliper, when I try and screw in new brake fluid line bolt into the new caliper it will turn 2-3 threads then stops. Both new bolt and old bolt screw in old caliper just fine. I also ran a tap thru new caliper and tap went in with no problems using only fingers to run tap thru.

My only thought now is that the bolt might be tapered some to act like a self locking bolt? Just cautious on running bolt into caliper without hearing feed back from yall. Has anyone experienced this same situation?

 

[Hoefler]

Wrong bolt, different thread count and/or pitch.

 

[BigPapa]

Agreed. Wrong banjo bolt or wrong caliper.

 

[mwilson]

Does your old bolt fit the new caliper?? I can't see where you tried that..

If it won't then the caliper is wrong or defective. I see you have a 4500 and everything about that 4500 and 5500 is totally different underneath from its smaller brothers. A lot of parts are not even available aftermarket for that series of truck so I am suspicious of the caliper being right...

 

[DBoudreaux]

UPDATE** **Bad Caliper Thread** Brought caliper back to parts store, they had another one in stock. Tried bolt and it worked perfectly.

mwilson-- I did try both bolts in new and old. Both fit in old, neither in old. Thats why I wanted to check if maybe caliper threads may have been tapered for self locking reasons like on aircraft and even on a GMC 1500 control arms I have.

Thanks to all that responded, very much appreciated.

 

[DBoudreaux]

2nd UPDATE** Well the brake goblins strike again! lol. Put new Caliper bracket and caliper on. Applied brakes, bled air out of lines but caliper wont release. Fluid comes out of bleeder valve and fluid line when I back of banjo bolt. The brake line is original, so I will change it out. I read on here a while back that the line can fail on the inside acting as a check valve. Off to the parts house I go!

 

[GrantP]

So let's start from the beginning, why are you replacing the caliper in the first place? I'm guessing a new hose isn't going to fix your issue.

 

[DBoudreaux]

I changed caliper because it wasn’t releasing completly.

 

[mwilson]

I've seen a bad hose do that before.

 

[DBoudreaux]

When using c-clamp to press pistons back in, it takes little effort to compress pistons. Doesn’t seem like pistons are sticking or defective. Also, with new calipers, when I drained fluid from caliper, didn’t release until I loosened bolts from bracket to take caliper off.